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Relief valves and nearby powerlines/transformers

Relief valves and nearby powerlines/transformers

Relief valves and nearby powerlines/transformers

(OP)
Hello.

In all my years of gas engineering I have never had a relief valve in close proximity to powerlines. I am designing a new natural gas regulator station at the end of a new pipeline and the preferred location is adjacent to an industrial park road ROW with powerlines just inside the ROW. I want to be just outside the ROW with my station.

AGA XF0277 and API RP 500 only really talk about equipment requiring Class 1, Div 1/Div 2 within 15 or less feet. B31.8 and Part 192 are pretty useless for this. The relief valve API codes, 520 I think, didn't give me anything of use.

I've looked everywhere and cannot find any guidance. I recognize that each situation is different with this type of situation and that it will likely require real engineering, but wanted to check and make sure I don't reinvent the wheel.

Thoughts?

RE: Relief valves and nearby powerlines/transformers

What's your issue exactly?

Your station should not result in a hazardous atmosphere outside your fence line.

In theory,someone could be having a barbecue right on the fence line as you have no power to stop them so need to avoid anything you do creating a hazard. That's the issue here I feel.

Powerlines are not a direct hazard. You need to do something to create a spark.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Relief valves and nearby powerlines/transformers

Previous Eng Tips suggest it is not a great idea.
https://www.eng-tips.com/viewthread.cfm?qid=292075

INGAA
https://ingaa.org/wp-content/uploads/2015/10/24732...

Induced voltage considerations
https://pgjonline.com/magazine/2022/march-2022-vol...

https://www.sestech.com/pdf/User2000_I.pdf

Future work space
https://www.safeworkers.co.uk/equipment-environmen...

And
Electric companies also have their own general clearance standards.
https://electrical-engineering-portal.com/electric...

https://www.saskpower.com/safety/electrical-safety...

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

RE: Relief valves and nearby powerlines/transformers

Part of the issue is "power lines" is very vague. 400V or 400kV?

You find things underneath power lines without an issue.

I will admit it looks bad, but is it really bad? The lack of any code or standard tells you something.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Relief valves and nearby powerlines/transformers

"In all my years of gas engineering I have never had a relief valve in close proximity to powerlines." I think that just might say more than the absence of a code paragraph. I've not seen it either, in my 45 yrs doing this and I'm pretty sure nether has LittleInch. We do know that reliefs must be piped to "a safe location" and I'm not convinced that's all that safe, not yet even considering an ice storm could break the wires, or a bird gets fried, or shot at. 2/3 of dead birds found along the electrical RoW in Western US were shot! There's just are not a whole lot of (+) on the list, so surely there are better options.

I don't know the relief flowrate or the distances involved, the prevailing wind directions, so maybe it isn't a problem, but you're here, so I assume you feel some risk is there. If you can't prove the risk is absent, do something else. Buy a few more feet of vent pipe and route the outlet to a better location. Sleep peacefully.

https://www.nytimes.com/2023/08/03/science/birds-s...
Bird BBQs
https://m.youtube.com/watch?v=Mw7mR6Hjew4
https://youtu.be/TIfg7hYUWpg?si=mPQ1ltZwbr3m8KSz
https://youtu.be/tN9vZcAN0co?si=36Jbm4204NtzHIdk
Skip to the end.
https://m.youtube.com/watch?v=SFMiPtubk0Q&pp=Q...

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

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