Using an accumulator for thermal relief.
Using an accumulator for thermal relief.
(OP)
We have liquid manifold systems that are periodically isolated. To protect from thermal expansion the systems are relieved thru a relief valve to a sump or across an isolating valve to downstream.
I am curious whether anyone has used a hydraulic accumulator for this purpose.
I am curious whether anyone has used a hydraulic accumulator for this purpose.





RE: Using an accumulator for thermal relief.
RE: Using an accumulator for thermal relief.
RE: Using an accumulator for thermal relief.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
RE: Using an accumulator for thermal relief.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
Look, no LDARS, no wasted materials, no VOC's, no mandated inspections every 6 months, no fuss no muss.
look at how cameron valves use this principle.
h
RE: Using an accumulator for thermal relief.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
Regards
RE: Using an accumulator for thermal relief.
And change that 27 Oct 07 4:37 post from, "can buy into it" into "can't buy into it". Reconsidering, IMO it defeats the intent of the codes. That is a relief valve in everything, but name.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
There would be no reason for the nitrogen to leak out. Depending on the working pressure, a diaphragm, bladder or piston accumulator could be used.
A bigger acc' would give bigger gaps between service intervals.
By law the accumulator has to be protected from over pressure situations, so if the precharge was lost and the acc' filled up, you would still see a similar level of protection as the relief valve took care of the extra pressure.
Cost is an issue though, as accumulator cost much more than isolation valves.
If cost was not a problem, I would go for the acc'.
Adrian
RE: Using an accumulator for thermal relief.
In purity benzene or butadiene service, PSV's are a no no, think about it.
RE: Using an accumulator for thermal relief.
Benzene is pretty much the same as gasoline, for which we run relief valves to a closed HC drain both in the surface and the underground facilities.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
On our pipelines, we don't have a closed drain system and at the delivery points the customers won't let us tie into their's. Now what. Can you buy into them now?
RE: Using an accumulator for thermal relief.
http://virtualpipeline.spaces.msn.com
RE: Using an accumulator for thermal relief.
What do you want to limit pressure to when isolated?
What is the typial and/or maximum volume from expansion?
How many positions need this protection?
What is min/max operating temperature of the atmosphere
the accumulator must operate in?
Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING