Feed water valve from de-aerator tank
Feed water valve from de-aerator tank
(OP)
Hi all.
I would like to ask you, is there any standard requirements for installing main valve on feed water line? On existing line, there are two valves on the branches leading to boiler feed pumps, but no valve on the main line. In case of changing/maintaning of any valve, feed water tank will drain.
Is there any common practice, or standard requirement where I can look for it?
I would like to ask you, is there any standard requirements for installing main valve on feed water line? On existing line, there are two valves on the branches leading to boiler feed pumps, but no valve on the main line. In case of changing/maintaning of any valve, feed water tank will drain.
Is there any common practice, or standard requirement where I can look for it?





RE: Feed water valve from de-aerator tank
RE: Feed water valve from de-aerator tank
RE: Feed water valve from de-aerator tank
Secondly, having lots of valves, fittings, bends, turns, etc. in suction piping to BFP's is not good practice. Best practice is to minimize head loss and that includes losses from piping and piping components in pump suction piping.
Do you have a history of having failures of these valves? Valves of this nature are usually serviced during plant shutdowns when you should be draining the deaerator tank anyway to inspect it anyway.
You are draining nad inspecting your DA tank, aren't you? I would be concerned about that, now.
rmw
RE: Feed water valve from de-aerator tank
Given the function of the deaerator tank is to promote the dissolution of gases, I would be concerned more with avoiding pump cavitation than maintaining the valves. My comment on such a design would be to ask if the pumps can be located closer to the DA.
RE: Feed water valve from de-aerator tank
RE: Feed water valve from de-aerator tank
But, I'll install the block valve, just in case. All of them will be normaly open, so problem expectancy should be minimum.
RE: Feed water valve from de-aerator tank
Personally, I prefer to have a rebuilt valve instead of a new one. Who knows what grade of person built a new valve? Whereas a rebuilt one was done by a valve specialist.