Discussion on technical requirements and measures related to safety , sealing and fire extinguishing performance of “One Belt, One Road†export project of gas fire extinguishing system products
Zhu Jinwu Zhou Tiexiang
(Beijing Lida Hai Xin fire extinguishing system Equipment Co., Ltd., Beijing, Tel)
I. Summary
The gas fire extinguishing system product export project is also called the gas belt fire extinguishing system "Belt and Road" export project referred to as gas fire extinguishing system export or gas fire extinguishing equipment export. The gas fire extinguishing system is one of the four traditional fixed fire extinguishing systems (spray, gas, foam, dry powder), and has a wide range of applications. The gas fire extinguishing system has the following characteristics: First, the insulation performance is good, and the electric fire can be extinguished; second, the fire extinguishing agent is clean, there is no residue in the fire extinguishing process and after the fire extinguishing; the third is the fast fire extinguishing speed. The “One Belt and One Road†export project of gas fire extinguishing system products (also called gas fire extinguishing system export project referred to as gas fire extinguishing system export) is to export gas fire extinguishing system products to foreign countries, install them in the gas fire extinguishing system protection zone, and implement automatic fire prevention and fire extinguishing protection. Achieve fire protection for key foreign projects or important equipment. The gas fire extinguishing system is required to be safe and reliable, has good sealing performance, good fire extinguishing performance, and the box is resistant to collision, vibration, high and low temperature, stable quality, correct design parameters, and requires simple and quick installation and construction.
Second, the keyword
Gas fire extinguishing system "Belt and Road" export project, gas fire extinguishing system export project, gas fire extinguishing system export, gas fire extinguishing equipment export. Safe and reliable, good sealing and good fire extinguishing performance.
Third, the technical requirements and measures for the "One Belt, One Road" export project of gas fire extinguishing system products
1, the product is safe and reliable
The gas fire extinguishing system product export project (also called the gas belt fire extinguishing system "Belt and Road" export project referred to as gas fire extinguishing system export or gas fire extinguishing equipment export) must be safe and reliable. Try to use domestic brand products with high reputation, eliminate the use of unqualified fire-fighting chemicals, short and short parts and unqualified parts. All should proceed from the safety of users to ensure the "One Belt and One Road" export project of gas fire extinguishing system products (also called gas). The export system of fire extinguishing system is referred to as the export of gas fire extinguishing system or the export of gas fire extinguishing equipment. It is safe and reliable in transportation, installation and use.
(1) Pressure vessel cylinders should be made of products produced by well-known manufacturers. They have the pressure vessel certificate issued by the state. The wall thickness and weight of the pressure vessel cylinders fully meet the requirements of the design drawings and the Code. Pressure vessel cylinders with sub-standard thickness, light weight, unqualified materials and low cost must not be used. In gas-fired system pressure vessel cylinders, heptafluoropropane cylinders are most likely to be falsified. For example, steel cylinders with thin wall thickness and non-standard are used, and the weight difference is 20% to 30%; or the steel bottle material is not made of pressure vessel steel plate, and ordinary hot-rolled steel plate is used. Can reduce the cost of cylinders by 10% to 30%.
(2) The safety relief device of the container valve on the pressure vessel cylinder should adopt the safety diaphragm produced by Shanghai Huali Safety Valve Professional Co., Ltd. The cost of the product is generally around 20 yuan, and the safety performance can be guaranteed. Some manufacturers design and process safety diaphragms themselves. The cost of the products is less than 2 yuan, and the safety performance is difficult to guarantee.
(3) Safety protective caps shall be installed at the outlets of the fire extinguishing agent container valves in the gas fire extinguishing system, so that the products can ensure the operator even in the series of processes such as production, transportation, loading, unloading, installation and commissioning, even if the fire extinguishing agent cylinder is activated by mistake. Personal safety. In order to reduce the cost of the product, there are many manufacturers that the valve outlet is not equipped with a safety helmet.
(4) The container valve on each pressure vessel cylinder should be forged by HPb59-1(Y) cold drawn brass rod, so that the container valve material has a streamlined flow structure and the density increases. This not only increases the tensile strength but also enhances the toughness. The container valve will not break after being impacted. Bottle head valves for casting stainless steel and carbon steel should be never used at a low cost. Fire-fighting valve is the core and most important component of gas fire-extinguishing system products. It is related to the two key functions and performances of product safety and sealing. Ningbo Sanan Valve Company's fire-fighting valve is reliable in quality and is one of the most professional manufacturers of fire-fighting valves. .
(5) Strictly put gas fire-extinguishing parts into the factory, production, and finished product inspection, so that users can use the peace of mind and peace of mind.
2, good sealing, no leakage, long service life
The parts used in the “One Belt and One Road†export project of gas fire extinguishing system products (also called gas fire extinguishing system export project referred to as gas fire extinguishing system export or gas fire extinguishing equipment export) must have good sealing performance and stable quality. The following points should be ensured that the “One Belt and One Road†export project of gas fire extinguishing system products (also called gas fire extinguishing system export project referred to as gas fire extinguishing system export or gas fire extinguishing equipment export) is well sealed and stable in quality.
(1) The material of the fire extinguishing agent bottle group container valve of the gas fire extinguishing system should be forged and formed by cold drawn brass rod. Even if it is stored for a long time, it is not easy to corrode and rust, and the opening is flexible and reliable. The microstructure of the copper container valve after forging is fine in shape and density, and the sealing performance of the fire extinguishing agent container valve is long and reliable. Overcoming the use of low-cost casting stainless steel material processing container valve, there are different solidification temperature and shrinkage rate and impurities in the cooling process of the casting; the internal and surface are prone to some small thermal cracking, looseness, porosity and other problems, Major defects such as poor sealing performance of the container valve.
(2) Extinguishing agent bottle group container valve sealing port and connection of various parts, it is recommended to adopt radial and end face double sealing structure. The sealing material is made of corrosion-resistant and high-temperature resistant materials, so that the sealing effect is double protected.
(3) Different filling process of gas fire extinguishing agent in fire extinguishing agent bottle group, the filling process of fire extinguishing agent can greatly improve the qualified rate of one-time air tightness test of fire extinguishing agent bottle group by more than 99%, which is conducive to the leakage of fire extinguishing agent storage bottle. The storage period is long, and the maintenance cost of the user is lowered and the safety of the user is improved.
(4) The airtightness test of the container valve and the extinguishing agent bottle group should be strictly controlled. After filling, the fire extinguishing agent bottle group should be immersed in clean water for air tightness test. It should be no less than twice, and each test should be no less than 10 minutes. No bubble leakage is acceptable. This kind of immersion in clean water to test the extinguishing agent bottle group sealing test is simple, clear and reliable. At present, many gas manufacturers do not do this. The fire extinguishing agent bottle group is all immersed in water for air tightness test. Generally, a brush is used to apply the soap liquid to the valve connecting thread to see if these parts are bubbling. It is difficult to find out whether the cylinder leaks. Sealing quality is difficult to guarantee.
(5) Gas fire extinguishing system The front end of the pressure gauge should be designed with a pressure gauge switch structure. The pressure gauge switch should be simple and reliable to operate. The pressure gauge and pressure gauge should be connected with high-strength, high-precision, high-sealing dry American-made cone. Threads and sealing performance are more reliable.
(6) One end of the high-pressure connecting hose is connected to the outlet of the fire extinguishing agent bottle container valve, and the other end is connected with the liquid flow check valve on the collecting pipe to make a steering connection, and the fire extinguishing agent is transmitted and the gas is released to cause vibration and impact. The high-pressure connecting hose has two structures: one is a steel joint at both ends of the hose, one of which is a 90° elbow, and the flexible hose is partially in the middle straight pipe, and the high-pressure connecting hose of the structure is adjusted in height direction. The amount is very small, and it is required that the cold-worked welding agent fire extinguishing agent bottle frame has high processing precision and is difficult to connect. It will result in poor sealing performance and vibration, and leakage when the fire extinguishing agent is sprayed. The other end of the high-pressure connecting hose is a short-distance stainless steel joint. The length of the flexible hose can be adjusted in both directions of X and Y axes. The connection is fast and labor-saving, and the connection sealing performance is good. The vibration of the whole gas fire-extinguishing system equipment is small.
(7) In the starting pipeline of the pipe network gas fire extinguishing system, a low-pressure safety leak valve, also called a low-flow high-sealing valve, should be installed to prevent the system from being accidentally started due to slow leakage of the gas starting device, thus effectively ensuring product quality.
3, good fire extinguishing performance
The fire extinguishing performance of gas fire extinguishing system (gas fire extinguishing equipment) is good or bad, mainly related to the sealing and pressure values ​​of fire extinguishing agent and fire extinguishing agent bottle set and the correctness of system design scheme parameters.
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