In recent years，Industrial、Economic comprehensive development，The increase in oxygen dosage is also increasing。And big households with oxygen，Oxygen pipelines are often used in oxygen pipelines。
but，Because of the tube、Distributed，Coupled with frequent emergency or quick-closed valves，There is an accident in the accident of oxygen pipe and valve burning explosion，This is also a headache that makes many people and concerns.。
so，Only the hidden dangers in oxygen pipes and cold doors、Danger，And take corresponding measures，Is the upright policy。
Oxygen pipe selection
1. Pipe selection
From temperature conditions，Oxygen pipelines in normal temperature conditions generally use steel pipes。
(bending thin brass tube)Considering the pressure conditions，Work pressure is greater than3MPA's oxygen pipes use brass tubes or purple copper tubes；Pressure is less3Mida's words，Seamless steel pipe。2. Pipe pipe selection
(bending thin brass tube)The elbow on the oxygen pipe is strictly forbidden to use a wrinkle elbow.。When using cold or hot bending carbon steel elbow，The bend radius should not be less than the outer diameter5Multiplication；When using seamless or pressed welding carbon steel elbow，The bend radius should not be less than the outer diameter of the tube1.5Multiplication；When using a copper-based alloy seamless or pressed elbow，The bend radius should not be smaller than the outer diameter of the tube。(bending thin brass tube)Variable tube of oxygen pipeline，To use seamless or pressed welded。Bifurcation head of oxygen pipeline，Seamless or pressing welds should be used。But when it is really unable to get，Should be prefabricated in the factory or on-site，It is best to processed to ignorant、No protrusion and solder tumor。
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At the same time all flanges used，It must be selected according to the current standard standard。
Oxygen valve selection
1. Valve type
Valves on the oxygen pipe should be used for oxygen special valves，Interpretable valve on domestic oxygen pipelines，The direction of ordinary valve media is downward。
(bending thin brass tube)Under oxygen conditions，Valve flow paths are different from ordinary valves，Choose，Ensure that the valve bar is good，And the spool is quickly closed。2. Valve body material
3MPaIt is best to use stainless steel quality below.；exist3MPaIt is best to choose fromInconel 625 orMonel 400 alloy steel。
(bending thin brass tube)Shaanxi Weiliang Inspection Co., Ltd.3. Valve inner material
Conventionally doing oxygen valve interior partsInconel and Monel；in addition，Best valve internal partsInconel 625Add surface hardening；Valve stem/Solder material selectionInconel X-750orInconel 718。
Valve try not to make irradiation process，Keep the same caliber with the original pipeline；And the valve core valve is not suitable for hardening solder.，Because of the surfacing limit，Easy to produce certain unsafe factors；
Valve sealing ring material selection of oil-free paste graphite（Low carbon）；
Top valve cover is used for double packing，Filler uses high temperature-resistant grease graphite（Can withstand468℃）；
In addition, the fins of the valve inside the surface must be reachedISO 8051-1 Sa2Demand。
Cause Analysis of Common Combustion Explosion
1、Rust in the pipe、dust、Sewage slag and pipe inner wall or valve mouth friction produces high temperature combustion。
analyze：Types with impurities、Particle size and airflow speed，Iron powder is easy to combust to oxygen，And the finer granularity，The lower the burning point，The more you use burning。
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2、Pipeline or valve、Rubber and other low-combing materials，Ignition at a local high temperature。
Flammable Name | (bending thin brass tube)Burning point（℃） |
lubricating oil | (bending thin brass tube)273~305 |
| (bending thin brass tube)Steel pad | 304 |
| (bending thin brass tube)rubber | 130~170 |
fluororubber | 474 |
Trichloro | 392 |
PTFE | 507 |
3、High temperatures produced by heat-insulating compression make combustible
analyze：Can give you such an example，If the valve is15MPa，Temperature20℃，The valve is normal pressure0.1MPa，If the valve is turned quickly，The oxygen temperature after the valve is calculated according to the thermal compression formula.553℃，This has reached the fire point of even more than some substances.。
4、Reduced oxygen pipe valve combustion in high pressure pure oxygen can also induce oxygen pipe valve combustion。
Oxygen pipes and valves in high pressure pure oxygen，Its danger is very large，Continuous test prove，The detonation energy of fire is inversely compared with the pressure square，This has a great threat to oxygen pipes and valves.。
What should I prevent？
(bending thin brass tube)1、All design should comply with relevant regulations、standard regulationIn design1981Annual Metallurgical Department《Some provisions of the oxygen pipe network of steel enterprises》as well as《Oxygen and related gas safety technical procedures》（GB16912-1997）、《Oxygen station design specifications》（GB50030-91）The requirements of regulations。
（1）Maximum flow rate sheet for oxygen in carbon steel pipe
Work pressure（MPa） | (bending thin brass tube)≤0.1 | 0.1~0.6 | 0.6~1.6 | 1.6~3.0 |
Flow rate（m/s） | (bending thin brass tube)20 | 13 | 10 | 8 |
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