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Posted by John on February 11, 2002 at 18:34:34:
In Reply to: Boiler Blowdown posted by JimC on December 25, 2001 at 17:54:40:
You are correct.
The ball valve is closest to the boiler and is the stop valve. The slow opening valve has got to be a metering valve. It makes sense that you open the ball valve first, warm up the line with the slow valve, then open it all the way when the lines are warm and you know you have unrestricted flow to the blow tank. Then, you may "bump" the drum by opening and closing the ball valve, but good practice is to do this sparingly.
After the blow, close the ball valve, then close the slow opening valve to reduce seat wear.