The hydraulic calculation of a sprinkler or deluge network has as its goal:

Determination of water flow, i.e. irrigation intensity or specific consumption, for "dictating" sprinklers (the most remote or highly located);

Comparison of the specific flow rate (irrigation intensity) with the required (normative), as well as the determination of the required pressure (pressure) at water feeders and the most economical pipe diameters.

A detailed method for calculating the hydraulic networks of sprinkler and deluge fire extinguishing installations with water and aqueous solutions, aggregate AFS with finely sprayed water, AFS with forced start and sprinkler-drencher AFS is given in Appendix B. dictating sprinkler.

When determining the parameters of the sprinkler, it is necessary to take into account some technical characteristics, which are:

Extinguishing agent consumption;

Irrigation intensity;

The maximum irrigation area within which the required intensity is provided, the distance between the sprinklers.

Sprinkler flow rate Q (dm3/s) is determined by the formula:

where K is the performance factor,

P - pressure in front of the sprinkler, MPa.

The most important parameter is the performance coefficient, that is, the ability of the sprinkler to pass a certain amount of water through itself, in turn, depends on the size of the sprinkler outlet: the larger the opening, the greater the coefficient.

To calculate the flow rate Q, it is necessary to determine the required pressure P at the sprinkler at a given irrigation intensity.

One of the ways to determine the required pressure at the sprinkler is to determine the pressure according to the graph of the dependence of the irrigation intensity of the sprinklers on the pressure (Fig. 4.1), given in the technical documentation. According to the schedule, according to a certain intensity and the selected nominal diameter of the sprinkler, the required minimum pressure is determined.

As can be seen from the graph, for an irrigation intensity of 0.12 dm 3 /m 2, three types of sprinkler are suitable - "SVN-K115", "SVN-K80" and "SVN-K57". Choose a sprinkler that provides a given intensity at a lower pressure, in our case it is "SVN-K115" according to the passport CBO0-Pho (d) 0.59-R1 / 2 / P57.B3 - (outlet diameter 15 mm., Performance coefficient K = 0.59). When choosing a sprinkler, it should also be taken into account that the minimum pressure for most sprinklers, at which the sprinkler's performance is ensured, according to the passport data, is 0.1 MPa.

Sprinkler "SVN-K115" provides irrigation intensity of 0.12 dm 3 /m 2 at a pressure of 0.17 MPa (Fig. 4.1).

Rice. 4.1. Graph of the dependence of the intensity of irrigation of sprinklers on pressure.

According to the calculation of the flow rate of the installation, it is determined from the condition of simultaneous operation of all sprinkler sprinklers mounted on the protected dictating area, determined according to Table 5.1-5.3, taking into account the fact that the flow rate of the sprinklers installed along the distribution pipes increases with distance from the "dictating" sprinkler. In this case, the total protected area can be many times larger, and the number of sprinklers can reach 800 or 1200 when using liquid flow signaling devices.

Arrangement of sprinklers is made taking into account the maximum distance, the water flow is calculated within the protected dictating area set in Table 5.1. The calculation of the distribution network of the sprinkler automatic fire protection system is checked from the condition of operation of such a number of sprinklers, the total consumption of which on the accepted protected irrigated area will be at least the normative values ​​​​of the fire extinguishing agent consumption given in tables 5.1-5.3. If, in this case, the flow rate is less than that indicated in tables 5.1-5.3, then the calculation must be repeated with an increase in the number of sprinklers and the diameters of the distribution network pipelines. Network recalculation can be repeated many times.

The authors of the manual, for simplicity, when making a hydraulic calculation for educational purposes, propose to determine the number of sprinklers to protect the minimum dictating area and their arrangement according to the formula:

Where q 1 — OTV consumption through the dictating sprinkler, l/s;

Q n - standard consumption of sprinkler AFS according to tables 5.1-5.3 SP-5.13130.2009

As a result of this assumption, the final estimated flow rate will be 10-15% higher than the standard one, but the calculation itself is greatly simplified.

For example, we will arrange the sprinklers of an automatic water fire extinguishing installation of a textile enterprise with the installation parameters:

Irrigation intensity with water - 0.12 l / (s * m 2);

Fire extinguishing agent consumption - not less than 30 l/s;

Minimum irrigation area - not less than 120 m 2 ;

The maximum distance between sprinklers is no more than 4 m;

The minimum pressure that must be provided at the dictating sprinkler Р = 0.17 MPa (Fig. 4.1.);

Estimated water flow through the dictating sprinkler located in the dictating protected irrigated area is determined by the formula:

K— sprinkler performance coefficient, taken according to the technical documentation for the product, l/(s·MPa 0.5);

The minimum estimated number of sprinklers required to protect the dictating area:

Where Q n = 30 l/s is the standard flow rate of the sprinkler AFS according to tables 5.1.

Arrangement of sprinklers on the selected minimum dictating area is shown in fig. 4.2. When placing, it must be taken into account that the distance between the sprinklers should not exceed the standard distances indicated in tables 5.1.

Rice. 4.2 Sprinkler layout

Further calculation of the installation is associated with the definition:

Pipeline diameters;

Pressures at nodal points;

Loss of pressure in pipelines, control unit and stop valves;

Flow rate on subsequent sprinklers from the dictater within the protected area;

Determination of the total estimated flow rate of the installation.

For clarity, the routing of the pipeline network along the object of protection is depicted in an axonometric view (Fig. 4.3).

Fig. 4.3 Axonometric view of a water fire extinguishing sprinkler installation according to a symmetrical dead-end scheme

The layout of sprinklers on the AUP distribution pipeline according to can be performed according to a dead-end or ring scheme, symmetrical and asymmetrical. On fig. 4.3 shows a sprinkler installation of water fire extinguishing according to a symmetrical dead-end scheme, in fig. 4.4. according to the ring asymmetric scheme.

Fig. 4.4 Axonometric view of a water fire extinguishing sprinkler installation according to an asymmetric ring scheme

The diameter of pipelines can be assigned by the designer or calculated using the formula:

Where d— diameter of the determined section of the pipeline, mm;

Q- flow rate on the determined section of the pipeline, l / s;

v- the speed of water movement should be no more than 10 m / s, and in the suction - no more than 2.8 m / s;

The pressure loss in the pipeline section is determined by the formula:

Where L- the length of the pipeline section in which pressure losses are calculated;

TO T — the specific characteristic of the pipeline is determined according to Table B.2 of Appendix B.

After determining the pressure at point a (Fig. 4.3) and the total flow rate of the first row sprinklers, the generalized characteristic of the first row is determined by the formula:

Since the second and third rows are identical to the first, after calculating the pressure loss between the first and second rows, the generalized characteristic is used to determine the flow rate of the second row. The consumption of the third row is calculated similarly.

The pressure of the fire pump, according to the diagram shown in fig. 4.3, consists of the following components:

Where P e— required fire pump pressure, MPa;

R in-g- pressure loss in the horizontal section of the pipeline, MPa;

R Mr.— pressure loss in the vertical section of the pipeline, MPa;

R M- pressure loss in local resistances (shaped parts), MPa,;

R yy- local resistance in the control unit (alarm valve, valves, gates), MPa;

R in— pressure at the dictating protected area, MPa;

Z- piezometric pressure (geometric height of the dictating sprinkler above the axis of the fire pump), MPa; Z = H/100;

P IN — pressure at the inlet of the fire pump (determined according to the option), MPa.

Object characteristics

According to the degree of risk of fire development, the building belongs to the 1st group (Appendix "B" SP 5.13130.2009):

Irrigation intensity - 0.08 l / (s * m2);

Area for calculating water consumption - 60 m2;

Duration of work - 30 min.

However, taking into account notes 3, 4 of Appendix "B" of SP 5.13130.2009, all storage facilities located in the building belong to the 2nd group:

Irrigation intensity - 0.18 l / (s * m2);

Estimated water consumption is not less than - 45 l / s;

Area for calculating water consumption - 120 m2;

Duration of work - 60 min.

A water-filled sprinkler installation is provided.

In accordance with the requirements of clause 4.1.6 of SP 10.13130.2009, for parts of buildings for various purposes, the need for an internal fire water supply and water consumption for fire extinguishing should be taken separately for each part of the building.

At the same time, water consumption for buildings that do not have fire walls should be taken according to the total volume of the building.

According to clauses 4.1.1, 4.1.4 and tables 1,2,3 of SP 10.13130.2009, the water flow rate for internal fire extinguishing from fire hydrants is taken:

For public premises, 2 jets with a flow rate of at least 2.6 l / s, while the diameter of the valve is 50 mm, the diameter of the spray barrel is 16 mm, the sleeve length is 20 m, the pressure at the fire hydrant is Yum.water.st.;

For warehouse premises, 2 jets with a flow rate of at least 5.2 l / s, while the diameter of the valve is 65 mm, the diameter of the barrel spray is 19 mm, the sleeve length is 20 m, the pressure at the fire hydrant is 24 m of water;

The internal network of fire hydrants is connected to the distribution manifold of the sprinkler system.

The free pressure of fire hydrants is provided in such a way that the resulting compact jet irrigates the highest part of the design room.

To ensure the operation of the installation, it is planned to install pumps, the start of which is provided for automatically, with remote duplication (for starting and stopping) from the premises of the fire post and the pump room.

Fire pump units have a 100% reserve and are installed in a separate room.

To connect the hoses of mobile fire pumps from the pressure line, between the pumps and control units, branch pipes with a diameter of 80 mm with check valves and standard connecting fire heads are brought out.

The installation uses a signal valve with a diameter of 100 mm.

Each floor is equipped with liquid flow detectors.

As sprinklers are accepted:

In warehouses, water sprinklers (with a flask of 5 mm) sprinklers of the TYCO company with a flat socket TY4251, 57°C, K=115 (0.61), installation with the socket down;

In the rest of the premises, water sprinklers (with a flask of 5 mm) sprinklers of the TYCO company with a flat socket TY3251, 57°C, K=80 (0.42), installation with the socket down.

The layout of sprinklers and their number are taken on the basis of providing the necessary intensity of irrigation in the protected premises. The distances between the sprinklers are accepted taking into account regulatory requirements, the design of the ceiling, the location of ventilation and fixtures.

The number of sprinklers on one control unit does not exceed 1200 pcs. (clause 5.2.3 of SP 5.13130.2009).

Calculation of the fire extinguishing installation

General provisions

We select the warehouse on the third floor as the dictating section.

The calculation of the distribution network is made from the condition of operation of all sprinklers (TY4251) mounted on the estimated area of ​​120 m and fire hydrants.

Taking into account the spray geometry of the used sprinklers, the number of sprinklers protecting the dictating zone with an area of ​​120 m2 is 16 pieces.

If the calculated flow rate from sprinklers located in the dictating section of the installation is less than 45 l / s, then the minimum standard value is taken into account - 45 l / s (clause 5.1.4, table 5.1 of SP 5.13130.2009 ).

3.2. Determination of the dictating head and flow

The specified intensity (0.18l/(s*m2)) for the area to be protected (according to the equipment layout - 9m2) with one sprinkler in the dictating section will be provided at a pressure at the sprinkler of 0.21 MPa.

Thus, the flow rate from the "dictating" sprinkler will be:

Q, \u003d 10 * K7P \u003d 10 * 0.61. V02l = 2.79l/s;

The pressure drop in the area between the first and second sprinklers will be:

p\-2 \u003d 4/50. QG * A-2 = 0-0078. 2.79: . 3.0 \u003d 0.001 8M7ya,

where A(15o - specific hydraulic resistance of the pipeline (with a nominal pipeline diameter of 50 mm), s2 / l6. Considering that the installation is usually operated for quite a long time without replacing pipelines, after a certain time their roughness will increase, as a result of which the distribution network is no longer will correspond to the design parameters in terms of flow and pressure.In this regard, the average roughness of the pipes is taken.

The diameter of the distribution rows is selected according to the number of sprinklers installed on them, given that the water velocity in them should not exceed 10m/s.

Full calculation can be downloaded after registration

1. Calculation of the sprinkler installation

The procedure for calculating sprinkler and deluge installations is as follows:

1. A group of premises is determined according to the degree of risk of fire development, which includes the designed premises, production or technological process.

For a fire load of 350 MJ m -2, we accept the 2nd group of premises.

2. The required parameters of a water or foam fire extinguishing installation are determined.

For the 2nd group of premises and extinguishing agent, we have:

Irrigation intensity J p, not less than 0.12 l/s m 2 ;

Area protected by one sprinkler damper F p; 12 m 2;

The duration of the installation, 60 min;

Distance between dampers, L with, 4 m.

3. The required performance of the sprinkler is determined by the formula:

,

l/s

4. The required productivity coefficient of the sprinkler is determined by the formula:

,

Where h- free head in front of the sprinkler, is assumed to be 5 m.

5. According to the calculated value of the required performance coefficient, the diameter of the sprinkler outlet is taken from the condition K > Cr. Accept K=0.71, then the diameter of the outlet will be 15 mm.

6. The pressure in front of the sprinkler (generator) is specified according to the formula:

,

m.

7. The number of sprinklers is determined by the formula:

Where m- number of rows;

n- the number of sprinklers in a row.

Where A And V- the length and width of the protected room from fire, A= 42 m; V= 14 m.

,

The number of sprinklers involved in the localization and extinguishing of the fire is determined:

9. A design scheme for a water fire extinguishing installation is being drawn up.

When developing a distribution pipeline routing scheme, it is necessary to strive to select such a scheme that would provide water supply with the least pressure loss in the network with the smallest possible pipe diameter.

The following option is accepted:

10. A hydraulic calculation of the water installation is being made.

Hydraulic calculation consists in determining the parameters of the main water supply depending on the height of the distribution pipelines with sprinklers, the free pressure at the "dictating" sprinkler and the pressure loss in the network in the area between the water feeder and the "dictating" sprinkler.

Rice. 1 Calculation scheme of the sprinkler installation.

Hydraulic calculations in the network are summarized in Table 1.

Table 1 Hydraulic calculation of the sprinkler installation

	Plots	l im	Nominal diameter d imm			Head loss at the uch - ke		Head in calc. points Ljm	Water consumption in calc. points qj l/s	Water consumption per account qi l/s

Why doesn't water extinguish?

Expert review of errors made during the hydraulic calculation of an automatic water fire extinguishing installation (AUVPT).

As often in attempts to optimize when designing, many "specialists" end up with a very inefficient water fire extinguishing installation.

This article presents some of the author's observations about the subtleties of the hydraulic calculation of water fire extinguishing installations and errors that must be avoided when conducting its examination. A partial analysis of the existing official calculation methodology and some conclusions from our own design experience are given.

1. Plots and graphs instead of calculations.

Many designers mistakenly determine the Pressure (P) on the dictating fill by calculation, depending on the Fill Coefficient of Performance (Kpr.) and the required Flow Rate (Q) of this fill. In this case, the required Consumption is taken by multiplying the normative intensity by the area protected by the sprinkler, which is indicated in the passport of this sprinkler.

For example, if the required intensity is 0.08 l/s per 1 sq. m., and the area protected by the sprinkler is 12 sq. m., then the sprinkler flow rate is assumed to be 0.96 l/s. And the pressure required on the sprinkler is calculated according to the formula P \u003d (d / 10 * Kpr.) l2.

This option would be correct if the entire volume of water leaving the sprinkler would fall only on its protected area and, at the same time, would be evenly distributed over the entire given area.

But in fact, part of the water from the sprinkler is distributed outside the area protected by the sprinkler. Therefore, in order to correctly determine the pressure on the dictating sprinkler, it is necessary to use only irrigation diagrams or passport data, which indicate what pressure must be created in front of the sprinkler in order for it to provide the required intensity in the protected area.

This requirement is specified in the 1st part of paragraph B.1.9 of Appendix "B" to SP 5.13130:

"...is determined taking into account the normative intensity of irrigation and the height of the sprinkler according to irrigation diagrams or passport data, the pressure that must be provided at the dictating sprinkler...".

2. Why is the dictating sprinkler not the main one?

The flow rate of the entire section is often taken by simply multiplying the minimum protected area (specified in table 5.1 of SP 5.13130 ​​for sprinkler AFS) by the standard intensity or simply by the minimum required flow rate indicated in tables 5.1, 5.2, 5.3 of SP 5.13130.

Although at present, in accordance with the calculation methodology set out in Appendix "B" to SP 5.13130, it is first necessary to correctly determine the flow rate of the most remote and high-lying sprinkler (dictating sprinkler), then calculate the pressure loss in the section from the dictated sprinkler to the next one, then taking into account these losses, calculate the pressure on the second sprinkler (after all, the pressure on it will be greater than on the dictating one). Those. it is necessary to determine the flow rate of each sprinkler located on the area protected by this installation. At the same time, it should be taken into account that the consumption of sprinklers installed on the distribution network increases with distance from the dictating sprinkler, because pressure on them also increases as they approach the location of the control unit.

Next, it is necessary to sum up the consumption of all sprinklers falling on the protected area for this group of premises and compare this consumption with the minimum (normative) flow indicated in tables 5.1, 5.2, 5.3 of SP 5.13130. If the calculated flow rate is less than the standard one, then the calculation must be continued (taking into account subsequent sprinklers placed on pipelines) until the actual flow rate exceeds the standard one.

3. Not all jets are the same...

The situation is similar when determining the costs of fire hydrants when designing a combined water fire extinguishing installation and an internal fire water supply system.

Primarily, the costs for fire hydrants are determined according to tables 1 and 2 of SP 10.13130, depending on the purpose of the object and its parameters (number of storeys, volume, degree of fire resistance and category). But in the second paragraph of clause 4.1.1 of SP 10.13130 ​​it is stated that "Water consumption for fire fighting, depending on the height of the compact part of the jet and the diameter of the spray, should be specified according to table 3."

For example, for a public building, 2 jets of 2.5 l / s were determined. Further, according to Table 3, we see that a flow rate of 2.6 l / s can be provided with a fire hose length of 10 m only at a pressure of 0.198 MPa in front of the fire hydrant valve DN65 and with a fire hose tip spray diameter of 13 mm. This means that the flow rate previously determined for each fire hydrant (2.5 l / s) will be increased to at least 2.6 l / s.

Further, if we have more than one fire hydrant (two or more jets), then by analogy with the calculation of a sprinkler installation, it is necessary to calculate the pressure loss in the section from the first (dictating) fire hydrant to the second. Then it is necessary to determine the actual pressure that the valve of the second fire hydrant will have, taking into account its geometric height, length and diameter of the pipeline. If the pressure is greater than on the first PC, then the flow rate of the second PC will be greater. And if the pressure is less, then it is necessary to perform the corresponding pressure correction on the first PC so that the pressure on the valve of the second PC corresponds to the previously accepted (updated) according to Table 3 of SP 10.13130.

If there are three or more involved fire hydrants (jets) in the system, then the calculation of such a system becomes more complicated at times and it is very laborious to carry it out manually.

4. Penalty for speeding.

When carrying out a hydraulic calculation of the AUVPT, it is important, in addition to calculating the main parameters (pressure and flow), to take into account several other significant parameters and make sure that they are also normal. For example, it is impossible to exceed the maximum speed of movement of water or a foaming agent solution in pressure (supply, distribution, supply) pipelines of more than 10 m / s, and in suction - more than 2.8 m / s.

It should be noted that the higher the rate, the higher the flow rate, which means that when calculating as you move away from the dictating sprinkler and approach the control node, the speed in the branches and rows will increase. Consequently, the diameters of distribution pipelines taken at the beginning of the calculation for branches with a dictating sprinkler may not pass the speed parameters for branches at the end of the calculated protected area.

5. This is our pantry, but we don’t store anything here at all.

In accordance with notes 1 and 2 of Appendix "B" to SP 5.13130:

"1. Groups of premises are defined by their functional purpose. In cases where it is impossible to select similar production facilities, the group should be determined by the category of the premises.

With this, everything seems to be clear and, as a rule, does not raise questions. However, further note 3 states that if the warehouse is built into a building whose premises belong to the 1st group, then the parameters for such (warehouse) premises should be taken according to the 2nd group of premises.

For example, in a shopping center or an ordinary store, the 2nd group may include the so-called pantries, utility rooms, wardrobes, linen and other storage rooms, in which the value of the specific fire load is from 181 to 1400 MJ / m2. (VZ category).

Therefore, if the specified rooms of different groups are protected by one fire extinguishing section, then the designer must first make a calculation for all rooms of the 1st group, then separately calculations for each room of the 2nd group, then select the dictating parameters of this section and do not forget to adjust the pressure and consumption for design sections that are not dictating.

By the way, further in note 4 it is indicated that if the room belongs to the 2nd group of rooms, and the value of the specific fire load is more than 1400 MJ / sq. m. or more than 2200 MJ/m2, then the intensity of irrigation should also be increased by 1.5 or 2.5 times, respectively. This case is more related to industrial protection facilities, but requires that, with the calculation of water fire extinguishing, the calculation of the categories of premises for explosion and fire hazard is carried out in parallel.

6. And this pipe can be ignored ...

A very rare practice

This is a calculation of pressure losses in the supply pipeline (from the control unit to the fire pump discharge pipe). As a rule, the calculation is usually carried out at best up to the control unit, although, depending on the diameter of the supply pipeline and the number of control units installed on it, pressure losses in this section can be quite significant.

7. By leaps and bounds.

Often mistakenly, the maximum distance between sprinklers is taken from Table 5.1. SP 5.13130, i.e. 4 or 3 meters respectively. However, to ensure uniform irrigation, the maximum distance between the sprinklers (when they are arranged in a square) should not exceed the side of a square inscribed in a circle formed by the area protected by the sprinkler. For example, with a protected area of ​​​​12 square meters. the estimated distance between the sprinklers will be only 2.76 meters.

8. Three hundred in one glass.

The calculation of the number and throughput of nozzles for connecting mobile fire equipment (fire trucks) is not made, taking into account the maximum flow rate issued by one fire truck per one such nozzle. The bottom line is that a standard fire truck (for example, an AC-40 (130) tank truck) has a centrifugal pump with a flow rate of 40 l / s, but it can only deliver this flow rate through two pressure pipes (20 l / s each). Even a fire monitor carried on a tank truck with a flow rate of 40 l / s is also connected to the vehicle through two fire hoses.

9. The fire may not be in the furthest room.

No comparison is made between the required flow and pressure depending on the location of the calculated protected area. It is necessary to consider at least two options: in the most remote part of the section (as indicated in the method of SP 5.130130), and, conversely, in the one located directly near the control node. As a rule, in the second case, the consumption is more.

10. And finally, again about the drencher curtain ...

Drencher curtains connected to the pipelines of a sprinkler fire extinguishing installation are rarely calculated in full, and their consumption is formally taken at the rate of 1 l / s per 1 m of such a curtain. At the same time, the distances between deluge sprinklers are also taken to be unreasonable and without taking into account the mutual action of neighboring sprinklers on each protected point. Here, as in the calculation of a sprinkler installation, it is necessary to take into account the increase in the flow rate of each sprinkler when moving away from the dictating one (towards the location of the control unit), sum up these costs, and then correct the resulting flow rate taking into account the actual pressure at the point of connection of the deluge curtain pipeline with the common piping system installation.

This video demonstrates and analyzes 10 common mistakes that are made during the hydraulic calculation of water fire extinguishing installations. Video in two parts. The total duration is about 1 hour.

The sprinkler system of water fire extinguishing is practical and functional. It is used in entertainment facilities, commercial and industrial buildings. The main feature of sprinkler lines is the presence of sprinklers with polymer inserts. Under the influence of high temperatures, the insert fuses, activating the fire extinguishing process.

Scheme of a sprinkler fire extinguishing system

The structure of a typical system includes the following elements.

• control modules.
• Pipeline.
• Sprinkler sprinklers.
• control module.
• Gate valves.
• impulse module.
• Compressor equipment.
• Measuring instruments.
• Pumping plant.

When calculating fire extinguishing systems, the parameters of the room (area, ceiling height, layout), requirements of industry standards, requirements of the technical assignment are taken into account.

Calculation of water sprinkler installations must be carried out by qualified specialists. They have specialized measuring instruments and the necessary software.

System Benefits

Sprinkler fire extinguishing systems have many advantages.

• Automatic activation in the event of a fire.
• Simplicity of basic working schemes.
• Maintaining performance over a long period of time.
• Serviceability.
• Acceptable cost.

System Disadvantages

The disadvantages of sprinkler systems include.

• Dependence on the regular water supply line.
• Impossibility of application on objects with a high degree of electrification.
• Difficulties when using in conditions of negative temperatures (requires the use of air-water solutions).
• Unsuitability of sprinklers for reuse.

An example of the calculation of a sprinkler installation of water fire extinguishing

The hydraulic calculation of the sprinkler fire extinguishing system allows you to determine the operating pressure indicators, the optimal pipeline diameter and line performance.

When calculating sprinkler fire extinguishing in terms of water consumption, the following formula is used:

Q=q p *S, where:

• Q is the performance of the sprinkler;
• S is the area of ​​the target object.

Water flow is measured in liters per second.

The calculation of the performance of the sprinkler is made according to the formula:

q p = J p * F p , where

• J p - irrigation intensity established by regulatory documents, in accordance with the type of premises;
• F p is the coverage area of ​​one sprinkler.

The fill efficiency factor is presented as a number, not accompanied by units.

When calculating the system, engineers determine the diameter of the sprinkler outlets, the consumption of materials, and the optimal technological solutions.

If you need a calculation of a sprinkler fire extinguishing system, contact the staff of "Teploognezashchita". Specialists will quickly cope with the task, provide recommendations on solving typical and non-standard issues.