MINISTRY OF THE INTERIOR
RUSSIAN FEDERATION

STATE FIRE SERVICE

FIRE SAFETY STANDARDS

FIRE PROTECTIVE COMPOSITIONS
FOR STEEL STRUCTURES

General requirements.
Method for determining fire retardant effectiveness

NPB 236-97

MOSCOW 1997

Developed by the Main Directorate of the State fire service(GUGPS) of the Ministry of Internal Affairs of Russia, the All-Russian Research Institute of Fire Defense (VNIIPO) of the Ministry of Internal Affairs of Russia.

Submitted and prepared for approval by the regulatory and technical department of the GUGPS of the Ministry of Internal Affairs of Russia.

Approved by the Chief State Inspector Russian Federation for fire supervision.

Agreed with the Ministry of Construction of Russia by letter No. 13-246 dated April 28, 1997.

They were put into effect by order of the GUGPS of the Ministry of Internal Affairs of Russia No. 25 dated April 29, 1997.

Date of entry into force 01.06.97

Introduced for the first time

Norms of the State Fire Service of the Ministry of Internal Affairs of Russia

Date of introduction 01.06.1997

1 AREA OF USE

These rules establish General requirements to flame retardants for steel structures, as well as a method for determining their fire-retardant effectiveness.

The standards do not apply to the determination of the fire resistance limits of structures with fire protection.

Compliance with the requirements of these standards is mandatory when developing regulatory and technical documentation for these fire protection equipment and during their certification.

GOST 30247.0-94 Building structures. Test methods for fire resistance. General requirements.

GOST 8239-89 Hot-rolled steel I-beams. Assortment.

GOST 26020-83 Hot-rolled steel I-beams with parallel flange edges. Assortment.

SNiP 11-01-95 Instructions on the procedure for the development, approval, approval and composition of project documentation for the construction of enterprises, buildings and structures.

GOST 16523-89 Rolled thin-sheet carbon steel of high quality and ordinary quality general purpose. Specifications.

3. TERMS AND DEFINITIONS

The following terms and definitions are used in these standards:

Fire retardant- a flame retardant composition or material that has fire retardant effectiveness and is specially designed for fire protection of various objects.

Flame retardant- a substance or mixture of substances with fire-retardant effectiveness and specially designed for fire protection of various objects.

Fire protection object- a material, structure or product that is treated with a fire retardant in order to reduce their fire hazard and/or increase fire resistance.

Fire retardant treatment- application of a flame retardant composition on the surface of the object of fire protection (painting, coating, spraying, etc.).

Structural methods of fire protection- cladding of a fire protection object with materials or other Constructive decisions for its fire protection.

Combined method - combinations various ways flame retardant treatment.

fire retardant coating- a layer of flame retardant composition obtained as a result of surface treatment of the object of fire protection.

Fire retardant efficiency- a comparative indicator of the fire protection means, which is characterized by the time in minutes from the start of the fire test to reaching critical temperature(500 °C) standard sample of a steel structure with a fire-retardant coating and is determined by the method set out in section 6 of these standards.

Reduced metal thickness- cross-sectional area ratio metal structure to the heated part of its perimeter.

Guaranteed shelf life (shelf life)- the time during which the fire retardant composition (its individual components) can be used for fire retardant treatment of the structure without reducing its fire retardant efficiency and warranty period of operation.

Warranty period of operation- the time during which the specified fire-retardant efficiency of the coating, operated in accordance with the technical documentation, is guaranteed.

4. GENERAL REQUIREMENTS

4.1. Flame retardants must be approved and agreed upon in in due course, must have technical documentation for their production and use, as well as a certificate fire safety.

4.2. The technical documentation must contain the following indicators and characteristics of flame retardants:

fire retardant efficiency group;

consumption for a certain fire-retardant efficiency group;

appearance;

information on application technology: surface preparation methods, types and grades of primers, adhesion, number of layers, drying conditions;

warranty period and storage conditions of the composition;

measures for safety and fire safety during the storage of compositions and the performance of work.

If necessary, the technical documentation should indicate information on the types and brands of paints and varnishes that are acceptable for application over the fire-retardant layer in order to protect it from the effects external environment or coating decorative properties.

In addition, the following information about the fire retardant coating should be indicated in the technical documentation:

thickness for a certain group of fire-retardant efficiency;

operating conditions (limit values of humidity, ambient temperature, etc.);

appearance;

bulk density;

warranty period of operation;

the possibility and frequency of replacement or restoration of the coating, depending on the operating conditions.

Production and supply of flame retardants, design and performance of works on fire protection of structures should be carried out by organizations licensed for this species activities.

The use of fire protection equipment must be carried out in accordance with the technical documentation and the project developed, agreed and approved in the manner established by SNiP 11-01.

The group of flame retardant effectiveness of flame retardants is determined in accordance with clause 6.5.3 of these standards.

Tests to determine the flame retardant effectiveness must be carried out in a specialized organization that has the appropriate accreditation.

Simultaneously with tests to determine the fire-retardant efficiency, control tests are carried out in accordance with Section 7 of these standards.

Fire-retardant coatings must be able to be restored after the warranty period.

It is not allowed to use fire-retardant coatings on objects of protection located in places that exclude the possibility of replacing or restoring (restoring) the coating.

When using flame retardants with coating surface protection paints and varnishes fire protection characteristics should be determined taking into account the surface layer.

The indicators and characteristics of fire retardant compositions and coatings, with the exception of the fire retardant efficiency group, are determined by the developer of the technical documentation, for which he bears the responsibility established by law.

With a scientific and technical justification, at the initiative of the customer, tests can be carried out according to an expanded program, the purpose of which will be to build a generalized dependence of the fire retardant effectiveness of a particular fire protection product on the reduced thickness of the metal and the thickness of the fire retardant coating.

Packaging, storage and transportation conditions of flame retardants must ensure their flame retardant properties during due date validity.

It is not allowed to use flame retardants on unprepared (or prepared in violation of the requirements of the technical documentation for these compositions) surfaces of protected objects.

5. CERTIFICATION OF FIRE-PROOF COATINGS

5.1. To obtain a fire safety certificate, the customer must submit to the certification body:

developed and duly approved technical documentation for the fire retardant composition;

test reports confirming the flame retardant effectiveness of the composition.

5.2. In the fire safety certificate for the flame retardant, except for general information established by the certificate form, the following special indicators and characteristics should be reflected:

name of the flame retardant;

fire retardant efficiency group;

types, grades, thicknesses of layers of ground, decorative or weather-resistant paint and varnish coatings used in combination with the specified fire protection agent during certification tests;

the thickness of the fire retardant coating and the consumption of the fire retardant composition for the established fire retardant efficiency group.

6. METHOD FOR DETERMINING FIRE PROTECTION EFFICIENCY

6.1 . Method Essence

The essence of the method is to determine, in accordance with these standards, the fire-retardant effectiveness of the coating during thermal exposure to a prototype and to determine the time from the start of thermal exposure to the onset of the limit state of this sample.

6.2 . Test equipment

6.2.1. Equipment includes:

installation for fire testing of small-sized samples of rod structures;

fixtures for setting the sample;

a system for measuring and recording parameters, including equipment for film, photo or video filming;

6.2.2. The main dimensions and installation diagram are shown in fig. 1 appendix A.

6.2.3. Requirements for the fuel supply and combustion system, systems for measuring and recording parameters, temperature conditions in the installation - in accordance with GOST 30247.0.

6.3 . Samples for testing

6.3.1. For testing, two identical samples are made.

6.3.2. As samples on which the fire retardant composition is applied, steel columns of an I-section section of profile No. 20 according to GOST 8239 or profile No. 20B1 according to GOST 26020 should be used. Sample height (1700 ± 10) mm. Reduced metal thickness steel column determined immediately before each test.

6.3.3. Flame retardants are applied to the samples in accordance with the technical documentation (cleaning the surface of steel samples, type of primer, amount and thickness of the applied layer, etc.) in the presence of specialists conducting tests.

Note. Before applying the flame retardant, its identification must be carried out. Experimental identification of the flame retardant composition is carried out using thermal analysis equipment.

6.3.4. The moisture content of the coating must be dynamically balanced with environment With relative humidity(60 ± 15)% at a temperature of (20 ± 10) °С.

6.3.5. When conducting certification tests, sampling must be carried out in accordance with the requirements of the certification procedure.

6.4 . Preparation and conduct of tests

6.4.1. Test conditions - according to GOST 30247.0.

6.4.2. Preparation for testing includes the placement of thermoelectric converters (TEC) in the furnace and on the sample, checking and debugging fuel supply and combustion systems, instruments, installation of a prototype in the furnace.

6.4.3. Before testing, it is necessary to make control measurements of the actual thicknesses of fire-retardant coatings. The measurement of the coating thickness is carried out at least at ten points along the perimeter of the heated surface of the I-beam, with a step of no more than 500 mm along the height of the sample. The result is taken as the arithmetic mean of all measurements. In this case, the standard deviation should be no more than 10% of the measurement result.

An estimate and an example of calculating the standard deviation of the measurement result are given in Appendix B.

Measurement accuracy at coating thickness:

up to 10 mm - 0.01 mm;

up to 20 mm - 0.05 mm;

up to 50 mm - 0.5 mm.

6.4.4. The temperature of the steel sample is measured using a TEC from a wire with a diameter of not more than 0.75 mm. TPEs on the sample are installed by caulking in the amount of three pieces: in the middle section of the sample on the I-beam wall and on the inner surfaces of the I-beam shelves. The layout of the TEP is shown in fig. 2 applications A.

6.4.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

6.4.6. During the testing process, the following indicators are recorded:

temperature change in the furnace in accordance with clause 6.4.1 of these standards;

temperature change of the prototype metal;

6.4.7. Tests are carried out without static load under four-sided thermal action until the limit state of the prototype occurs.

6.4.8. The achievement of the critical temperature of the steel of prototypes equal to 500 °C (averaged over three TECs) is taken as the limiting state.

6.5

6.5.1. The result of one test is taken as the time (in minutes) to reach the limit state of the prototype.

6.5.2. The fire retardant performance of a coating for steel structures is determined as the arithmetic mean of the test results of two specimens. At the same time, the maximum and minimum values test results of samples should not differ from each other by more than 20% (from the larger value). If the values of the test results differ from each other by more than 20%, an additional test must be carried out, and the fire retardant efficiency is determined as the arithmetic mean of the two lower values.

6.5.3. The fire-retardant effectiveness of the compositions is divided into 5 groups:

1st - at least 150 minutes;

2nd - at least 120 minutes;

3rd - at least 60 minutes;

4th - at least 45 minutes;

5th - at least 30 min.

When determining the group of fire-retardant effectiveness of the compositions, test results with indicators of less than 30 minutes are not considered.

7. CONTROL METHOD FOR TESTING FIRE RETARDANT COMPOSITIONS

7.1 . Method Essence

7.1.1. The control method for testing fire retardants is used to control the fire retardant effectiveness of fire retardants during their production, as well as for the supply of large batches of fire retardant coatings (based on the required mass of fire retardant coating per 1000 m 2 of the surface of a metal structure or more).

7.1.2. The essence of the method lies in the thermal effect on the prototype and the determination of the time from the beginning of the thermal effect to the onset of the limit state of the prototype.

7.2 . Samples for testing

7.2.1. For testing, one sample is made.

7.2.2. A steel plate with a size of 600x600x5 mm with a flame retardant applied to it is used as a sample. Tolerances the width and length of the steel plate should not exceed ±5 mm, and the thickness ±0.5 mm.

7.2.3. The unheated surface of the prototype should be thermally insulated with a material with a value thermal resistance not less than 1.9 m 2 · °С/W and not less than 100 mm thick.

7.2.4. Composition, thickness and technology of application of flame retardant composition, namely: method of application ( mechanized way or manually), the quality of the steel surface to be coated (unpainted cleaned surface or surface primed paint coatings), must be identical to the composition, thickness and application technology used in tests to evaluate the fire-retardant effectiveness of coatings for load-bearing steel structures.

7.3 . Testing

7.3.1. Test conditions - according to GOST 30247.0.

7.3.2. Tests are carried out on a facility for thermophysical research and testing of small-sized fragments of flat structures and individual nodes of their butt joints and fastenings. The main dimensions and installation diagram are shown in fig. 3 mandatory appendix A.

7.3.3. Requirements to test equipment and measuring instruments, temperature regime- according to GOST 30247.0.

7.3.4. The temperature on the surface of steel specimens is measured using thermoelectric probes made of wire with a diameter of not more than 0.75 mm, which are installed by caulking on the unheated surface of the specimens in the amount of three pieces. One of the TECs is installed in the center of the sample, and the other two - diagonally at a distance of (200 ± 5) mm from the center.

7.3.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

7.3.6. During the testing process, the following indicators are recorded:

the time of onset of the limiting state;

temperature change in the furnace;

behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

temperature change on the unheated surface of the prototype;

7.3.7. Tests are carried out until the limit state of the prototype.

7.3.8. The limiting state is taken as the time to reach a temperature of 500 °C for the steel of prototypes (average temperature over three TECs).

7.4 . Evaluation of test results

7.4.1. The result is the time to reach the limit state.

7.4.2. The results of subsequent tests should not differ from the test results of the control sample by more than 20% in the direction of reducing the time to reach the limit state.

7.5 . Test report

7.5.1. The test results are drawn up in the form of a protocol, which is an annex to the test report on the assessment of the fire retardant effectiveness of the fire retardant composition for load-bearing steel structures.

7.5.2. The protocol must contain:

name of the organization conducting the tests;

name of the customer organization;

date of manufacture of the flame retardant composition;

method of application and thickness of the coating;

name of the flame retardant, information about the manufacturer, trademark and marking of the flame retardant, indicating the technical documentation;

date of testing;

Name normative document on test methods;

visual observations during testing;

sketches and descriptions of tested samples, data on control measurements of the state of samples, operational properties coatings and a list of deviations made during the manufacture of the sample from the technical documents for the design;

recording of controlled parameters, the results of their processing and evaluation;

video or photographic materials;

conclusion about the group of fire-retardant coating efficiency;

duration of the protocol.

8. Safety

According to GOST 30247.0.

Annex A

Mandatory

Rice. one. Installation for fire testing of small-sized samples of bar structures:

1 - fire chamber; 2 - laying the furnace; 3 - heating channel of the nozzle; 4 - nozzle; 5 - smoke channel; 6- exhaust hood; 7 - arch of the furnace; 8 - test sample; 9 - air duct; 10 - thermocouple; 11 - viewing hatch

Rice. 2. Scheme of arrangement of thermoelectric converters in the middle section on the surface of the prototype:

1 - I-beam No. 20; 2 - fire-retardant coating; 3 - thermoelectric converters

Rice. 3. Installation for thermophysical research and testing of small-sized fragments of flat structures and individual nodes of their butt mates and fastenings:

1 - smoke channel; 2 - laying the furnace; 3 - fire chamber; 4 - collapsible part of the masonry; 5 - TEP; 6 - nozzle heating channel; 7 - nozzle; 8 - test sample; 9 - insert

Annex B

Mandatory

Estimation of the standard deviation of the measurement result

1. Estimation of the standard deviation

Fire safety standards NPB 236-97
"Fire retardants for steel structures. General requirements. Method for determining fire retardant effectiveness"
(put into effect by order of the GUGPS of the Ministry of Internal Affairs of the Russian Federation of April 29, 1997 N 25)

Fire retardant composition for steel constructions. General requirement. Method for determining fire retardant efficiency

Introduced for the first time

1 area of use

These standards establish general requirements for fire retardants for steel structures, as well as a method for determining their fire retardant effectiveness.

The standards do not apply to the determination of the fire resistance limits of structures with fire protection.

Compliance with the requirements of these standards is mandatory when developing regulatory and technical documentation for these fire protection equipment and during their certification.

GOST 30247.0-94 "Building structures. Fire resistance test methods. General requirements". GOST 8239-89 "Hot-rolled steel I-beams. Assortment". SNiP 11-01-95 "Instruction on the procedure for the development, approval, approval and composition of project documentation for the construction of enterprises, buildings and structures." GOST 16523-89 "Rolled sheet of carbon steel of high quality and ordinary quality for general purposes. Specifications".

3. Terms and definitions

The following terms and definitions are used in these standards:

Fire retardant- a flame retardant composition or material that has fire retardant effectiveness and is specially designed for fire protection of various objects.

Flame retardant- a substance or mixture of substances with fire-retardant effectiveness and specially designed for fire protection of various objects.

Fire protection object- a material, structure or product treated with a fire protection agent in order to reduce their fire hazard and (or) increase fire resistance.

Fire retardant treatment- application of a flame retardant composition on the surface of the object of fire protection (painting, coating, spraying, etc.).

Structural methods of fire protection- lining the fire protection object with materials or other design solutions for its fire protection.

Combined method- combinations of various methods of fire-retardant treatment.

fire retardant coating- a layer of flame retardant composition obtained as a result of surface treatment of the object of fire protection.

Fire retardant efficiency- a comparative indicator of the fire protection agent, which is characterized by the time in minutes from the start of the fire test to reaching the critical temperature (500 ° C) of a standard sample of a steel structure with a fire retardant coating and is determined by the method described in Section 6 of these standards.

Reduced metal thickness- the ratio of the cross-sectional area of the metal structure to the heated part of its perimeter.

Guaranteed shelf life (shelf life)- the time during which the fire retardant composition (its individual components) can be used for fire retardant treatment of the structure without reducing its fire retardant efficiency and warranty period of operation.

Warranty period of operation- the time during which the specified fire-retardant efficiency of the coating, operated in accordance with the technical documentation, is guaranteed.

4. General requirements

Consumption for a certain fire-retardant efficiency group;

Appearance;

Information on application technology: surface preparation methods, types and grades of primers, adhesion, number of layers, drying conditions;

Thickness for a certain group of fire-retardant efficiency;

Operating conditions (limit values of humidity, ambient temperature, etc.);

Appearance;

The possibility and frequency of replacement or restoration of the coating, depending on the operating conditions.

4.6. Tests to determine the flame retardant effectiveness must be carried out in a specialized organization that has the appropriate accreditation.

4.7. Simultaneously with tests to determine the fire-retardant efficiency, control tests are carried out in accordance with Section 7 of these standards.

4.8. Fire-retardant coatings must be able to be restored after the warranty period.

5. Certification of fire retardant coatings

5.1. To obtain a fire safety certificate, the customer must submit to the certification body:

Developed and duly approved technical documentation for the fire retardant composition;

Test reports confirming the flame retardant effectiveness of the composition.

5.2. In addition to the general information established by the certificate form, the fire safety certificate for a flame retardant must contain the following special indicators and characteristics:

The name of the flame retardant;

Fire retardant efficiency group;

Types, brands, thickness of layers of ground, decorative or weather-resistant paint coatings used in combination with the specified fire protection agent during certification tests;

6. Method for determining fire retardant efficiency

6.1. Method Essence

The essence of the method is to determine the fire-retardant efficiency of the coating under thermal exposure to a prototype and to determine the time from the onset of thermal exposure to the onset of the limit state of this sample in accordance with these standards.

6.2. Test Equipment

6.2.1. Equipment includes:

Installation for fire testing of small-sized samples of rod structures;

Devices for setting the sample;

A system for measuring and recording parameters, including equipment for film, photo or video filming.

6.2.3. Requirements for the fuel supply and combustion system, systems for measuring and recording parameters, temperature conditions in the installation - in accordance with GOST 30247.0.

6.3. Samples for testing

6.3.1. For testing, two identical samples are made.

6.3.3. Flame retardants are applied to the samples in accordance with the technical documentation (surface cleaning of steel samples, type of primer, amount and thickness of the applied layer, etc.).

NOTE Prior to application of a fire retardant coating, its identification must be carried out. Experimental identification of the fire-retardant coating is carried out using thermal analysis equipment.

6.3.4. The humidity of the coating must be dynamically balanced with the environment with a relative humidity of 60 + - 15% at a temperature of 20 + - 10°C.

6.3.5. When conducting certification tests, sampling must be carried out in accordance with the requirements of the certification procedure.

6.4. Preparation and conduct of tests

6.4.3. Before testing, it is necessary to make control measurements of the actual thickness of fire-retardant coatings. The measurement of the coating thickness is carried out at least in five places on each heated surface of the shelves and walls of the I-beam. The result is taken as the arithmetic mean of all measurements.

Measurement accuracy at coating thickness:

Up to 10 mm - 0.01 mm;

Up to 20 mm - 0.05 mm;

Up to 50 mm - 0.5 mm.

6.4.4. The temperature of the steel sample is measured using a TEC from a wire with a diameter of not more than 0.75 mm. TEC on the sample is installed by caulking in the amount of 3 pieces: in the middle section of the sample on the wall of the I-beam and on the inner surfaces of the shelves of the I-beam. The layout of the TEP is shown in Figure 2 of mandatory Appendix A.

6.4.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

6.4.6. During the testing process, the following indicators are recorded:

Temperature change in the furnace in accordance with paragraph 6.4.1 of these standards;

Behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

Change in the temperature of the metal of the prototype.

6.4.7. Tests are carried out without static load under four-sided thermal action until the limit state of the prototype occurs.

6.4.8. The achievement of the critical temperature of steel of prototypes equal to 500°C (averaged over three TECs) is taken as the limiting state.

6.5. Evaluation of test results

6.5.1. The test result is the time (in minutes) to reach the limit state of the prototype.

6.5.2. The fire retardant performance of a coating for steel structures is determined as the arithmetic mean of the test results of two specimens. In this case, the maximum and minimum values of the test results of the samples should not differ from each other by more than 20% (greater value). If the values of the test results differ from each other by more than 20%, an additional test must be carried out, and the fire retardant efficiency is determined as the arithmetic mean of the two lower values.

6.5.3. The fire-retardant effectiveness of the compositions is divided into 5 groups: 1st group - at least 150 minutes; 2nd - at least 120; 3rd - at least 60; 4th - at least 45; 5th - at least 30.

When determining the group of fire-retardant effectiveness of the compositions, test results with indicators of less than 30 minutes are not considered.

7. Control method for testing flame retardants

7.1. Method Essence

7.2. Samples for testing

7.2.1. For testing, one sample is made.

7.2.2. As a sample, a steel plate measuring 600x600x5 mm is used, with a flame retardant applied to it. Permissible deviations in the width and length of the steel plate should not exceed + - 5 mm, and in thickness - + - 0.5 mm.

7.2.3. The unheated surface of the prototype must be thermally insulated with a material with a thermal resistance value of at least 1.9 m2 x °C/W and a thickness of at least 100 mm.

7.2.4. The composition, thickness and technology of applying the flame retardant, namely: the method of application (mechanized or manually), the quality of the steel surface to be coated (unpainted cleaned surface or the surface primed with paint coatings) must be identical to the composition, thickness and application technology used in tests to evaluate fire retardant effectiveness

7.3.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located at the specified locations.

7.3.6. During the testing process, the following indicators are recorded:

Time of onset of the limit state;

Temperature change in the furnace;

Behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

Temperature change on the unheated surface of the prototype.

7.3.7. Tests are carried out until the limit state of the prototype.

7.3.8. The limit state is taken as the time to reach a temperature of 500°C for the steel of prototypes (average temperature over three TECs).

7.4. Evaluation of test results - application method and coating thickness;

Name of the flame retardant, information about the manufacturer, trademark and marking of the flame retardant, indicating the technical documentation;

date of testing;

Name of the normative document for test methods;

Visual observations during testing;

Sketches and description of the tested samples, data on control measurements of the condition of the samples, operational properties of coatings and a list of deviations made during the manufacture of the sample from technical documents for the design;

Recording of controlled parameters, the results of their processing and evaluation;

Video or photographic materials;

Conclusion on the group of fire-retardant effectiveness of the coating;

The duration of the protocol.

MINISTRY OF THE INTERIOR
RUSSIAN FEDERATION

STATE FIRE SERVICE

FIRE SAFETY STANDARDS

FIRE PROTECTIVE COMPOSITIONS
FOR STEEL STRUCTURES

General requirements.
Method for determining fire retardant effectiveness

NPB 236-97

MOSCOW 1997

Developed by the Main Directorate of the State Fire Service (GUGPS) of the Ministry of Internal Affairs of Russia, the All-Russian Research Institute of Fire Defense (VNIIPO) of the Ministry of Internal Affairs of Russia.

Submitted and prepared for approval by the regulatory and technical department of the GUGPS of the Ministry of Internal Affairs of Russia.

Approved by the chief state inspector of the Russian Federation for fire supervision.

Agreed with the Ministry of Construction of Russia by letter No. 13-246 dated April 28, 1997.

They were put into effect by order of the GUGPS of the Ministry of Internal Affairs of Russia No. 25 dated April 29, 1997.

Date of entry into force 01.06.97

Introduced for the first time

Norms of the State Fire Service of the Ministry of Internal Affairs of Russia

Date of introduction 01.06.1997

1 AREA OF USE

These rules establish general requirements for fire retardant compositions for steel structures, as well as a method for determining their fire retardant effectiveness.

The standards do not apply to the determination of the fire resistance limits of structures with fire protection.

Compliance with the requirements of these standards is mandatory when developing regulatory and technical documentation for these fire protection equipment and during their certification.

GOST 30247.0-94 Building structures. Test methods for fire resistance. General requirements.

GOST 8239-89 Hot-rolled steel I-beams. Assortment.

GOST 26020-83 Hot-rolled steel I-beams with parallel flange edges. Assortment.

SNiP 11-01-95 Instructions on the procedure for the development, approval, approval and composition of project documentation for the construction of enterprises, buildings and structures.

GOST 16523-89 Rolled thin-sheet carbon steel of high quality and ordinary quality for general purposes. Specifications.

3. TERMS AND DEFINITIONS

The following terms and definitions are used in these standards:

Fire retardant- a flame retardant composition or material that has fire retardant effectiveness and is specially designed for fire protection of various objects.

Flame retardant- a substance or mixture of substances with fire-retardant effectiveness and specially designed for fire protection of various objects.

Fire protection object- a material, structure or product treated with a fire protection agent in order to reduce their fire hazard and (or) increase fire resistance.

Fire retardant treatment- application of a flame retardant composition on the surface of the object of fire protection (painting, coating, spraying, etc.).

Structural methods of fire protection- lining the fire protection object with materials or other design solutions for its fire protection.

Combined method- combinations of various methods of fire-retardant treatment.

fire retardant coating- a layer of flame retardant composition obtained as a result of surface treatment of the object of fire protection.

Fire retardant efficiency- a comparative indicator of the fire protection agent, which is characterized by the time in minutes from the start of the fire test to reaching the critical temperature (500 ° C) of a standard sample of a steel structure with a fire retardant coating and is determined by the method described in section 6 of these standards.

Reduced metal thickness- the ratio of the cross-sectional area of the metal structure to the heated part of its perimeter.

Warranty period of operation- the time during which the specified fire-retardant efficiency of the coating, operated in accordance with the technical documentation, is guaranteed.

4. GENERAL REQUIREMENTS

4.1. Flame retardants must be approved and agreed upon in the prescribed manner, must have technical documentation for their production and use, as well as a fire safety certificate.

4.2. The technical documentation must contain the following indicators and characteristics of flame retardants:

fire retardant efficiency group;

consumption for a certain fire-retardant efficiency group;

appearance;

information on application technology: surface preparation methods, types and grades of primers, adhesion, number of layers, drying conditions;

warranty period and storage conditions of the composition;

measures for safety and fire safety during the storage of compositions and the performance of work.

If necessary, the technical documentation should indicate information on the types and brands of paints and varnishes that are acceptable for application over the fire-retardant layer in order to protect it from environmental influences or to give the coating decorative properties.

In addition, the following information about the fire retardant coating should be indicated in the technical documentation:

thickness for a certain group of fire-retardant efficiency;

operating conditions (limit values of humidity, ambient temperature, etc.);

appearance;

bulk weight;

warranty period of operation;

the possibility and frequency of replacement or restoration of the coating, depending on the operating conditions.

Production and supply of flame retardants, design and performance of works on fire protection of structures should be carried out by organizations licensed for this type of activity.

The use of fire protection equipment must be carried out in accordance with the technical documentation and the project developed, agreed and approved in the manner established by SNiP 11-01.

The group of flame retardant effectiveness of flame retardants is determined in accordance with clause 6.5.3 of these standards.

Tests to determine the flame retardant effectiveness must be carried out in a specialized organization that has the appropriate accreditation.

Simultaneously with tests to determine the fire-retardant efficiency, control tests are carried out in accordance with Section 7 of these standards.

Fire-retardant coatings must be able to be restored after the warranty period.

It is not allowed to use fire-retardant coatings on objects of protection located in places that exclude the possibility of replacing or restoring (restoring) the coating.

When using flame retardants with protection of the coating surface with paints and varnishes, the fire retardant characteristics should be determined taking into account the surface layer.

Packaging, storage and transportation conditions of flame retardants must ensure their fire retardant properties during the specified shelf life.

It is not allowed to use flame retardants on unprepared (or prepared in violation of the requirements of the technical documentation for these compositions) surfaces of protected objects.

5. CERTIFICATION OF FIRE-PROOF COATINGS

5.1. To obtain a fire safety certificate, the customer must submit to the certification body:

developed and duly approved technical documentation for the fire retardant composition;

test reports confirming the flame retardant effectiveness of the composition.

5.2. In addition to the general information established by the certificate form, the fire safety certificate for a flame retardant must contain the following special indicators and characteristics:

name of the flame retardant;

fire retardant efficiency group;

types, grades, thicknesses of layers of ground, decorative or weather-resistant paint and varnish coatings used in combination with the specified fire protection agent during certification tests;

the thickness of the fire retardant coating and the consumption of the fire retardant composition for the established fire retardant efficiency group.

6. METHOD FOR DETERMINING FIRE PROTECTION EFFICIENCY

6.1 . Method Essence

6.2 . Test equipment

6.2.1. Equipment includes:

installation for fire testing of small-sized samples of rod structures;

fixtures for setting the sample;

a system for measuring and recording parameters, including equipment for film, photo or video filming;

6.2.2. The main dimensions and installation diagram are shown in fig. 1 appendix A.

6.2.3. Requirements for the fuel supply and combustion system, systems for measuring and recording parameters, temperature conditions in the installation - in accordance with GOST 30247.0.

6.3 . Samples for testing

6.3.1. For testing, two identical samples are made.

6.3.2. As samples on which the fire retardant composition is applied, steel columns of an I-section section of profile No. 20 according to GOST 8239 or profile No. 20B1 according to GOST 26020 should be used. Sample height (1700 ± 10) mm. The reduced metal thickness of the steel column is determined immediately before each test.

Note. Before applying the flame retardant, its identification must be carried out. Experimental identification of the flame retardant composition is carried out using thermal analysis equipment.

6.3.4. The humidity of the coating must be dynamically balanced with the environment with a relative humidity of (60 ± 15)% at a temperature of (20 ± 10) °C.

6.3.5. When conducting certification tests, sampling must be carried out in accordance with the requirements of the certification procedure.

6.4 . Preparation and conduct of tests

6.4.1. Test conditions - according to GOST 30247.0.

An estimate and an example of calculating the standard deviation of the measurement result are given in Appendix B.

Measurement accuracy at coating thickness:

up to 10 mm - 0.01 mm;

up to 20 mm - 0.05 mm;

up to 50 mm - 0.5 mm.

6.4.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

6.4.6. During the testing process, the following indicators are recorded:

temperature change in the furnace in accordance with clause 6.4.1 of these standards;

temperature change of the prototype metal;

6.4.7. Tests are carried out without static load under four-sided thermal action until the limit state of the prototype occurs.

6.4.8. The achievement of the critical temperature of the steel of prototypes equal to 500 °C (averaged over three TECs) is taken as the limiting state.

6.5

6.5.1. The result of one test is taken as the time (in minutes) to reach the limit state of the prototype.

6.5.2. The fire retardant performance of a coating for steel structures is determined as the arithmetic mean of the test results of two specimens. In this case, the maximum and minimum values of the test results of the samples should not differ from each other by more than 20% (from the larger value). If the values of the test results differ from each other by more than 20%, an additional test must be carried out, and the fire retardant efficiency is determined as the arithmetic mean of the two lower values.

6.5.3. The fire-retardant effectiveness of the compositions is divided into 5 groups:

1st - at least 150 minutes;

2nd - at least 120 minutes;

3rd - at least 60 minutes;

4th - at least 45 minutes;

5th - at least 30 min.

When determining the group of fire-retardant effectiveness of the compositions, test results with indicators of less than 30 minutes are not considered.

7. CONTROL METHOD FOR TESTING FIRE RETARDANT COMPOSITIONS

7.1 . Method Essence

7.2 . Samples for testing

7.2.1. For testing, one sample is made.

7.2.2. A steel plate with a size of 600x600x5 mm with a flame retardant applied to it is used as a sample. Permissible deviations in the width and length of the steel plate should not exceed ±5 mm, and in thickness ±0.5 mm.

7.2.3. The unheated surface of the prototype must be thermally insulated with a material with a thermal resistance value of at least 1.9 m 2 °C / W and a thickness of at least 100 mm.

7.2.4. The composition, thickness and technology of applying the flame retardant, namely: the method of application (mechanized or manually), the quality of the steel surface on which the coating is applied (unpainted cleaned surface or the surface primed with paint and varnish coatings), must be identical to the composition, thickness and application technology, used in tests to evaluate the fire retardant effectiveness of coatings for load-bearing steel structures.

7.3 . Testing

7.3.1. Test conditions - according to GOST 30247.0.

7.3.3. Requirements for test equipment and measuring instruments, temperature conditions - in accordance with GOST 30247.0.

7.3.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

7.3.6. During the testing process, the following indicators are recorded:

the time of onset of the limiting state;

temperature change in the furnace;

behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

temperature change on the unheated surface of the prototype;

7.3.7. Tests are carried out until the limit state of the prototype.

7.3.8. The limiting state is taken as the time to reach a temperature of 500 °C for the steel of prototypes (average temperature over three TECs).

7.4 . Evaluation of test results

7.4.1. The result is the time to reach the limit state.

7.4.2. The results of subsequent tests should not differ from the test results of the control sample by more than 20% in the direction of reducing the time to reach the limit state.

7.5 . Test report

7.5.2. The protocol must contain:

name of the organization conducting the tests;

name of the customer organization;

date of manufacture of the flame retardant composition;

method of application and thickness of the coating;

name of the flame retardant, information about the manufacturer, trademark and marking of the flame retardant, indicating the technical documentation;

date of testing;

name of the normative document for test methods;

visual observations during testing;

sketches and description of the tested samples, data on control measurements of the condition of the samples, operational properties of coatings and a list of deviations made in the manufacture of the sample from the technical documents for the design;

recording of controlled parameters, the results of their processing and evaluation;

video or photographic materials;

conclusion about the group of fire-retardant coating efficiency;

duration of the protocol.

8. Safety

According to GOST 30247.0.

Annex A

Mandatory

Rice. one. Installation for fire testing of small-sized samples of bar structures:

1 - fire chamber; 2 - laying the furnace; 3 - heating channel of the nozzle; 4 - nozzle; 5 - smoke channel; 6 - exhaust hood; 7 - arch of the furnace; 8 - test sample; 9 - air duct; 10 - thermocouple; 11 - viewing hatch

Rice. 2. Scheme of arrangement of thermoelectric converters in the middle section on the surface of the prototype:

1 - I-beam No. 20; 2 - fire-retardant coating; 3 - thermoelectric converters

Rice. 3. Installation for thermophysical research and testing of small-sized fragments of flat structures and individual nodes of their butt mates and fastenings:

1 - smoke channel; 2 - laying the furnace; 3 - fire chamber; 4 - collapsible part of the masonry; 5 - TEP; 6 - nozzle heating channel; 7 - nozzle; 8 - test sample; 9 - insert

Annex B

Mandatory

Estimation of the standard deviation of the measurement result

1. Estimation of the standard deviation

The system of regulatory documents of the State Fire Service of the Ministry of Internal Affairs of Russia

FIRE PROTECTIVE COMPOSITIONS FOR STEEL STRUCTURES

General requirements. Method for determining fire retardant effectiveness

NPB 236-97

Headquarters

State Fire Service of the Ministry of Internal Affairs of Russia

Moscow 1997

FOREWORD

DEVELOPED GUGPS Ministry of Internal Affairs of Russia, VNIIPO Ministry of Internal Affairs of Russia

INTRODUCED AND PREPARED for approval by the regulatory and technical department of the GUGPS of the Ministry of Internal Affairs of Russia

APPROVED by the Chief State Inspector of the Russian Federation for Fire Supervision

Introduced for the first time

NPB 236-97

NORMS OF THE STATE FIRE SERVICE OF THE MIA OF RUSSIA

FIRE PROTECTIVE COMPOSITIONS

FOR STEEL STRUCTURES

General requirements.

Method of determination

fire retardantefficiency

FIRE RETARDANT COMPOSITIONS

FOR STEEL CONSTRUCTIONS.

GENERAL REQUIREMENT.

METHOD FOR DETERMINING

FIRE RETARDANT EFFICIENCY

the date introductions 1997-06-01

1 AREA OF USE

These standards establish general requirements for fire retardants for steel structures, as well as a method for determining their fire retardant effectiveness.

The standards do not apply to the determination of the fire resistance limits of structures with fire protection.

Compliance with the requirements of these standards is mandatory when developing regulatory and technical documentation for these fire protection equipment and during their certification.

2. REGULATORY REFERENCES

GOST 30247.0-94 “Building structures. Test methods for fire resistance. General requirements".

GOST 8239-89 “Hot-rolled steel I-beams. Assortment".

SNiP 11-01-95 "Instruction on the procedure for the development, approval, approval and composition of project documentation for the construction of enterprises, buildings and structures."

GOST 16523-89 Rolled thin-sheet carbon steel of high quality and ordinary quality for general purposes. Specifications".

3. TERMS AND DEFINITIONS

The following terms and definitions are used in these standards:

Fire retardant- a flame retardant composition or material that has fire retardant effectiveness and is specially designed for fire protection of various objects.

Flame retardant- a substance or mixture of substances with fire-retardant effectiveness and specially designed for fire protection of various objects.

Fire protection object- a material, structure or product treated with a fire protection agent in order to reduce their fire hazard and (or) increase fire resistance.

Fire retardant treatment- application of a flame retardant composition on the surface of the object of fire protection (painting, coating, spraying, etc.).

Structural methods of fire protection- lining the fire protection object with materials or other design solutions for its fire protection.

Combined way - combinations of various methods of flame retardant treatment.

fire retardant coating- a layer of flame retardant composition obtained as a result of surface treatment of the object of fire protection.

Fire retardant efficiency- a comparative indicator of fire protection affinity, which is characterized by the time in minutes from the start of the fire test to reaching the critical temperature (500 ° C) of a standard sample of a steel structure with a fire retardant coating and is determined by the method described in section 6 of these standards.

Reduced Thicknessmetal- the ratio of the cross-sectional area of the metal structure to the heated part of its perimeter.

Warranty period of operation- the time during which the specified fire-retardant efficiency of the coating, operated in accordance with the technical documentation, is guaranteed.

4. GENERAL REQUIREMENTS

4.1. Flame retardants must have technical documentation for their production and use, must be approved and agreed upon in the prescribed manner, and must also have a fire safety certificate.

4.2. The technical documentation must contain the following indicators and characteristics of flame retardants:

fire retardant efficiency group;

Consumption for a certain fire-retardant efficiency group;

Appearance;

Information on application technology: surface preparation methods, types and grades of primers, adhesion, number of layers, drying conditions;

Warranty period and storage conditions of the composition;

Measures for safety and fire safety during the storage of compositions and the production of work.

If necessary, the technical documentation should indicate information on the types and brands of paints and varnishes that are acceptable for application over the fire-retardant layer in order to protect it from environmental influences or to give the coating decorative properties.

In addition, the technical documentation must contain the following information about the fire retardant coating:

Thickness for a certain group of fire-retardant efficiency;

Operating conditions (limit values of humidity, ambient temperature, etc.);

Appearance;

Bulk weight;

Warranty period of operation;

The possibility and frequency of replacement or restoration of the coating, depending on the operating conditions.

4.3. Production and supply of flame retardants, design and performance of works on fire protection of structures should be carried out by organizations licensed for this type of activity.

4.4. The use of fire protection equipment must be carried out in accordance with the technical documentation and the project developed, agreed and approved in the manner prescribed by SNiP 11-01-95.

4.5. The group of flame retardant effectiveness of flame retardants is determined in accordance with clause 6.5.3 of these standards.

4.6. Tests to determine the flame retardant effectiveness must be carried out in a specialized organization that has the appropriate accreditation.

4.7. Simultaneously with tests to determine the fire-retardant efficiency, control tests are carried out in accordance with Section 7 of these standards.

4.8. Fire-retardant coatings must be able to be restored after the warranty period.

It is not allowed to use fire-retardant coatings on objects of protection located in places that exclude the possibility of replacing or restoring (restoring) the coating.

4.9. When using flame retardants with protection of the coating surface with paints and varnishes, the fire retardant characteristics should be determined taking into account the surface layer.

4.10. The indicators and characteristics of fire retardant compositions and coatings, with the exception of the fire retardant efficiency group, are determined by the developer of the technical documentation, for which he bears the responsibility established by law.

4.11. With a scientific and technical justification, at the initiative of the customer, tests can be carried out according to an expanded program, the purpose of which will be to build a generalized dependence of the fire retardant effectiveness of a particular fire protection product on the reduced thickness of the metal and the thickness of the fire retardant coating.

4.12. Packaging, storage and transportation conditions of flame retardants must ensure their fire retardant properties during the specified shelf life.

4.13. It is not allowed to use flame retardants on unprepared (or prepared in violation of the requirements of the technical documentation for these compositions) surfaces of protected objects.

5. CERTIFICATION OF FIRE-PROOF COATINGS

5.1. To obtain a fire safety certificate, the customer must submit to the certification body:

Developed and duly approved technical documentation for the fire retardant composition;

Test reports confirming the flame retardant effectiveness of the composition.

5.2. In addition to the general information established by the certificate form, the fire safety certificate for a flame retardant must contain the following special indicators and characteristics:

The name of the flame retardant;

Fire retardant efficiency group;

Types, brands, thickness of layers of ground, decorative or weather-resistant paint coatings used in combination with the specified fire protection agent during certification tests;

The thickness of the fire retardant coating and the consumption of the fire retardant composition for the established fire retardant efficiency group.

6. METHOD FOR DETERMINING FIRE PROTECTION EFFICIENCY

6.1. Method Essence

6.2. Test Equipment

6.2.1. Equipment includes:

Installation for fire testing of small-sized samples of rod structures;

Devices for setting the sample;

A system for measuring and recording parameters, including equipment for film, photo or video filming.

6.2.2. The main dimensions and installation diagram are shown in Figure 1 of mandatory Appendix A.

6.2.3. Requirements for the fuel supply and combustion system, systems for measuring and recording parameters, temperature conditions in the installation - in accordance with GOST 30247.0.

6.3. Samples for testing

6.3.1. For testing, two identical samples are made.

6.3.2. The specimens on which the flame retardant is applied should be I-section steel columns of profile No. 20 according to GOST 8239. The specimen height is 1700 ± 10 mm with a reduced metal thickness of 3.4 mm.

6.3.3. Flame retardants are applied to the samples in accordance with the technical documentation (surface cleaning of steel samples, type of primer, amount and thickness of the applied layer, etc.).

Note - Before applying a fire-retardant coating, its identification must be carried out. Experimental identification of the fire-retardant coating is carried out using thermal analysis equipment.

6.3.4. The humidity of the coating must be dynamically balanced with the environment with a relative humidity of 60 ± 15% at a temperature of 20 ± 10 °C.

6.3.5. When conducting certification tests, sampling must be carried out in accordance with the requirements of the certification procedure.

6.4. Preparation and conduct of tests

6.4.1. Test conditions - according to GOST 30247.0.

Measurement accuracy at coating thickness:

Up to 10 mm - 0.01 mm;

Up to 20 mm - 0.05 mm;

Up to 50 mm - 0.5 mm.

6.4.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

6.4.6. During the testing process, the following indicators are recorded:

Temperature change in the furnace in accordance with paragraph 6.4.1 of these standards;

Change in the temperature of the metal of the prototype.

6.4.7. Tests are carried out without static load under four-sided thermal action until the limit state of the prototype occurs.

6.4.8. The achievement of the critical temperature of the steel of prototypes equal to 500 °C (averaged over three TECs) is taken as the limiting state.

6.5. Evaluation of test results

6.5.1. The test result is the time (in minutes) to reach the limit state of the prototype.

6.5.3. The fire-retardant effectiveness of the compositions is divided into 5 groups: 1st group - at least 150 minutes; 2nd - at least 120; 3rd - at least 60; 4th - at least 45; 5th - at least 30.

When determining the group of fire-retardant effectiveness of the compositions, test results with indicators of less than 30 minutes are not considered.

7. CONTROL METHOD FOR TESTING FIRE RETARDANT COMPOSITIONS

7.1. Method Essence

7.2. Samples for testing

7.2.1. For testing, one sample is made.

7.2.2. A steel plate 600×´600´5 mm in size is used as a sample, with a flame retardant applied to it. Permissible deviations in the width and length of the steel plate should not exceed ± 5 mm, and in thickness - ± 0.5 mm.

7.2.3. The unheated surface of the prototype must be thermally insulated with a material with a thermal resistance value of at least 1.9 m 2 -°C / W and a thickness of at least 100 mm.

7.3. Testing

7.3.1. Test conditions - according to GOST 30247.0.

7.3.3. Requirements for testing equipment and measuring instruments, temperature conditions - in accordance with GOST 30247.0.

7.3.4. The temperature on the surface of steel specimens is measured using TECs made of wire with a diameter of not more than 0.75 mm, which are installed by caulking on the unheated surface of the specimens in the amount of three pieces. One of the TECs is installed in the center of the sample, and the other two are installed diagonally at a distance of 200 ± 5 mm from the center.

7.3.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

7.3.6. During the testing process, the following indicators are recorded:

Time of onset of the limit state;

Temperature change in the furnace;

Behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

Temperature change on the unheated surface of the prototype.

7.3.7. Tests are carried out until the limit state of the prototype.

7.3.8. The limit state is taken as the time to reach a temperature of 500°C for the steel of prototypes (average temperature over three TECs).

7.4. Evaluation of test results

7.4.1. The result is the time to reach the limit state.

7.4.2. The results of subsequent tests should not differ from the test results of the control sample by more than 20% in the direction of reducing the time to reach the limit state.

7.5. Test report

7.5.2. The protocol must contain:

Name of the organization conducting the tests;

Name of the customer organization;

Date of manufacture of the flame retardant;

Application method and coating thickness;

Name of the flame retardant, information about the manufacturer, trademark and marking of the flame retardant, indicating the technical documentation;

date of testing;

Name of the normative document for test methods;

Visual observations during testing;

Recording of controlled parameters, the results of their processing and evaluation;

Video or photographic materials;

Conclusion on the fire retardant effectiveness of the coating,

The duration of the protocol.

The system of regulatory documents of the State Fire Service of the Ministry of Internal Affairs of Russia

NORMS OF THE STATE FIRE SERVICE OF THE MIA OF RUSSIA

FIRE PROTECTIVE COMPOSITIONS FOR STEEL STRUCTURES

General requirements. Method for determining fire retardant effectiveness

NPB 236-97

Headquarters

State Fire Service of the Ministry of Internal Affairs of Russia

4.5. The group of flame retardant effectiveness of flame retardants is determined in accordance with these standards.

4.6. Tests to determine the flame retardant effectiveness must be carried out in a specialized organization that has the appropriate accreditation.

4.7. Simultaneously with tests to determine the fire-retardant efficiency, control tests are carried out in accordance with these standards.

4.8. Fire-retardant coatings must be able to be restored after the warranty period.

It is not allowed to use fire-retardant coatings on objects of protection located in places that exclude the possibility of replacing or restoring (restoring) the coating.

4.9. When using flame retardants with protection of the coating surface with paints and varnishes, the fire retardant characteristics should be determined taking into account the surface layer.

4.12. Packaging, storage and transportation conditions of flame retardants must ensure their fire retardant properties during the specified shelf life.

4.13. It is not allowed to use flame retardants on unprepared (or prepared in violation of the requirements of the technical documentation for these compositions) surfaces of protected objects.

5. CERTIFICATION OF FIRE-PROOF COATINGS

5.1. To obtain a fire safety certificate, the customer must submit to the certification body:

Developed and duly approved technical documentation for the fire retardant composition;

Test reports confirming the flame retardant effectiveness of the composition.

5.2. In addition to the general information established by the certificate form, the fire safety certificate for a flame retardant must contain the following special indicators and characteristics:

The name of the flame retardant;

Fire retardant efficiency group;

Types, brands, thickness of layers of ground, decorative or weather-resistant paint coatings used in combination with the specified fire protection agent during certification tests;

The thickness of the fire retardant coating and the consumption of the fire retardant composition for the established fire retardant efficiency group.

6. METHOD FOR DETERMINING FIRE PROTECTION EFFICIENCY

6.1. Method Essence

6.2. Test Equipment

6.2.1. Equipment includes:

Installation for fire testing of small-sized samples of rod structures;

Devices for setting the sample;

A system for measuring and recording parameters, including equipment for film, photo or video filming.

6.2.2. The main dimensions and installation diagram are given on the mandatory.

6.2.3. Requirements for the fuel supply and combustion system, systems for measuring and recording parameters, temperature conditions in the installation - in accordance with GOST 30247.0.

6.3. Samples for testing

6.3.1. For testing, two identical samples are made.

6.3.2. As samples on which the fire retardant composition is applied, steel columns of an I-section profile No. 20 according to GOST 8239 should be used. Sample height 1700 ± 10 mm with a reduced metal thickness of 3.4 mm.

6.3.3. Flame retardants are applied to the samples in accordance with the technical documentation (surface cleaning of steel samples, type of primer, amount and thickness of the applied layer, etc.).

6.3.4. The humidity of the coating must be dynamically balanced with the environment with a relative humidity of 60 ± 15% at a temperature of 20 ± 10 °C.

6.3.5. When conducting certification tests, sampling must be carried out in accordance with the requirements of the certification procedure.

6.4. Preparation and conduct of tests

Measurement accuracy at coating thickness:

Up to 10 mm - 0.01 mm;

Up to 20 mm - 0.05 mm;

Up to 50 mm - 0.5 mm.

6.4.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

6.4.6. During the testing process, the following indicators are recorded:

Changing the temperature in the furnace in accordance with these standards;

Change in the temperature of the metal of the prototype.

6.4.7. Tests are carried out without static load under four-sided thermal action until the limit state of the prototype occurs.

6.4.8. The achievement of the critical temperature of the steel of prototypes equal to 500 °C (averaged over three TECs) is taken as the limiting state.

6.5. Evaluation of test results

6.5.1. The test result is the time (in minutes) to reach the limit state of the prototype.

When determining the group of fire-retardant effectiveness of the compositions, test results with indicators of less than 30 minutes are not considered.

7. CONTROL METHOD FOR TESTING FIRE RETARDANT COMPOSITIONS

7.1. Method Essence

7.2. Samples for testing

7.2.1. For testing, one sample is made.

7.2.3. The unheated surface of the prototype must be thermally insulated with a material with a thermal resistance of at least 1.9 m2 -°C/W and a thickness of at least 100 mm.

7.3. Testing

7.3.1. Test conditions - according to GOST 30247.0.

7.3.3. Requirements for test equipment and measuring instruments, temperature conditions - in accordance with GOST 30247.0.

7.3.5. The temperature of the metal of the test sample is determined as the arithmetic mean of the readings of the TEC located in the specified places.

7.3.6. During the testing process, the following indicators are recorded:

Time of onset of the limit state;

Temperature change in the furnace;

Behavior of the fire-retardant coating (swelling, charring, delamination, emission of smoke, combustion products, etc.);

Temperature change on the unheated surface of the prototype.

7.3.7. Tests are carried out until the limit state of the prototype.

7.3.8. The limit state is taken as the time to reach a temperature of 500°C for the steel of prototypes (average temperature over three TECs).

7.4. Evaluation of test results

7.4.1. The result is the time to reach the limit state.

7.4.2. The results of subsequent tests should not differ from the test results of the control sample by more than 20% in the direction of reducing the time to reach the limit state.

7.5. Test report

7.5.2. The protocol must contain:

Name of the organization conducting the tests;

Name of the customer organization;

Date of manufacture of the flame retardant;

Application method and coating thickness;

Name of the flame retardant, information about the manufacturer, trademark and marking of the flame retardant, indicating the technical documentation;

date of testing;

Name of the normative document for test methods;

Visual observations during testing;

Figure 2 - Scheme of arrangement of thermoelectric converters in the middle section on the surface of the prototype

1 - I-beam No. 20; 2 - fire retardant coating; 3 - thermoelectric converters

1 - smoke channel; 2 - oven masonry; 3 - fire chamber; 4 - collapsible part of the masonry; 5 - TEP; 6 - heating channel of the nozzle; 7 - nozzle; 8 - test sample; 9 - insert