For extremely and highly hazardous media, which type of centrifugal pump should be chosen?

For extremely hazardous media, corrosion-resistant centrifugal pumps with low leakage rates should be selected, such as magnetic drive pumps or leak-free pumps. There are corresponding standard specifications to follow, such as ISO and API standards. Centrifugal pumps with conventional mechanical seals may not be suitable; it is necessary to choose an appropriate type of seal based on the specific medium and application conditions. .

Could you list the specific reasons in more detail? Thank you!

A selection can be made based on the API 685 standard, which specifies the requirements for leak-free pumps (magnetic drive pumps). In addition, for special media, it is also necessary to refer to the requirements for centrifugal pumps in API 610 standard. Centrifugal pumps equipped with standard mechanical seals are generally not recommended for use with extremely hazardous media, as their leakage risk is relatively high. If necessary, centrifugal pumps with dual or high-pressure resistant seals can be selected, along with an appropriate leakage detection system. .

This post was last edited by Li Lili Xutao on 2024-5-30 at 11:48. The Office of the Emergency Management Department issued a notice regarding the publication of the \"Catalogue of Obsolete Safety Production Processes, Technologies, and Equipment for Hazardous Chemicals (Second Batch)\" [Emergency Department [2024] No. 86]. According to this notice, single-face mechanical seal centrifugal pumps and packed seal centrifugal pumps (excluding submersible pumps) are prohibited from being used for transporting hazardous chemicals classified as Category A, those that are extremely hazardous or highly hazardous, as well as those whose operating temperature exceeds their auto-ignition point. It is required that such existing equipment be replaced within three years. Alternatives: double-end mechanical seal centrifugal pumps, centrifugal pumps equipped with series mechanical seals or dry gas seals, or leak-free pumps such as shielded pumps, magnetic drive pumps, and diaphragm pumps. PS: To determine whether it is a Class A medium, refer to the \"Code for Fire Protection Design of Petrochemical Enterprises\" GB 50160-2008 (2018 edition) ； To determine whether it poses an extreme or high level of hazard, refer to the \"Classification Standards for Toxicity and Explosive Hazard Levels of Chemical Media in Pressure Vessels\" HGT 20660-2017.

Correct. The poster’s question seems to have also been posed under the requirement of releasing the elimination list as quickly as possible.