as knowing when to dispose of a valve
as knowing when to dispose of a valve
(OP)
Greetings .-
I am researching valves used in natural gas distribution networks and would like to know what are the criteria for a valve is discarded and no longer be repaired, there is some Standard or document about it.
Thank you
I am researching valves used in natural gas distribution networks and would like to know what are the criteria for a valve is discarded and no longer be repaired, there is some Standard or document about it.
Thank you





RE: as knowing when to dispose of a valve
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist
RE: as knowing when to dispose of a valve
Another factor is risk and consequences if anything goes wrong with a valve, and cost of tests for the net and single valves.
Eg.: No easy way out, no general formula, but lots of gathered experience in each single valve branch. (And I also have none for gas distribution
RE: as knowing when to dispose of a valve
Do you mean steel or plastic valves, ball valves, gate valves, plug valves, butterfly valves what sort of pressure range (could be <1 bar to >70 bar) and size (<1" to > 36")...?
The cost and availability of repair places varies just as widely therefore one company could have a policy of replacement and discard / scrap and another that they repair and replace. the same type size and rating of valve.
Most distribution system valves tend to be always open or always closed so valve repair tends to be limited, thought you may have other experience.
Why are you researching this and for whom?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: as knowing when to dispose of a valve
Of course the desicion repair / discard the valve was taken considering the economic, logistical and engineering factor.
We are talking about ball valves, from 2 "to 8" in steel, with a pressure up to 35bar online.
Thank you.
RE: as knowing when to dispose of a valve
For gas distribution it should only really be the seats which wear out or need replacing but as repair costs have risen much faster than the cost of the original new item, the margin where you replace rather than repair gets smaller and smaller every year and hence the economic number of things which can be replaced goes down.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way