NDE Bearing Burn in Boiler Feed Pump
NDE Bearing Burn in Boiler Feed Pump
(OP)
Hi....
i have problem in boiler feed pump, the NDE bearing is over heat and burn only in seconds, we replace with new bearing, and the problem still same. 10 stages pump with balancing device and balancing pipe, gland packing. type of bearing tapper roller bearing, balancing drum is new, clearance balancing drum 0.3mm. please help me to find the problem.
thank you.
i have problem in boiler feed pump, the NDE bearing is over heat and burn only in seconds, we replace with new bearing, and the problem still same. 10 stages pump with balancing device and balancing pipe, gland packing. type of bearing tapper roller bearing, balancing drum is new, clearance balancing drum 0.3mm. please help me to find the problem.
thank you.





RE: NDE Bearing Burn in Boiler Feed Pump
Johnny Pellin
RE: NDE Bearing Burn in Boiler Feed Pump
What type of coupling? Could the driver be imparting a thrust into the shaft?
Are you starting the pump under load or isolated? Is the pump primed when starting.
Have any modifications been made to any of the pump stage impellers?
Is it a double flow first stage, or single flow?
Give with some more information so we can help you.
RE: NDE Bearing Burn in Boiler Feed Pump
The problem in most multi-stage pumps that are de-staged, is that when you change which stage is blanked (high pressure side or low pressure side) it changes the thrust balance. If you size that bushing wrong (too large, or too small) the thrust balance can lead to an overloaded or underloaded bearing.