Blowdown should be done with the boiler under a light load. Open the
blowdown valve nearest the boiler first. This should be a quick opening
valve. Crack open the downstream valve until the line is warm. Then
open the valve at a steady rate to drop the water level in the sight
glass ½ inch. Then close it quickly being sure that the hand wheel is
backed off slightly from full close to relieve strain on the valve
packing. Close the valve nearest the boiler.
Repeat the
above steps if the boiler has a second blowdown tapping. Water columns
should be blown down at least once a shift to keep the bowls clean.
Care should be taken to prevent low water shutdown if this will affect
process load.
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Last Updated ( Thursday, 13 October 2005 )
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