10. GRUNDFOS TRANSFER PUMP DESCALING

10. GRUNDFOS TRANSFER PUMP DESCALING

The transfer pump P-210 will have scale deposits build up on the impellors and bearings in the pump. This will lead to reduced pumping performance and eventually to the pump stalling.  The scale is comprised of a mineral and iron scale.  This scale is easily removed by soaking the components in a mild acid solution until the scale is dissolved.

 


PUMP DESCALING PROCEDURE

  1. Place the pumps Hand-Off-Auto switch to Off, and turn off the pump breaker.
  2. Remove the coupling guards from the pump base.
  3. Remove the pump/motor coupling.
  4. Unbolt the motor from the pump stand and remove the motor.
  5. Remove the pump from service by disconnecting the inlet and discharge piping.
  6. Install back up replacement pump and complete steps 1 – 4 in reverse and restart system (Optional – provided spare pump has been purchased).
  7. Following Manufacturer’s instructions disassemble pump.
  8. Make down a mild HCl (5:1) or Citric Acid (2:1) solution.
  9. Place pump impellers, bearings, pump bowls, and pump shaft into acid solution.
  10. Remove components as soon as scale is removed.  HCl will begin to pit the stainless steel if left in the solution for long periods of time.
  11. Reassemble pump as per manufacturer’s instructions.
  12. Place pump back into service or self as spare pump.

Info
Note:  Scale removal from items, such as the bearings, could take upwards of an hour for the acid to penetrate and dissolve the scale.



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