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Posted by bobby7388 on October 21, 2004 at 18:04:09:
In Reply to: water column and water level controller posted by MDysert on October 17, 2004 at 07:31:10:
: Recently replaced controller (McDonnell-Miller
: 150s) and seems to be extremely sensitive
: to water oscillation when feed water pump
: comes on causing numerous low water
: shutdowns. Have increased blowdown in that
: suspected TDS problems but indications are
: that has not significantly increased. Should
: I suspect my water column equalization lines?
: Any other obvious things I am overlooking?
Something else to look at.
Are you sure your feedwater temp is satisfactory? to cool of a temp can cause steam collapse during feeding.
Also, do you have too high a pressure drop in feed line as soon as pump activates causing the boiler level to drop quickly? This could be due to piping issues or back checking issues