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Re: Controlling Water Hammer

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Posted by Rick on June 22, 2007 at 18:22:03:

In Reply to: Controlling Water Hammer posted by Paul on June 22, 2007 at 06:42:43:

: I have three boilers, all fed with their own feedwater pump, but fed through the same line. Each boiler has it's own automatically controlled feed valve.

: We have a massive water hammer effect when the pumps cycle. It's been like this since I started here (3 years) and no one tries to correct it. Now I'm trying.

: From my studies, there seem to be 2 ways to control this. One is controlling the ramp up and ramp down of the feedwater pumps with a motor controller.

: The other is by installing a dampener.

: I'm wondering what do most of you suggest. If I go with controllers I know I need one per pump. If I go with a dampener though do I need one per pump, or would one suffice for all three?

You must have an on/off system. I suggest keeping the boiler feedwater pump running constantly and possibly on a variable frequency drive and use modulating level control valves on the boilers.

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