For oxygen (liquid oxygen) pipelines, how is the fire hazard of the medium classified?
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I have a few questions regarding oxygen (liquid oxygen) pipelines, and I would like to ask the experts in this field for their advice. 1. How is the fire hazard of oxygen or liquid oxygen media classified? Is it Category A or Category B? I noticed in the reply from the General Administration of Quality Supervision that oxygen pipelines are classified as Category B flammable media. But how should we understand the definition in GB 50016 of \"substances that can cause combustion or explosion when subjected to impact, friction, or contact with oxidizers or organic substances\"? 2. Do pipelines carrying oxygen or liquid oxygen need to undergo a leak test? The regulations stipulate that pipelines carrying media with extremely high toxicity, high hazard levels, or flammable fluids must undergo leak testing. Is the oxygen pipeline (oxidizing gas) considered a flammable fluid? There’s some disagreement with a colleague. Personally, I think a leak test is necessary. 3. The GB 50030-2013 Code for Oxygen Stations specifies that oxygen pipelines must undergo a tightness test. Its pressure is the design pressure. This tightness test is nothing other than a leak test! Although the wording differs slightly from the regulations. Gurus, what do you think?
This post was last edited by WuduBuZhangfu on 2018-7-7 at 12:18. Sorry, the explanation regarding the first point was incorrect. 1. The substances referred to as “substances that can cause combustion or explosion when subjected to impact, friction, or contact with oxidizers or organic materials” are substances such as phosphorus pentasulfide and phosphorus trisulfide. Oxygen itself is an oxidizing gas. During transportation, oxygen comes into contact with residual grease, iron oxide particles, or other combustible small particles present in the device; friction and collisions that occur as a result generate heat ； Or adiabatic compression or expansion may occur during sudden changes in the cross-sectional area of the pipeline, which can lead to combustion or explosion. Therefore, degreasing and purification treatment are required for the valves of oxygen pipelines. After the oxygen pipeline is installed, it must also undergo a thorough degreasing process. 2. All pressure pipelines must undergo a leak test
Therefore, oxygen should be classified as a Class A medium. Right?
Oxygen is a combustion-supporting gas, and its fire hazard is classified as Category B. The standards for the design, construction, and inspection of oxygen pipelines are just as strict as those for flammable and explosive substances~~
Oxygen is an oxidizing gas, and its fire hazard classification is Class B
How should we understand “substances that can cause combustion or explosion when subjected to impact, friction, or contact with oxidizers or organic substances”? I saw the reply from the General Administration for Quality Supervision, which also stated that oxygen belongs to Category B. Are there any relevant documents or standards indicating that oxygen belongs to Category B? If it follows Category A, Article 6, it should be classified as Category A, right?
Thank you for taking the time to answer. I would like to ask again: the substances referred to as “substances that can cause combustion or explosion when subjected to impact, friction, or contact with oxidizers or organic materials” are substances such as phosphorus pentasulfide and phosphorus trisulfide. ”Is there a source for this?
Article 6 of Category A seems to emphasize the flammability of the substance itself~~ while oxygen acts as an oxidizing agent~~ In my opinion, it is appropriate to classify it as Category B~~
It has to be done; even for inert gases, a gas-tightness test is necessary
1. Category B. 2. It’s not necessary to do it; if what you’re working on involves oxygen stations or something similar related to air separation, then it’s necessary to do it. I guess since you asked, it’s probably not the case.
I don’t know whether this is grade A or grade B. . . However, for oxygen pipelines, a leak test must be conducted. . . It mainly refers to the airtightness test in the leakage tests, that is, inflation and soap water testing: lol