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Posted by Bob D. on January 13, 2010 at 10:45:52:
In Reply to: Water surging in sightglass hitting low water cutoffs. posted by Steve Hill on January 12, 2010 at 09:27:59:
Hi Steve - No real simple, straightforward, "default", suggestions. Are these brand new installs, or did they replace something else? If replacement, did the installer match waterlines, condensate and make-up requirments, (is there any condensate return, or does the process use it all) etc? Was there a big change in water volume between old and new? Did anything change in the feedwater system (valve Cv, differential pressure, pump capacity, etc.) Are the steam headers (take-offs) properly sized (low velocity), at the correct height, and with a proper Hartford loop or equalizer (if required)? Does your process require such rapid steam response, and can the controls be adjusted to ramp/step up more gradually? Once they trip on LWCO, does the condensate receiver (if there is one) then overflow once condensate begins to return? Is the indicated water level actually "surging", or is it simply steaming down? If "bouncing", think about trying a surge column in parallel with the LWCO.