Regarding pump selection for benzene medium

Benzene is a flammable, explosive and toxic chemical raw material. Its steam can form an explosive mixture when mixed with air. Therefore, when selecting a pump to transport benzene, a leak-free pump must be used. At the same time, the requirements for fire protection and explosion protection should be met, and a motor with explosion-proof performance should be selected when necessary. In addition, due to the corrosive nature of benzene, there are certain requirements for the material of the pump. Usually we will choose 316 stainless steel or other corrosion-resistant materials. China's GB/T 5656-2006 "Centrifugal Pump Classification and Terminology" and other relevant regulations also provide specifications for chemical pumps. Regarding selection, factors such as medium properties, conveying flow rate, head, working pressure, temperature, density, etc. are mainly considered. If conditions permit, it is recommended to ask professionals to select the pump. .

High-risk pump configuration and operation management: https://bbs.hcbbs.com/thread-3196083-1-1.html

After checking the relevant specifications, a leak-free pump must be used. There is no basis for this. Why is it not a pressure double-seal centrifugal pump? This also prevents media leakage.

No, you can use a centrifugal pump, but it must be paired with the 53B external flushing solution

Thanks for the discussion. I want to see the relevant specifications and requirements. I searched the emergency department's order and found that there are requirements for styrene media but no requirements for benzene.

This post was last edited by Peking.CHEN on 2023-8-28 15:46 It is best to use a magnetic pump. Canned pumps are more expensive and centrifugal pumps are less safe. Petroleum depot design specifications (GB50074-2014) 7.0.6 Clause Ⅰ and Ⅱ toxic liquid transfer pumps should use canned pumps or magnetic pumps. According to the regulations at that time in GB5044-85 Hazard Classification of Occupational Exposure to Toxins (abolished in 2017), Schedule 2 clearly states that “benzene” belongs to Level I toxicity. With reference to these regulations, and based on the principle of intrinsic safety, magnetic pumps should be preferred.

Now that I have gained knowledge, there are requirements for the applicability of new construction, reconstruction, and expansion of oil depots. After consulting the design institute, this is the case. When weighing production and safety, there are still many things to consider.

"Design Specifications for Pump Areas in Petrochemical Storage and Transportation Systems" (SH/T 3014-2012) 5.1.3 When transporting occupational exposure poisons (levels I and II), canned pumps or magnetic pumps should be used.