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  1. neilsk

    Pump Designing

    Hi All, I am going to replace an old constant speed pump with a bigger capacity VFD driven pump. This is a result of an increasing demand of potable water in the locality. old pump has these numbers: Size 10 x 12 x 13.34" Motor HP 250 Capacity 4,150...
  2. neilsk

    Pump Bearing - Drive End

    All, Thanks everyone who had shared their expertise, this is a good place of continuous learning! We already had replaced the bearing including the NDE. Now, some expert said recheck the pump-motor alignment after it has run for a couple of hours or in hot condition, while others said if there...
  3. neilsk

    Pump Bearing - Drive End

    LittleInch, The pump and motor with VFD were in late 1990's. We replaced the VFD with a brand new one of the same rating.The coupling was not changed but there was alignment check as part of routine maintenance prior to the test and commissioning. thanks..
  4. neilsk

    Pump Bearing - Drive End

    EnergyMix, thanks for the comments and this is the link that partially covered your 1st and 2nd paragraphs. <a href="http://www.eng-tips.com/threadminder.cfm?pid=407">Pump engineering Forum at Eng-Tips</a> The pump was not taken out. A new VFD drive was installed for the motor but before the...
  5. neilsk

    Pump Bearing - Drive End

    The reply is partially convered on the left with link. How can i removed this so i can read the whole sentences?
  6. neilsk

    Pump Bearing - Drive End

    Pump drive end bearing showed momentary vibration increasing abnormal sound after completion of test and commissioning of the new VFD for the 1000 Hp motor driving this 13,900 iGPM pump. I'm new to this group, your opinions would help me a lot. My question is : Do frequent starts and stops...

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