Posted by Mike Pugh on December 27, 2001 at 12:47:01:
In Reply to: Re: Boiler Blowdown posted by Mike Pugh on December 27, 2001 at 12:40:55:
You are correct to be concerned with water hammer on your pipeing system. So the way you are operating will warm up the pipes, but after warming the pipes , I would close the ball valve , and open the globe valve in full , and then quickly open the ball valve. If you do not create turbulance inside the boiler you won't blow out the junk.
: : Can some one help me?
: : I seem to be getting conflicting information about the proper location and types of bottom blowdown valves and procedure for operating them.
: : We have a 100 HP, three-pass, fire tube, boiler burning natural gas. Producing 100psi steam. presently there is a ball valve next to the bottom of the boiler and directly below that, there is a slow opening globe valve.
: : For years we have conducted our daily bottom blowdowns by opening the fast opening ballvalve first, then the slow opening globe valve second. Then closing in the reverse order.
: : Now, there is a chemical rep. who says that we are wrong. What is the correct valve arrangement for this boiler and what is the correct procedure for blowdown? Please explain the rationale for your answer. Many thanks in advance!