Pumping control system - Auto start - Discharge pressure Trip
Pumping control system - Auto start - Discharge pressure Trip
(OP)
Hi,
As part of the auto-start system for two identical pumps, We would like to implement a timer to trip both pumps if pressure in the discharge line is not restored when it expires.
What would be an appropriate length to set this timer?
Pump general details:
- Centrifugal pump
- Between Bearings design
- 2 stages
- Suction presure: 20 psig
- Discharge(normal): 450 pgig
- Flow (normal): 470 gpm
- Process temp: 450F
Thanks in advance,
As part of the auto-start system for two identical pumps, We would like to implement a timer to trip both pumps if pressure in the discharge line is not restored when it expires.
What would be an appropriate length to set this timer?
Pump general details:
- Centrifugal pump
- Between Bearings design
- 2 stages
- Suction presure: 20 psig
- Discharge(normal): 450 pgig
- Flow (normal): 470 gpm
- Process temp: 450F
Thanks in advance,





RE: Pumping control system - Auto start - Discharge pressure Trip
Preventing damage to a shaft seal on the pump if run dry? (can be slow e.g. gland seal with seal water turned on- minutes is fine) to fast (mechanical seal, no seal water applied -too late it's broken).
Preventing damage/failure due to extended operation of the pump under dead head conditions (erosion- days)
Preventing catastrophic failure of the pump casing due to operation of the pump (with fluid) and closed suction/discharge valves - can calculate based on pump power input, heat capacity and volume of pump.
Something else?
As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"
RE: Pumping control system - Auto start - Discharge pressure Trip
As IT says, depends on what the consequences of low pressure are which determine your timer requirements. My guess is anywhere from 15 seconds to 5 minutes
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pumping control system - Auto start - Discharge pressure Trip
If this is difficult to estimate, a coarse resolution dynamic simulation will help.
RE: Pumping control system - Auto start - Discharge pressure Trip
RE: Pumping control system - Auto start - Discharge pressure Trip
RE: Pumping control system - Auto start - Discharge pressure Trip
RE: Pumping control system - Auto start - Discharge pressure Trip
So MABM - what time did you chooses and why. Time for a bit more feedback.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.