A: Sewage drainage trench is set in the unit area outside the workshop, which is beneficial to the collection of primary rainwater. Trenches should not be set in the workshop. Q: Petrochemical Regulation 7.2.15: The pipeline from liquefied hydrocarbon and combustible liquid equipment with operating temperature equal to or higher than the natural point to the pump inlet shall be provided with a shut-off valve. Is this valve a general valve or an emergency cut-off valve? A: Not necessarily the slam-shut valve. If the distance between the valve and the pump is less than 15 m, the valve shall be remote controlled with manual function. Q: Petrochemical Regulation 7.2.18: Pipes for liquefied hydrocarbon, liquid chlorine and liquid ammonia shall not be connected by hoses. I would like to ask whether it is contradictory to use metal hoses when unloading. Many enterprises use liquid chlorine cylinders and use hoses when gasifying. It is not feasible according to the specifications. Is there any other feasible way? A: The connection between the tank car and the pump can be a metal hose. Hoses shall not be used to connect the tank to the pump. Q: The whole plant area uses petrochemical specifications, but there are only Class C workshops and Class B outdoor rectification devices in the whole plant area. Is it necessary to set up explosion-proof control rooms? Can it be set up in the workshop? A: Need. The petrochemical regulation stipulates that an explosion-proof control room should be set up. Q: Petrochemical Regulation 7.2.9: As for the issue that the equipment and pipelines shall be replaced with inert gas in the Petrochemical Regulation, only Class A and Class B media are required. Other toxic and harmful media are not mentioned. Can it be understood that replacement is not required? A: Class A and Class B media shall be replaced with inert gas to prevent explosion during hot work for maintenance. The toxic medium may also be displaced in other ways. Q: Class C and B liquids with a storage temperature higher than 100 shall be provided with a special purging tank. How to set the purging tank? Where is the purging tank? Can it be set in the same tank group? A: Scavenging tank is set underground (buried). Scavenging is generally laid underground. For cold areas, it can be laid on the pipe gallery (to prevent pipeline blockage). Q: Is the outdoor equipment area of the fine chemical project regarded as the unit area, and is the layout in accordance with the relevant requirements of Table 5.2.1? If the outdoor equipment area is regarded as the unit area, is the safety distance from the workshop considered? A: The outdoor equipment area can be regarded as the plant area and shall comply with the relevant requirements of Table 5.2.1. If there is a compressor in the workshop, there is a spacing requirement, and there is no other spacing requirement. Q: According to Article 21 of Appendix B of Code for Design of Electrical Installations in Explosive Atmospheres, for production devices with process equipment volume not greater than 95m ³, pressure not greater than 3.5MPa and flow not greater than 38L/s, which are the secondary release sources, according to the practical experience of production, the scope of explosion hazard areas is divided with the release source as the center. The area within a radius of 4.5m can be classified as Zone 2. How to judge the division of explosion hazard area for the heat transfer oil boiler and the heat transfer oil storage tank arranged in the workshop? A: The range of 4.5m around the equipment is divided into 2 zones. Q: Bursting disc shall be set in front of the safety valve of the equipment with higher concentration of ethylene oxide. The inlet pipe of bursting disc shall be provided with nitrogen seal, and the outlet pipe of safety valve shall be filled with nitrogen. How should the nitrogen seal and nitrogen filling be set here? Is the nitrogen always on or does it require a pressure interlock? A: The nitrogen is always in the normally open state, and the pipeline is provided with a flowmeter. Q: For the storage tanks of Class A, B and B liquids sealed with nitrogen or other gases, in addition to the emergency pressure relief equipment, must the outlet of the breather valve set above be connected to the main pipe of tail gas treatment (except for Class I and II toxic media that cannot be discharged into the air)? A: Breathing valves of Class A, B and B liquid storage tanks do not need to be connected to the main pipe of tail gas treatment. Q: For the storage tank of flammable liquid, it is required to set an automatic dehydrator. How to set the automatic dehydrator here? A: Refer to the following figure: Professional problems of water supply and drainage Q: How to distinguish between large, medium and small petrochemical enterprises? According to the provisions of No.76 of Safety Supervision, there are two key and one major enterprises to follow the petrochemical regulations, so when the petrochemical regulations are applied to fine chemical enterprises, how to distinguish between large, medium and small petrochemical enterprises? A: For the classification standard of petrochemical regulation, see the article description: large enterprises with crude oil processing capacity greater than 10,000kt/a, and medium enterprises with crude oil processing capacity greater than or equal to 5,000kt/a and less than 10,000kt/a. Q: How to calculate the fire water quantity in the unit area? Especially for some small devices, how to define the amount of fire water? A: The fire fighting water volume in the unit area of petrochemical enterprises shall be subject to Section 8.4 of the Petrochemical Standard, and the fire fighting water volume of small units can be determined by referring to the provisions in Section 8.4.3. Q: How to understand Article 8.4.8 of the Petrochemical Regulation? If remote large and medium-sized petrochemical enterprises (without natural water sources around) need to add 10000 cubic meters of fire pool? A: Article 8.4.8 stipulates that "when adjacent enterprises have interconnected fire pipe network, the corresponding effective water volume can be deducted". That is to say, if the enterprise is located in or around the chemical industry park with adjacent enterprises to rely on, the corresponding amount of water can be subtracted, not necessarily 10000 cubic meters of fire pool. Q: The process unit area and tank farm of large petrochemical enterprises shall be provided with independent stable high-pressure fire water supply system. Which specification shall be followed for the stable high-pressure fire water supply system? There is no design requirement for the stable high-pressure system in the fire regulation. Is the stable high-pressure system designed with a high-level fire water tank? A: The stable high-pressure fire water supply system of large petrochemical enterprises shall comply with the requirements of the Petrochemical Standard. Article 8.11.4 States that "the following single-storey warehouses shall be supplied by the stable high-pressure fire water supply system". This article explains that the stable high-pressure fire water supply system installed in petrochemical enterprises has reliable water quantity and water pressure guarantee, and can be directly used in buildings without installing high-level water tanks. Q: How to understand 8.7.6 of the Petrochemical Code? The storage capacity of the foam concentrate required by the code should be calculated and determined, and should not be less than 100 cubic meters. How to store the 100 cubic meters of foam concentrate and what are the requirements for the storage settings? A: Article 8.7.6 stipulates that "when there are supporting conditions in the area, the sum of the amount of foam concentrate stored in the enterprise and the amount of foam concentrate that can be supported shall not be less than 100m3". This foam concentrate can be stored in a suitable place according to the specific conditions of the project, for example, it can be stored separately at the on-site foam station and the fire station. Article 8.2.3 stipulates that "the fire station should be equipped with facilities for rapid filling of foam concentrate to the fire truck." That is, not only the foam concentrate storage tank,free shipping disposable coverall, but also the foam concentrate delivery pump shall be provided. Q: The fire cooling of Class A B liquid pressure spherical tank with boiling point lower than 45 should be set according to the requirements of liquefied hydrocarbon full-pressure storage tank, so how to set the fire cooling of Class A B liquid pressure horizontal storage tank with boiling point lower than 45 ? A: This can be done in accordance with 8.10.12. Q: Class C and B liquids with a storage temperature higher than 100 shall be provided with a special purging tank. How to set the purging tank? Where is the purging tank? Can it be set in the same tank group? A: Scavenging tank is set underground (buried). Scavenging is generally laid underground. For cold areas, it can be laid on the pipe gallery (to prevent pipeline blockage). Q: Is a fixed or semi-fixed foam fire extinguishing system provided for the 2000 m3 low pressure storage tank? A: Tanks other than those in 8.7.2 and 8.7.3 may be semi-fixed in accordance with 8.7.4. 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