The estimated volume of the room for gas fire extinguishing. Selection and calculation of a gas fire extinguishing system

No need to rush to conclusions!
These formulas only show consumption in numbers.
Let's digress from the "candy wrappers" and pay attention to the "candy" and its "stuffing". And "candy" is formula A.16. What does she describe? Losses in the pipeline section, taking into account the flow of nozzles. Let's take a look at it, or rather what is in brackets. The left side describes the wiring of the main part of the pipeline and the processes in a cylinder or a gas fire extinguishing station, it is of little interest to us now, as a certain constant for wiring, while the right one is of particular interest! This is the whole highlight with the sum sign! Let's simplify the notation, let's transform the rightmost part inside the bracket space: (n^2*L)/D^5,25 into this form: n^2*X. Let's say you have six nozzles in a pipeline section. In the first section to the first nozzle (counting from the side of the cylinder), you have GOTV flowing to all six nozzles, then the losses in the section will be the losses to the nozzle plus what will leak further along the pipeline, the pressure will be less than if there was a plug after the nozzle. Then the right side will look like: 6 ^ 2 * X1 and we will get the parameter "A" for the first nozzle. Next, we come to the second nozzle and what do we see? And the fact that part of the gas is consumed by the first nozzle, plus what was lost in the pipe on the way to the nozzle, and what will leak further (taking into account the flow rate at this nozzle). Now the right side will already take the form: 6 ^ 2 * X1 + 5 ^ 2 * X2 and we will get the parameter “A” on the second nozzle. Etc. Here you also have expenses on each nozzle. Summing up these costs, you will get the cost of your installation and the time of release of GOTV. Why is everything so difficult? Very simple. Let's say that the wiring has the same six nozzles and a branch (let's say that the right shoulder has two nozzles, and the left - 4), then we will describe the sections:
1) GOTV flows through it to all nozzles: 6 ^ 2 * X1;
2) flows along it to two nozzles on the right shoulder 6^2*X1+2^2*X2 - Parameter "A" for the first nozzle;
3) Parameter "A" for the second nozzle on the right shoulder 6^2*X1+2^2*X2+1^2*X3;
4) Parameter "A" for the third piping nozzle or the first nozzle on the left arm: 6^2*X1+4^2*X4;
5) and so on "according to the text."
I deliberately "torn off a piece" of the main pipeline to the first section for greater readability. In the first section, the flow rate is for all nozzles, and in the second and fourth sections, only for two on the right shoulder and four on the left, respectively.
Now you can see in the numbers that the flow rate on 20 nozzles is always more than on one with the same parameters as 20.
In addition, with the naked eye you can see what is the difference between the flow rates between the “dictating” nozzles, that is, the nozzles located in the most advantageous place in the piping (where there are the least losses and the highest flow rate) and vice versa.
That's all!

Currently, gas fire extinguishing is an effective, environmentally friendly and universal way to fight fire at an early stage of a fire.

The calculation of the installation of gas fire extinguishing systems is widely used at facilities where it is undesirable to use other fire fighting systems - powder, water, etc.

Such objects include premises with electrical equipment placed inside, archives, museums, exhibition halls, warehouses with explosive substances located there, etc.

Gas fire extinguishing and its undeniable advantages

In the world, including Russia, gas fire extinguishing has become one of the widely used methods for eliminating a fire source due to a number of undeniable advantages:

• minimizing the negative impact on the environment due to the release of gases;
• ease of removal of gases from the room;
• accurate distribution of gas over the area of ​​​​the entire room;
• non-damage to property, valuables and equipment;
• functioning in a wide temperature range.

Why is a gas fire extinguishing calculation necessary?

To select a particular installation in a room or on an object, a clear calculation of gas fire extinguishing is required. So, there are centralized and modular complexes. The choice of one or another type depends on the number of rooms that need to be protected from fire, the area of ​​\u200b\u200bthe object and its variety.

Taking into account these parameters, gas fire extinguishing is calculated, with the obligatory consideration of the mass of gas necessary to eliminate the source of ignition in a certain area. For such calculations, special methods are used, taking into account the type of fire extinguishing agent, the area of ​​\u200b\u200bthe entire room and the type of fire installation.

For and calculation, the following parameters must be taken into account:

• area of ​​​​the room (length, ceiling height, width);
• object type (archive, server rooms, etc.);
• the presence of open openings;
• type of combustible substances;
• fire hazard class;
• the degree of removal of the security console from the premises.

The need to calculate gas fire extinguishing

Fire extinguishing calculation is a preliminary stage before installing a gas fire extinguishing system at the facility. To ensure the safety of people and the safety of property, it is necessary to carry out a clear calculation of the equipment.

The validity of the calculation of gas fire extinguishing and subsequent installation at the facility is determined by the regulatory documentation. Be sure to use this system in server rooms, archives, museums and data centers. In addition, such installations are mounted in closed parking lots, in repair shops, and warehouse-type premises. The calculation of fire extinguishing directly depends on the size of the room and the type of goods stored in it.

The undeniable advantage of gas fire extinguishing over powder or water installations is the lightning-fast response and operation in the event of a fire, while the objects or materials in the room are reliably protected from the negative effects of fire extinguishing agents.

At the design stage, the amount of fire extinguishing agent required to eliminate the fire is calculated. The further functioning of the complex depends on this stage.

Hydraulic calculation is the most difficult stage in the creation of AUGPT. It is necessary to choose the diameters of the pipelines, the number of nozzles and the area of ​​the outlet section, to calculate the real time of the exit of the GFFS.

How will we count?

First you need to decide where to get the methodology and formulas for hydraulic calculation. We open the set of rules SP 5.13130.2009, Appendix G and see there only the methodology for calculating low-pressure carbon dioxide fire extinguishing, but where is the methodology for other gas fire extinguishing agents? We look at paragraph 8.4.2 and see: "For the rest of the installations, it is recommended to calculate according to the methods agreed in the prescribed manner."

Programs for calculation

Let us turn to the manufacturers of gas fire extinguishing equipment for help. In Russia, there are two methods for hydraulic calculations. One was developed and copied many times by leading Russian equipment manufacturers and approved by VNIIPO, on its basis the ZALP, Salyut software was created. The other was developed by the TACT company and approved by the DND of the Ministry of Emergency Situations, and the TACT-gas software was created on its basis.

The methods are closed to most design engineers and are for internal use by manufacturers of automatic gas fire extinguishing installations. If you agree, they will show it to you, but without special knowledge and experience, it will be difficult to perform a hydraulic calculation.

Fill in the form fields to find out the cost of a gas fire extinguishing system.

The preference of domestic consumers in favor of effective fire extinguishing, in which gas fire extinguishing agents are used to eliminate fires in electrical equipment and fires of class A, B, C (according to GOST 27331), is explained by the advantages of this technology. Fire extinguishing with the use of gas, in comparison with the use of other fire extinguishing agents, is one of the most non-aggressive methods of eliminating fires.

When calculating the fire extinguishing system, the requirements of regulatory documents, the specifics of the facility are taken into account, and the type of gas installation is determined - modular or centralized (the possibility of extinguishing a fire in several rooms).
Automatic gas fire extinguishing installation consists of:

• cylinders or other containers intended for the storage of a gaseous fire extinguishing agent,
• pipelines and directional valves that provide the supply of a fire extinguishing agent, gas (freon, nitrogen, CO2, argon, sulfur hexafluoride, etc.) in a compressed or liquefied state to the source of ignition,
• detection and control devices.

When making an application for the supply, installation of equipment or a full range of services, the clients of our company "CompaS" are interested in the estimate for gas fire extinguishing. Indeed, the information that this type is among the "expensive" ways to extinguish a fire is true. However, an accurate calculation of the fire extinguishing system, made by our specialists, taking into account all the conditions, demonstrates that in practice an automatic gas fire extinguishing installation can be the most effective and beneficial for the consumer.

Fire extinguishing calculation - the first stage of installation design

The main task for those who order gas fire extinguishing is to calculate the cost of the mass of gas that will be required to extinguish the fire in the room. As a rule, fire extinguishing is calculated by area (length, height, width of the room), under certain conditions, other parameters of the object may be required:

• type of premises (server room, archive, data center);
• the presence of open openings;
• if there is a raised floor and a false ceiling, indicate their heights;
• minimum room temperature;
• types of combustible materials;
• type of extinguishing agent (optional);
• explosion and fire hazard class;
• remoteness of the control room / security console from the protected premises.

Our company's customers can pre-order.