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Design manual for external stored pressure HFC-227ea extinguishing system




    The introduction of the external pressure type 7 fluoropropane fire extinguishing system

Outside storage pressure type of seven fluorin propane fire extinguishing system (aka for pressure type of seven fluorin propane fire extinguishing system) based on GB530370-2005 specification for design of gas fire extinguishing system and GB25972-2020 gas fire extinguishing systems and components, NFPA - 2000, China engineering construction standardization association standard CECS 386:2014 outside storage pressure of seven fluorin propane fire extinguishing system as the basis, such as technical specification will be seven fluorin propane fire extinguishing agent with liquid stored in the container, do not use nitrogen pressure, pressure storage is only agent of saturated steam pressure, while the power for the agent application power gas at a higher pressure is stored in another container. System is working, high pressure power gas after decompression by pressure-relief devices into fire extinguishing agent storage bottles, dynamic gas driving agent high speed movement along the pipeline network system, within the prescribed period of time from the nozzle jet, implement discharge fires.




The main difference between the external pressure gas extinguishing system and the internal pressure gas extinguishing system


The driving pressure of the extinguishing agent and the state of the pressure and the state of the extinguishing agent are the determinants of the distance of the fire-extinguishing agent。 Fire extinguishing agents promote the greater the pressure the more persistent, fire extinguishing agent transport distance is more far, in addition in the pipe of fire extinguishing agents exist in liquid form cases than in the quality of the gas liquid two phase cases velocity is larger, the bigger the mass flow rate per unit time the greater the flow。 The mass flow rate is defined as the mass flow of the fluid within the unit time of the unit, i。e。 the mass flow of the unit's circulation area, which is usually expressed in G, and the unit is Kg/(m squared * s)。 Calculation of mass flow rate: G = W/A, where W is mass flow, and the unit is Kg/s; A is the area of circulation, the unit is m squared。

Storage pressure within the gas extinguishing system because the nitrogen is with seven fluorin propane fire extinguishing agent storage and in the same the cylinder pressure, so there must be a part of the nitrogen dissolve into seven fluorin propane fire extinguishing agent, when the transmission of seven fluorin propane fire extinguishing agent within the pipes, the cylinder and the pipe pressure falling at any time, dissolved with N2 of seven fluorin propane fire extinguishing agent released steam, produce large amounts of gas, produced in the pipe forming airbags and two-phase flow phenomenon, a direct impact on the flow performance of fire extinguishing agent, affect the traffic agent.

Outside storage pressure type gas fire extinguishing system is of seven fluorin propane fire extinguishing agent and as push high-pressure nitrogen stored in different cylinders respectively, only in need agent application of nitrogen through the relief valve into the fire extinguishing agent storage cylinder pushing agent application. So in the outside storage pressure type gas fire extinguishing system, because of the high pressure nitrogen and seven fluorin propane fire extinguishing agent contact time is shorter, so almost no nitrogen gas dissolved in the middle of seven fluorin propane fire extinguishing agent, so that greatly reduce the degree of the gas liquid two phase flow and single phase of seven fluorin propane liquid can obtain larger mass velocity.

Outside storage pressure type gas fire extinguishing system for pressure driven nitrogen storage alone, can provide more power, chemicals in the casting process, external pressure type storage of nitrogen gas fire extinguishing system can provide continuous of seven fluorin propane medicament cylinders and maintain a relatively higher than the average pressure of traditional drug delivery system, the constant impetus of the teacher's ethics outside storage pressure type gas fire extinguishing system for the quality of the higher velocity.

Therefore, the external pressure gas extinguishing system can carry farther distance than the internal stored-pressure gas extinguishing system。



The external pressure system has the following characteristics

2.5 Mpa level external pressure system is suitable for the protection of the transmission distance of more than 45 meters, as far as 370 meters;

● In the pipeline network, the extinguishing agent is flowing in liquid, so it can be used as a vertical diversion in the pipe network。

The pressure of the external storage pressure system is smaller than the internal storage pressure, which has a significant effect on reducing the cost of the pipe network.

The pressure of the external pressure system of the external pressure system at the level of 2.5mpa was the lowest, which was 4.2 Mpa * 1.15 = 4.83 Mpa.

The external storage system can directly utilize the pipe network of the original 1301 system to reconstruct the project;

The nozzle inlet pressure is high, improve the atomization effect of extinguishing agent, shorten the discharge time of the extinguishing agent, accelerate the fire fighting, and improve the fire-fighting efficiency。

It is more suitable for long-distance transportation and large space protection area.

The noise is small, the network is small and the impact is small.



    Contrast between internal pressure and external pressure

    The source of the pressure
   The stored pressure
    The stored pressure
    System rated working pressure
4.2Mpa
5.6Mpa
2.5Mpa
4.2Mpa
    Pressure curve
 Step-down process
 Step-down process
The early stage of the booster→The medium term is long and steady
The early stage of the booster→The medium term is short
    Transmission distance
45m
55m
370m
220m
    Pipe size
big
big
small
small
    Thick wall pipe
 4.2Mpa level
5.6Mpa level
Level of 2.5 Mpa
Level of 4.2 Mpa
    Test of piping strength
7.705Mpa
8.28Mpa
4.83Mpa
7.705Mpa
    Gas reserve

五人斗地主 Reserve small

Suitable for large protective areas
    Harlong system is compatible
Are not compatible
Are not compatible
 Compatible with
Are not compatible
    Pipeline noise
big
A bigger
small
big
    The effects of agent spray on maintenance structure damage
big
A bigger
    small    
big
    Reagent measurement
/
/
Level gauge
Level gauge


2.5 Mpa type external pressure curve of the external storage pressure system

The pressure curve in the container


4.2 pressure curve of the external storage pressure system of the Mpa type

The pressure curve in the container


It can be seen from the figure above that the external storage pressure system of 2.5mpa type is compared with the external storage pressure system of 4.2 Mpa type, the former is more capable of providing more stable time and transport distance; The other is more nitrogen utilization than the latter, which is about 272L.



    The axial test of the gas fire pipe network is divided into the external storage pressure




    Schematic diagram of the gas fire extinguishing system of the external stored-pressure type 7 fluoro-propane mixture 




    System technical parameters 



    Product model
QMQ-2.5-180W-SAXF
   System rated working pressure
2.5Mpa
    Volume of fire extinguishing agent
180L
    Power drive cylinder volume
70L
    Nitrogen drive volume
4L
    Storage pressure of extinguishing agent bottle
≤1Mpa
    Power drive bottle storage pressure
≤12Mpa
    Nitrogen drive plant storage pressure
6Mpa
    Filling density
1230Kg/m³
    Maximum capacity of extinguishing agent
220Kg/bottle
    Operating temperature range
0°C~50°C
    Injection time
≤10s
    Nozzles are nominal working pressure
0.6~2.0Mpa
    Height of nozzle protection
0.3-6m
    System startup mode
Automatic, electric manual, mechanical emergency manual three control modes
    System extinguishing system
Total flooding
    System package
Unit independence and portfolio allocation
    System startup power
24V,1.5A
    Safety relief device movement pressure
5.6±0.28Mpa
    Extinguishing agent bottle test
Pressure gauges and level gauges
    Power drive bottle group testing
Pressure gauge
    Nitrogen driving device detection
Pressure gauge
    Pressure vessel seal form
Diaphragm seal
    Color of extinguishing agent bottle group
red
    Power drive bottle group color
black
    Nitrogen driving device color
black
    Pressure strength test of pipe network
4.83Mpa

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