Comments for Water Hammer (Part Two): Causes and Variables at http://www.pump-zone.com , comment 1 to 4 out of 4 comments http://www.pump-zone.com Tue, 06 Jan 2009 06:20:57 +0100 FeedCreator 1.7.2 http://www.pump-zone.com/valves/valves/water-hammer-part-two-causes-and-variables.html#comment-14 Calvin, the 0.07 constant is found throughout the literature. The first two equations you reference are approximations and probably cannot be used to derive the latter one. Best regards, Joe - Joe Evans Wed, 08 Oct 2008 17:16:59 +0100 http://www.pump-zone.com/valves/valves/water-hammer-part-two-causes-and-variables.html#comment-13 Hello Dr J Evans, Based on the equations in your Water Hammer (Part One) article, (1) P=aV/2.31g & (2) Tc=2L/a, I come with P=0.027(VL/Tc), not P=0.07(VL/T)in Part Two article. Kindly please advise how to get P=0.07(LV/T). Please reply at your earliest convenience. Thank you very much for your help. Best regards, calvin - Calvin Chew Mon, 06 Oct 2008 19:00:00 +0100 http://www.pump-zone.com/valves/valves/water-hammer-part-two-causes-and-variables.html#comment-7 Enjoyed your article - Excellent! You mention VFD soft starting and stopping to eliminate water hammers; ABB has a feature in out PST line of SoftStarters called Torque Control which was specifically designed to eliminate water hammers :) - Lorenzo Di Maso Wed, 17 Sep 2008 14:03:44 +0100 http://www.pump-zone.com/valves/valves/water-hammer-part-two-causes-and-variables.html#comment-4 I have been following this. I work in power generation so I deal with this on the steam side as well, and while the issue is the same with steam, it's causes can be some what more difficult to diagnose. In apropriate pressure losses, tempurature conversions and such. I am looking forward to the next segment. - Richard Nielsen Wed, 10 Sep 2008 17:17:42 +0100