3 replies to this topic

[jmp121104]

Experience: 7.5 years polyester staple fiber production, 7.5 years biotech recovery, 1.3 years specialty chemicals; centrifugal pump experience is limited.

Situation: centrifugal pump recirculates process oil continuously from / to tank. When tank must be emptied, a low pressure switch shuts the pump off when tank empties; one such switch continuously malfunctions, need other option to protect pump.

Question: what resources can you direct me to regarding other options, e.g., low amp drawn when pump runs dry...?

John

[pavanayi]

John,

Could you post a schematic PFD of the system that you are mentioning showing the location of the above mentioned pressure switch?

Have you thought about a level switch? For more reliability, you might want a 1 out of 2 (1oo2) configuration with the switches?

Edited by pavanayi, 22 February 2012 - 03:35 AM.

[breizh]

You may think flow switch or vibrating forks .
Hope this helps
Breizh

[Bharathiraja]

You may consider the following to trip the pump
1. Low Low Level switch in the tanks
2. Low Low Flow switch at the pump discharge line.