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Topic: Why are we experiencing anti-rotating device failures at an alarming rate?

anonymous
We have three circulating water vertical pumps and we are experiencing anti-rotating device failures at an alarming rate. The discharge line is 72 inches. All the parameters have been checked and we are still clueless of the problem. Pump Detail Equipment description: Circulating Water Pump Equipment Tag No. : CW-PP-002 (A/B/C) Type: Vertical Flow Sump Pump Model: 1800HV Head: 17m Capacity: 17280 m3/h Shaft power: 971 kW Speed: 495 rpm Pump height:10m Weight (pump): 30 ton Weight (motor): 20 ton Manufacturer: Shenyang Pump Manufactory, China
  • Avatar Ross Mackay Forum Moderator 94 Posts

    Re: Why are we experiencing anti-rotating device failures at an alarming rate?

    When anti-rotation devices fail at an "alarming rate" it would indicate that the pumps are being forced to run backwards by the flow through the system. Without knowing operating details of the system I'm afraid I can't help. However, I would suggest you investigate the reasons and conditions under which the system would be reversing.
  • Avatar Charles Bensen Community Member 1 Post

    Re: Why are we experiencing anti-rotating device failures at an alarming rate?

    Last edited: 5 February 2013 at 2:32pm
    I am looking for feedback if a root cause was identified for the anti-rotation device failure posted in February 2012? We experienced a recent failure of a new device installed on a circ water pump without a check valve (no room for check). We installed the anti-rotation device because our 4 pumps are now connected to a common header and if a pump trips it takes 2 minutes for the discharge MOV to close. Pipe diameter is 9ft. We verified expect reverse torque and device design calculations are ok. Material composite analysis showed no anomalies. Currently we have the failed components at a lab for fracture analysis. Device is pin design. Any feedback would be helpful. Also, do you know of a vendor that offers retro-fit anti-rotation hardware?
  • Avatar Ross Mackay Forum Moderator 94 Posts

    Re: Why are we experiencing anti-rotating device failures at an alarming rate?

    Last edited: 5 February 2013 at 2:32pm

    Unfortunately, this is a situation that would require an in-depth study of the situation, which we obviously can't do in this forum.