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Our site is dedicated to equipment and services in the field of security systems and electrical engineering.
The site section presents electrical explosion-proof equipment manufactured by domestic and foreign manufacturers. This is the most complete collection of descriptions of devices, materials and components for creating security systems at fire, explosion and industrial facilities. Our site presents the latest innovations and achievements in this area.
In the site section SUSPENSION FIRE DETECTORS devices and systems for early and ultra-early fire detection, sensitive to the appearance of smoke in very low concentrations, are presented. These are the products of two world brands: WAGNER TITANUS and VESDA Xtralis.
Company WAGNER (Germany)- European leader in the development and supply of aspirating fire detectors and systems under the trademark TITANUS. Aspiration fire detectors and systems are the means of the earliest detection of fires, they are especially relevant at facilities with large material and informational values, such as: bank vaults, depositories, data processing centers, electronic libraries, server rooms, storage terminals, warehouses, archives, libraries, museums, transport facilities, including underground, fire and explosive facilities.
Company Xtralis (Australia)- trademark - is an innovator in the field of security of objects of special importance. Xtralis is the world's largest manufacturer of aspirating smoke detectors. Today, the world's most reputable companies and leading government organizations rely on VESDA technology for the fire protection of various facilities. VESDA has developed the most effective fire safety systems available today with early fire detection. VESDA doesn't register a fire, it detects it!
Since 2002, ERVIST Group has been actively cooperating with a number of leading Russian enterprises in the field of joint development and production of various products. One of these companies is the Scientific and Production Association "Spectron"- the leader of the Russian market of fire detectors and annunciators, producing products under the trademarks "Spectron" and "Prometheus". The range of NPO Spektron includes over 300 items of general industrial and explosion-proof electrical equipment: flame detectors, manual call points and remote start devices, heat detectors; light, sound and light-sound annunciators, scoreboards, horns, junction boxes and heating cabinets.
Since 2014, joint products have also been produced with the company "Relion"- the largest Russian developer and manufacturer of explosion-proof and industrial professional equipment for video surveillance systems under its own brand name "Relion". Currently, the company produces over 200 types of general industrial and explosion-proof products: explosion-proof, industrial and vandal-proof video cameras, explosion-proof PTZ cameras, explosion-proof dome cameras, thermal housings for protecting video cameras in explosive zones and aggressive environments, explosion-proof IR illuminators, explosion-proof switches, explosion-proof and industrial heating cabinets, as well as a wide range of additional equipment: junction boxes, cable glands, brackets, adapters and much more.
The page of each device is supplemented with reference technical information: passports and operation manuals, certificates.
In chapter WEBINARS ARCHIVE you can easily find video recordings of all webinars held within the framework of the program ERVIST FORUM– online professional discussions and promotion of advanced products and solutions.
The page is dedicated to the design, installation and maintenance of security systems. In the near future, we plan to introduce our potential customers to specific technical solutions on this topic.
A spray booth is a specially equipped industrial-type room used for operations related to painting. This is a universal paint box in which complex technological processes take place. That is why the basic requirements for spray booths are fixed at the legislative level, which they must comply with in order to ensure the most efficient and safe operation.
If you plan to purchase, you must very carefully study all its features and most important characteristics. For trouble-free and trouble-free operation, the camera must meet the following criteria:
- Without fail, the box must have a high-quality ventilation system that ensures the inflow and outflow of air masses. Ventilation must be continuous, which will ensure the rapid removal of contaminants from the room.
- To ensure maximum quality of work, it is necessary to pre-clean the air masses. Therefore, without the presence of a high-tech cleaning system is indispensable. This will eliminate possible problems during operation and protect the equipment from defects.
- Coloring is carried out under certain parameters of temperature and humidity. That is why a system should be installed in the box that allows you to reach the required indicators of the microclimate in the room as quickly as possible. At the same time, it is extremely important that the set parameters are stable and hold for the set time. For chambers, there is a rule under which the maximum temperature fluctuations should not exceed 3.5 degrees.
- Quality work is carried out with the proper level of lighting. Ideally, in the coloring box, the light should be as close to daylight as possible.
- Modern technical equipment should be ergonomic. This means that the consumption of materials is set to a minimum during operation, which helps to achieve significant savings in resources in the end. At the same time, it should be mentioned that you should not save on the quality of equipment and materials used in boxing.
- The paint box must demonstrate extremely high safety performance, both for humans and for the environment. And this can be achieved by creating an absolute tightness of the room.
Spray booth: fire safety requirements
Boxes for coloring should have extremely high fire safety indicators. All models, etc., which you can find in the catalog of our company, meet all fire safety requirements. According to the general recommendations of fire protection requirements, a standard spray booth must comply with the following rules:
- The walls of the chamber should not be insulated with materials that have high flammability. Otherwise, during the drying process of painted parts, the risk of fire increases significantly.
- The paint box must demonstrate ultimate tightness, which eliminates ignition problems in difficult situations.
- The standard rule is that in order to comply with fire requirements, the box must have at least 2 doors.
- If during operation there was a spill of consumables (solvents, paints and varnishes), they must be removed immediately. At the same time, it is forbidden to use detergents and specialized substances that are prone to ignition.
- It is strongly not recommended to use the working life of the camera when the ventilation is turned off or there is a breakdown in the system.
- To prevent possible fires, the box is additionally equipped with special means for extinguishing fires, as well as a box with sand.
- The staining procedure takes place in an electric field, therefore all devices must be protected from the appearance of possible sources of danger.
- If combustible materials are used in the course of work, their quantity should not exceed the needs of the shift. At the same time, containers should be opened only before the start of work, and they should be stored in specially designated boxes.
- The paint box must be made of durable materials with a low level of combustion.
- The location of the box near residential areas, as well as potentially dangerous objects, is strictly prohibited.
Introduction
Justification of the need for the application and type of APPZ
Selecting the type of fire extinguishing installation
Plant design
SPS system design
The layout of the main units and a description of the operation of the APPZ installation
Brief operating instructions for APPZ units
Literature
INTRODUCTION
The wide scope of cultural, housing and industrial construction, the change in the structure of modern production, the high degree of concentration of material assets, the transition to the construction of high-rise buildings require the use of effective fire protection measures. As experience shows, an effective direction in solving the problem of fire protection of national economy facilities is the mass introduction of fire alarm and fire extinguishing devices and systems. Early detection of a small fire source by a fire detector and transmission of an alarm signal to the duty panel allows you to take the necessary measures in a timely manner and eliminate the fire source at the initial stage of its development.
APS systems are a complex of complex technical devices that ensure the fire safety of people, process equipment, material assets and building structures of buildings and structures. Such systems, without human intervention, detect a fire, give an alarm and eliminate fires in the initial stage of their development. They are an integral part of equipping modern buildings and structures with safety and labor protection means.
APS systems are increasingly being used in a wide variety of objects of various forms of ownership. The efficiency of technical means of APS is constantly increasing, their specialization is expanding.
In modern devices and systems of APPZ, scientific achievements of automation and electronics are widely used, ensuring their high reliability and efficiency.
Analyzing the facts of the increase in the occurrence of fires, it is easy to conclude that the pace of deployment of fire protection is lagging compared to the growth rate of materialized fire danger, which is expressed in new products, equipment, technology machines. As a result, both the number of fires that have arisen and the damage from them have clear upward trends. The suppression of these tendencies affects significant material and human resources, including fire automatics. These trends can be stabilized and even reduced if at all levels of fire danger: at the stages of research and development, development, pilot production. Thanks to this, it will be possible to timely detect potentially fire-hazardous developments and take measures to eliminate sources of danger.
In this course project, I am developing automatic fire protection for a spray booth using flammable liquids (20x15x5).
JUSTIFICATION OF THE NEED FOR APPLICATION AND TYPE OF APPZ FOR GIVEN ROOMS
All buildings and premises with a high fire hazard are equipped with fire automatics. There are two approaches to the issue of the use of fire automation - deterministic and probabilistic.
Deterministic requirements for the choice of fire automatics are set out in regulatory documents - building codes and regulations (SNiP) and building codes of Belarus (SNB), as well as lists of designed, reconstructed and technically re-equipped buildings and premises of national economy objects of republican ministries, departments and societies to be equipped automatic fire extinguishing means and automatic fire alarm (by ministries). It is obvious that the deterministic method for determining the need for AFPP and its type is based on average indicators of the fire hazard of premises. In addition, it cannot quickly respond to new technological processes, changes in their modes, changes in the fire load in the premises, etc. Therefore, in cases where there is no regulatory justification for the need and type of APPZ, or if it is necessary to extend the provision of the standard to new production, a probabilistic method based on is used.
The probabilistic approach to the use of fire automatics is based on the observance of the required level of ensuring the fire safety of people and material assets. The basic data for the calculation are the classification of objects according to explosion and fire hazard, the characteristics of escape routes, the critical duration of a fire, and statistical data on fires. This method is based on complex calculations and is used much less frequently than the deterministic one.
In our case, it is necessary to justify the type of APPZ installation for a spray booth using flammable liquids (20x15x5). The area of the premises is 300 m 2 . According to, which is a regulatory document in the Republic of Belarus, protection is necessary with automatic fire extinguishing installations.
SELECTING THE TYPE OF FIRE EXTINGUISHING INSTALLATION
The type of fire extinguishing installation is determined by the selected fire extinguishing agent, extinguishing method and incentive system.
The choice of the type of fire extinguishing agent is made taking into account the compatibility of its properties with the properties of substances and materials to be extinguished. Since a large number of books are concentrated in the book depository of the library, some of them are of historical value, it is necessary to choose the most effective fire extinguishing agent for successful fire extinguishing and safety.
So, according to Table. 4.1 The agent for extinguishing substances and materials in the spray booth using flammable liquids is water, water with wetting agents or low expansion foam.
We accept low expansion foam as the most effective fire extinguishing agent (including compatibility with combustible materials).
In case of fires in the workshops of spray booths, the dynamics of the development of a fire depends on the location and workload (the presence of flammable liquids, paints and varnishes and the equipment used for painting). In the initial stage of fire development, there is a rapid increase in temperature, and then a rapid increase in the area of fire. In this regard, in order to prevent the further spread of fire in the volume of the spray booth, it is necessary to apply low-expansion foam in the shortest possible time. The most appropriate would be the use of an automatic foam fire extinguishing installation (AUPP).
Knowing the dependence of the determining factor of a fire on the time of its development, it is possible to determine the maximum allowable time for detecting a fire by an incentive system and thereby choose its type.
As follows from Fig. 1, the admissible fire detection time T det.add., consisting of the time to the trigger threshold T thr. and the inertia of the stimulator T in.pob. under the developing conditions of a real fire, is determined from the condition:
T update.add \u003d T por.av. + T in.pob.< Т пред. - Т ин.эл. -Т ин.мех.
where, T pred - the maximum allowable time for the development of a fire,
T in.el. , T in.fur. - respectively, the inertia of the electrical system of the installation and the mechanical and hydraulic systems of the AFS.
On the vertical axis in Fig. 1, a dangerous factor in the development of a fire and its critical value are plotted, and on the horizontal axis - time. T srab.aup (AUP response time).
The values included in the expression T obv.adm., are determined as follows.
Fig.1. Graphic model of fire development.
The maximum allowable time for the development of a fire is determined directly from the graph of the dependence of a hazardous fire factor on time as the moment it reaches its critical value. The inertia of the electrical circuit of the installation is, according to experimental data, 1-2 seconds, the inertia of the mechanical and hydraulic systems of the AFS depends on the type of installation, the type and method of supplying the fire extinguishing agent and can approximately be taken within 10-30 seconds. Actual fire detection time must be less than or equal to the value of T rev. add. It is determined for various types of stimuli depending on the conditions for the development of a particular fire.
Proceeding from the foregoing, we accept the electric system from the SPS as an incentive system.
INSTALLATION DESIGN
The extinguishing agent is supplied to the protected premises with the help of sprinklers. Given that the distance between sprinklers should be no more than 4 meters, the maximum area controlled by one sprinkler is 12 meters; the intensity of irrigation with a foaming agent solution of at least 0.15 l / cm 2 for placing a spray booth using flammable liquids (group 4.1.) (Table 1) determines that it is necessary to install 25 sprinklers.
The distance from the wall to the sprinkler is no more than 1.5 m. Pipelines should be designed from steel pipes with welded and flanged joints (clause 5.26).
The equipment of automatic water and foam fire extinguishing installations is located in a room that is separated from other rooms by fire partitions with a fire resistance rating of at least EI 45 and ceilings with a fire resistance rating of at least REI 45.
Control units on the first floor of the building. For foam fire extinguishing installations, it is necessary to provide a 100% supply of foam concentrate. Pumping stations must be located in a separate building on the ground floor. They must have a separate exit to the outside (p. 5.56). The room of the pumping station should be separated from other rooms by p / n partitions. The station must be equipped with a telephone connection with a fire station with personnel on round-the-clock duty (clause 5.67).
Gate valves installed on pipelines filling the OTV tank should be installed in the pumping station room (clause 5.71). Control and measuring devices and measuring rails must be installed in the premises of the fire extinguishing station to ensure visual control (clause 5.72).
Spray booths are closed premises, so their equipment must be special. The main meaning of these designs is to carry out work on the creation of car paintwork. In addition, these chambers are often intended for drying work after painting. In this case, they are called painting-drying. It is very important that during the procedures in such devices all fire safety requirements are observed, as well as sanitation and hygiene standards are taken into account. These requirements include many points, in accordance with state regulations. In order to briefly understand the main norms, let us dwell on the most significant of them.
The preparation and dilution of all types of paint and varnish products should be carried out in isolated places near external walls with window openings, or in open areas. Materials are supplied centrally, already prepared. Varnishes and paints should be placed in the pantry of the workshop in an amount that does not exceed the needs of the shift. Containers for dyes must be sealed; there are special places for it.
The premises themselves intended for dyeing processes and the preparation of mixtures must be equipped without fail with their own supply and exhaust ventilation, as well as local suction systems, in order to remove harmful fumes from all paint-containing devices, namely: baths for painting and dipping, pouring installations , posts where manual coloring is performed, drying chambers, etc.
Fire safety requirements for spray booths
When the ventilation is off, painting is not allowed.
In the event that consumables are accidentally spilled on the floor, they must be removed immediately with sawdust, water, etc. Washing floors using flammable substances, including solvents, is not allowed.
Spray booths are made only from non-combustible materials and are equipped with special local suction systems, which must be interconnected with devices that supply compressed air or coloring material to the spraying devices. Tanks for injecting paint must be located outside the spray booths.
The painting process is carried out in an electric field, which means that the corresponding devices must have the necessary interlock for protection, which will prevent the spraying devices from turning on in cases where the local air removal systems are not working or the conveyor is stopped.
Premises and special areas in which work with combustible substances takes place, namely the preparation of mixtures and their application to objects, must be provided with ventilation to eliminate explosive vapors.
The air exchange rate is calculated according to the production project.
During the use of combustible substances, at the workplace there should be such a quantity that does not exceed the needs of the shift. Containers with them should be opened only before use, and upon completion of work, closed and transferred to storage. Used containers must be stored in a specially equipped place located outdoors.
Work must begin from the places that are the most remote from the exits from these premises, and in the corridors - after the work is completed.
In general, it must be remembered that any booth whose purpose is painting and drying must be well ventilated, and the equipment must be protected from explosions. In addition, the units must have thermal insulation made from all-natural mineral substances, which have an increased resistance to ignition. A fire suppression system is also absolutely necessary. And, finally, if the drying chamber is still present, then there must be a heat exchanger and a protective thermostat.
These are, in general, brief requirements for the fire safety of painting chambers.
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