Which standards specify the setup and safety requirements for designated areas where welding can be performed in chemical plants?

Designation of designated welding areas and no-welding areas: Chemical enterprises should designate designated welding areas and no-welding areas within their premises, based on the level of fire risk as well as the requirements of production and maintenance activities. Designate fixed hot work areas. A designated hot work area is an area where welding, cutting, and the use of blowtorches and furnaces are permitted. The establishment of a designated area for hot work must meet the following conditions: a. It should be at least 30 meters away from flammable and explosive buildings, equipment, pipelines, etc. b. Fixed indoor welding areas should be separated from sources of danger, doors and windows should open outward, and pathways must be clear. c. During normal production venting or in the event of an accident, combustible gases cannot spread into the designated hot work area ； Under any weather conditions, the combustible gas level within the designated hot work area must be below the allowable level. d. The designated area for hot work must be clearly marked; flammable materials are not allowed to be stored there, and appropriate fire extinguishing equipment in sufficient quantity must be available. e. The designation of fixed hot work areas shall be requested by the workshop (department), reviewed by the fire prevention and safety departments, and approved by the plant manager in charge or the chief engineer. No-fire zone. It is generally believed that areas where explosive mixtures can form under normal or abnormal conditions, as well as areas containing flammable and combustible chemicals, should be designated as no-fire zones. Generally speaking, except for the designated areas where welding is permitted, all other areas within the plant are fire-prohibited zones. When working with fire in a no-fire zone, it is necessary to apply for a “Fire Work Permit”. When performing welding or other hot work in a no-fire zone, it is necessary to classify the level of risk, and determine the appropriate person responsible for approving such work based on that risk level, in order to ensure proper handling of such activities. It seems there is no specific standard number; the regulations on safety management for hot work also do not mention anything related to this. Perhaps it’s because I lack knowledge – I hope experts can offer some guidance.

Where do these criteria set forth by the person upstairs come from?

Safety Management System for Chemical Enterprises of the former Ministry of Chemical Industry

I earnestly request the latest standards; my factory needs to establish them