Boiler feed water pump Vibration
Boiler feed water pump Vibration
(OP)
Gents,
We have a problem in our steam turbine driven BFW pump. We always getting high 1X vibration reading from turbine outboard radial direction. It is monitoring by proximate probe.Single stage steam turbine, speed is 4732RPM. Forced lubrication type.we suspected, steam pipeline layout issue.. but i am not sure about it. readings we received 70 microns..Pk-Pk
based on your exeperience what are the other possible cause for this issue? Though we checked alignment and ruled out no-unbalance. and hot and cold alignment also within the OEM specs.
Thanks
We have a problem in our steam turbine driven BFW pump. We always getting high 1X vibration reading from turbine outboard radial direction. It is monitoring by proximate probe.Single stage steam turbine, speed is 4732RPM. Forced lubrication type.we suspected, steam pipeline layout issue.. but i am not sure about it. readings we received 70 microns..Pk-Pk
based on your exeperience what are the other possible cause for this issue? Though we checked alignment and ruled out no-unbalance. and hot and cold alignment also within the OEM specs.
Thanks





RE: Boiler feed water pump Vibration
Thanks Doug
RE: Boiler feed water pump Vibration
In same scenarion, this time we have BFW pump driven by motor and gearbox also there. We received high 1X vibration from pump inboard side, besides multiple orders but levels are so small.. compartively 1X is high..
we suspect : scratch in shaft or chrome plate thickness variation
Rubbing
very loose interanl component rattling such as impeller
RE: Boiler feed water pump Vibration
Johnny Pellin
RE: Boiler feed water pump Vibration
How long is always?
Do you have any vibration history?
Any repair history?
RE: Boiler feed water pump Vibration
We changed whole casing and rotor recently.. However we suspect that sensor and instrument having malfunction since long time. That was the only reason why we have unbelievable reading like 160 microns PK -PK. Though they fixed, still we are getting 65 microns. We still unaware that this is the real instrument problem or from machinery.:(
The same pump but driven by electric motor connected with gearbox. We have high 1X in pump inboard x direction. Almost 40-50 microns. But the level are fluctuating.. some times it went upto 50 micron another time 45 or 35 microns. My question is, can the mechanical issue fluctuating thier level as like process issue?
These are our possible causes, for high pump vibration ; scratch in shaft
Rubbing
very loose interanl component rattling such as impeller