Pumps in Benzene Servive
Pumps in Benzene Servive
(OP)
Friends,
We have quite a few pumps in toxic service containing benzene from 1-10% in the fluid. Though we have no special requirements except limiting VOC emissions, Supllier is expressing concerns with their seals design with this service. Pls advise as to what should be the seal designs for these pumps in benzene handling.
Tech
We have quite a few pumps in toxic service containing benzene from 1-10% in the fluid. Though we have no special requirements except limiting VOC emissions, Supllier is expressing concerns with their seals design with this service. Pls advise as to what should be the seal designs for these pumps in benzene handling.
Tech





RE: Pumps in Benzene Servive
RE: Pumps in Benzene Servive
2) What material are the seals you're using now comprised of? We're talking an elastomer, right?
According to the information I have on pure benzene, Buna-N is classed as "conditionally resistant" and Viton as "resistant." EPDM, EPT, and neoprene are "not recommended."
Dave Wichern
http://www.dedalusenviro.com
Science is a business of empiricism.
RE: Pumps in Benzene Servive
RE: Pumps in Benzene Servive
Usually on Benzene duties a dual pressurised seal is recommended if a mechanical seal is required. If elastomeric (rubber) O-ring materials are needed, then Fluorocarbon (Viton) is limited to relatively low temperatures (I wouldn't consider Buna-N). The only other rubber material with sufficient resistance is perfluoroelastomer which would go to higher temperatures.
RE: Pumps in Benzene Servive
Our company had a chemical client that required new 100% benzene pumps. They required Crane canned pumps with pump flow monitors.
Many of our clients do not like the double mechanical seals and, instead prefer to used canned pumps. Canned pumps, of course, have thier own start-up shut-down issues.....
Epoisses, specifically, what problems have you had with the mag-drives ? Who made these pumps and what service were they in ?
Regards
_mjc