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Flame arrester

Gas flame arrester

Gas flame arrester

Natural gas flame arresters are designed and manufactured based on the principle that flames extinguish due to heat loss when passing through narrow pores in thermal conductors. Suitable for storage and flare systems, gas purification systems, gas analysis systems, coal mine gas emission systems, heating furnace fuel gas pipelines for combustible gas pipelines, such as gasoline, kerosene, light diesel, benzene, methyl benzene, crude oil and other oil products, as well as pipeline supplies for acetylene, oxygen, nitrogen, and natural gas. This valve can be used in conjunction with a breathing valve or as a standalone device.

  • Item NO.:

    XUVAL-385
  • Lead Time:

    45
  • Product Orgin:

    CHINA
  • Brand:

    XUVAL
  • Shipping Port:

    Shang hai
  • Payment:

    100%
  • Color:

    Red
  • MOQ:

    1
Products Details
Natural gas flame arresters are designed and manufactured based on the principle that flames extinguish due to heat loss when passing through narrow pores in thermal conductors. Suitable for storage and flare systems, gas purification systems, gas analysis systems, coal mine gas emission systems, heating furnace fuel gas pipelines for combustible gas pipelines, such as gasoline, kerosene, light diesel, benzene, methyl benzene, crude oil and other oil products, as well as pipeline supplies for acetylene, oxygen, nitrogen, and natural gas. This valve can be used in conjunction with a breathing valve or as a standalone device. Gas flame arresters (natural gas flame arresters, hydrogen flame arresters, acetylene flame arresters) are designed and manufactured based on the principle of extinguishing flames due to heat loss when passing through narrow pores in thermal conductors. The flame retardant layer structure of natural gas hydrogen flame arresters is either a metal wire mesh type or a corrugated plate type. Suitable for combustible gas pipelines, such as storage and flare systems for gasoline, kerosene, light diesel, benzene, methyl benzene, crude oil and other oil products, gas purification and purification systems, gas analysis systems, coal mine gas emission systems, and heating furnace fuel gas pipeline networks. This valve can be used in conjunction with a breathing valve or as a standalone device; The gas flame arrester mainly consists of a shell and a filter element. The shell should have sufficient strength to withstand the impact pressure generated by the explosion. The corrugated flame retardant plate is made of stainless steel and copper nickel alloy. Ripple type flame arresters can prevent violent flames of deflagration and withstand corresponding mechanical and thermal effects. They have low flow resistance and are easy to clean and replace.

The main performance of gas flame arresters:
(1) The explosion resistance performance is qualified, and it can withstand fire for 13 consecutive explosion resistance tests.
(2) The fire resistance performance is qualified, and there is no tempering phenomenon in the fire resistance test for 1 hour.
(3) The shell water pressure test is qualified. This product has a reasonable structure, light weight, and corrosion resistance. Easy to maintain and install. The core of the flame arrester is made of stainless steel material, which is corrosion-resistant and easy to clean.

Specification and size of gas flame arrester:

DN

Size

L/mm H/mm
20 3/4" 125 182
25 1" 130 195
32 1-1/4" 150 208
40 1-1/2" 170 220
50 2" 190 240
65 2-1/2" 205 250
80 3" 220 260
100 4" 240 275
125 5" 280 300
150 6" 330 325
200 8" 385 365
250 10" 450 405
300 12" 520 440
350 14" 595 465
400 16" 665 495
450 18" 710 525
500 20" 780 565

Technical parameters of natural gas flame arresters:

Model ZHQ-Q  Explosion group BS 5501: IIA IIВ IIС
Size
DN 15-600 GB 81~59
PN 0.6-2.5  FF、 RF
 Bolt/Nut 20# 304 304L 316 316L
Body A3 304 304L 316 316L  Diaphragm(P/V) NBR PTFE Metal Gasket
Flame Arrestor 304 304L 316 316L  Ambient Temperature
CS:-30°C ~ +350 °C
SS: -80°C ~ +480°C
Manufacture inspection GB5908-86 GB/T13347-1992 Jonit type  Flange   Threaded
Coating CS:Paint  SS:No paint  Flanges HG GB SH HGJ JB ANSI JIS

There are currently two main views on the working principle of natural gas flame arresters: one is based on heat transfer; One is based on the wall effect.

1. One of the necessary conditions for heat transfer and combustion is to reach a certain temperature, which is the ignition point. Below the ignition point, the combustion will stop. According to this principle, as long as the temperature of the burning substance is lowered below its ignition point, it can prevent the spread of flames. When the flame passes through many small channels of the flame arrester, it will become several small flames. When designing the internal flame arrester components, efforts should be made to expand the contact area between the small flame and the channel wall as much as possible, enhance heat transfer, and lower the flame temperature below the ignition point, thereby preventing flame propagation.

2. The wall effect combustion and explosion are not direct reactions between molecules, but are stimulated by external energy, causing the breakdown of molecular bonds and the generation of activated molecules. The activated molecules then split into short lived but very active free radicals, which collide with other molecules to produce new products and generate new free radicals that continue to react with other molecules. When the combustible gas passes through the narrow channel of the flame retardant element, the probability of collision between free radicals and the channel wall increases, and the number of free radicals participating in the reaction decreases. When the channel of the flame arrester is narrow to a certain extent, the collision between free radicals and the channel wall dominates. Due to the sharp decrease in the number of free radicals, the reaction cannot continue, that is, the combustion reaction cannot continue to propagate through the flame arrester.

3. The maximum experimental safety gap MESG value, where the flame passes through the small channel of the flame arrester and cools down inside the channel. When the flame is divided to a certain extent, the heat removed through the channel is enough to lower the temperature below the ignition point of the combustible material, causing the flame to extinguish. Or explained by the wall effect, when the channel is narrow to a certain extent, the collision between free radicals and the pipeline wall dominates, and a significant reduction in free radicals prevents the combustion reaction from continuing. Therefore, the channel size that can precisely extinguish the flame under certain conditions (0.1 MPa, 20 ℃) is defined as the Maximum Experimental Safety Gap (MESG). The channel size of flame arresters is a key factor determining their performance, and different gases have different MESG values. Therefore, when selecting a flame arrester, its MESG value should be determined based on the composition of combustible gases. When making specific choices, the gas is divided into several levels based on the MESG value. Currently, two types of methods are commonly used internationally. One is the classification system of the National Electrical Council (NEC) in the United States, which divides gases into four levels (A, B, C, D) based on their MESG values; Another type is the method of the International Electrotechnical Association (IEC), which also divides gases into four levels (IIC, IIB, IIA, and I). The MESG values and test gases for each type of gas divided by two standards are shown in Table 1.

Two classification standards for MESG

NEC IEC  MESG/MM Test gas
IIC 0. 25 acetylene
B IIC 0. 28 hydrogen
IIB 0. 65 ethylene
D  IIA  0. 90 propylene
G M I  1. 12  methane
In this way, when selecting a natural gas flame arrester, the grade of the combustible gas used can be first identified in the design specifications, and then the corresponding flame arrester element can be selected based on the MESG value corresponding to that group of gases.


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