its hard to say much of value with such limited info. By pressure barrier I
presume you mean hydraulic barrier which gives a local pressure drop across
the valve.
I dont see the significance of thermal barrier other than heat loss and
barrier creating yet another location for formation of condensate which as
slugs causes the hammer.
All of these "thermal" and "pressure contribute and aggravate the problem
and only a "Clean" system will be trouble free. This isnt realistic in
practice so you can only improve on what you have. Fix "dirty" traps,
eliminate unnnecessary interruptions etc.
are they inverted bucket, thermostatic or other traps?? these all should have built in check valves. hard to understand the setup from the description...
a starting pint would be to go through and check the sizing and load. usually this is what causes the trouble/problems.
http://www.armstrong.be/pdf/N_101.pdf
not sure where "ponnuc" is referring to for seasonal difference literature
.. perhaps he can repost.
as an aside has anybody heard of using these traps for non-steam ie petrochem condensate service. seems wacky but its out of the box thinking
-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com]
Sent: Friday, April 30, 2004 4:50 PM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Fw: [STM] Condensate Return
Any ideas from the water hammer specialists for this guy?
Paul
> Recently visited a plant to investigate water hammer in a closed
condensate
> return system.
> Three condensate return lines input to a receiver for a steam powered
pump
> return system. The condensate is then pumped to the boiler room DA.
>
> Some observed conditions at the receiver/pump system:
> The traps and pipe insulation on the three return lines are typical of
the
> limited maintenance in most plants.
> One of the return lines may have blow through steam.
> The float and valve system may need repair.
>
> While a proper analysis requires a complete check of the entire
system, the
> plant personnel feel that focus should be on the receiver area. The
claim is
> that the water hammer increases in the spring, and is only a slight
problem in
> the winter.
>
> My specific question for this inquiry regards the swing check valve
located
> in each of the three return lines. I am trying to understand the
purpose of
> these check valves, especially since I do not feel that either line
can cause
> overflow to another.
> I am wondering about the pressure barrier and the thermal barrier
created by
> the check valve.
>
> Do not feel that the pressure barrier is significant, but the thermal
barrier
> may have some significance.
>
> Jim C
> Portland Or
Yahoo! Groups Links Received on Sat May 01 14:10:00 2004
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