Jungpao
Mechanical
- Sep 21, 2022
- 6
Hi Folks,
I am experiencing leak on the atmospheric side of mechanical seal on some pumps more specifically on cold service pump. We are using double pressurized mechanical seal for all the pump mentioned. The pump and seal operating condition as below :
1. Pump A1/B1
Pump type : OH2 Centrifugal Horizontal Pump
Liquid : Hydrocarbon
Temperature : -30 deg F (can reach -50 deg F)
Flow : 80 usgpm
Discharge Press : 440 psig
SG : 0.49
Vapor Pressure :360 psig
Seal Configuration :3CW-FF
Seal Face : Carbon / Sil-car (both product and atmospheric side)
Seal Ring : PTFE + Alloy
Seal Flushing : Plan 53B
Barrier fluid : 2-Propanol
2. Pump A2/B2
Pump type : OH2 Centrifugal Horizontal Pump
Liquid : Hydrocarbon
Temperature :-69 deg F (can reach -78 deg F)
Flow : 120 usgpm
Discharge Press : 450 psig
SG : 0.53
Vapor Pressure : 385 psig
Seal Configuration : 3CW-FF
Seal Face : Carbon / Sil-car (both product and atmospheric side)
Seal Ring : PTFE + Alloy
Seal Flushing : Plan 53B
Barrier fluid : 2-Propanol
The leak is visible only when pump standby and icing is defrosted (icing reach mechanical seal during standby).
Has anyone experience something like this? Also, is there any chance that the barrier liquid might need to be changed to other liquid (ethanol, propylene glycol, etc.)
Any suggestions or opinion would be very helpful. Thank you for your help!
Best Regards,
Jungpao
I am experiencing leak on the atmospheric side of mechanical seal on some pumps more specifically on cold service pump. We are using double pressurized mechanical seal for all the pump mentioned. The pump and seal operating condition as below :
1. Pump A1/B1
Pump type : OH2 Centrifugal Horizontal Pump
Liquid : Hydrocarbon
Temperature : -30 deg F (can reach -50 deg F)
Flow : 80 usgpm
Discharge Press : 440 psig
SG : 0.49
Vapor Pressure :360 psig
Seal Configuration :3CW-FF
Seal Face : Carbon / Sil-car (both product and atmospheric side)
Seal Ring : PTFE + Alloy
Seal Flushing : Plan 53B
Barrier fluid : 2-Propanol
2. Pump A2/B2
Pump type : OH2 Centrifugal Horizontal Pump
Liquid : Hydrocarbon
Temperature :-69 deg F (can reach -78 deg F)
Flow : 120 usgpm
Discharge Press : 450 psig
SG : 0.53
Vapor Pressure : 385 psig
Seal Configuration : 3CW-FF
Seal Face : Carbon / Sil-car (both product and atmospheric side)
Seal Ring : PTFE + Alloy
Seal Flushing : Plan 53B
Barrier fluid : 2-Propanol
The leak is visible only when pump standby and icing is defrosted (icing reach mechanical seal during standby).
Has anyone experience something like this? Also, is there any chance that the barrier liquid might need to be changed to other liquid (ethanol, propylene glycol, etc.)
Any suggestions or opinion would be very helpful. Thank you for your help!
Best Regards,
Jungpao