At what oxygen level is it not allowed to perform welding?
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In air separation units, work cannot be carried out when the oxygen level is above a certain threshold. The issue regarding safety inspections at present is unclear; I would appreciate some guidance from those with more experience
19.5%-22.5%: Welding allowed
When performing welding or other fire-related operations inside equipment, it is also necessary to analyze and measure the levels of toxic and harmful gases as well as the oxygen content in the air. The concentration of toxic and harmful gases must not exceed the maximum allowable levels specified in the \"Health Standards for Industrial Enterprise Design\" (GBZ 1—2002), while the oxygen content should be between 18% and 22%.
The poster can refer to the oxygen safety operating procedures
When using fire inside equipment, containers, or sewers that contain toxic and harmful substances, the oxygen level in the working environment must be between 19.5% and 23.5%, and the concentration of such toxic and harmful substances must be below the maximum allowable concentration of harmful substances in the workshop air； If exceeded, corresponding measures must be taken, and this should be indicated on the fire work permit.
Work cannot be carried out in an oxygen-enriched system with a concentration of over 22%. This post was last edited by ldh525386 on 2009-2-26 13:59.]
According to the now-repealed \"Safety Regulations for Hot Work in Industrial Areas (HG 23011 - 1999)\\", the following provisions apply: 5.1.3 All production and storage devices such as containers, equipment, and pipelines that contain or have contained chemical hazardous materials must be cleaned and purged prior to carrying out hot work; hot work may only be undertaken after analysis confirms that they are clean enough. 5.1.4 Whenever hot work is to be carried out on pipelines, containers, towers, and other production facilities located in Class A or Class B areas as specified in GBJ 16 - 87, it is necessary to completely isolate these facilities from the production system, clean and purge them, and ensure that sample analyses show satisfactory results. 5.1.7 When hot work is performed on equipment used for the production, use, or storage of oxygen, the oxygen content there must not exceed 20%.
According to the \"Safety Regulations for Hot Work in Industrial Areas (HG 23011 - 1999)\), the oxygen content should be between 18% and 22%.
Whenever equipment, containers, pipes, etc. that come into contact with oxygen need to be repaired by welding, they must first be purged and replaced; only after testing shows that the oxygen content in the air is below 22% and the relevant department has been informed can the work proceed. Someone should be present to supervise when working with fire.
Looking forward to the new hot work regulations AQ – the new standard!
Work involving open flames is not permitted if the level is below 18%, or above 22%. If it is below 18%, people may experience oxygen deficiency symptoms
When performing hot work on equipment used for the production, use, or storage of oxygen, the oxygen concentration must not exceed 20%.
Thank you. By environmental oxygen content, we started the operation at 30%, and there was no significant change in the welding and cutting flames
Can the environmental oxygen content reach 30%? Please give me some advice!
Personally, I think there is a problem with the topic raised by the original poster, as flame work usually involves testing the concentration of flammable gases. Of course, an excessive oxygen level can lead to anaerobic conditions, while too low an oxygen level can cause suffocation. But I believe these are two different concepts; under normal circumstances, there should be no issue with excessive oxygen levels or oxygen deficiency, unless work is being carried out in a confined space. There are specific regulations for working in confined spaces, and it’s not the same as carrying out welding operations.
Personally, I believe oxygen content has nothing to do with hot work, unless combustible gases are involved; in that case, it is the concentration of those gases that is measured. Oxygen content is only checked when entering confined spaces. Last edited by lyhh9024 on 2009-3-1 13:01]
When performing hot work on equipment used for the production, use, or storage of oxygen, the oxygen concentration must not exceed 20%.
The air separation plant manufacturer will provide you with this ignition permit; ask the air separation plant about it
Standard for the Oxygen Industry of the Chinese People’s Republic (HG 23011 - 1999) 5.1.7 stipulates that when performing hot work on equipment used for the production, use, or storage of oxygen, the oxygen concentration must not exceed 20%.
The HG 23011-1999 safety regulations for hot work in industrial areas mentioned by the poster have been repealed; the new standards came into effect on January 1, 2009.