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Open Roads Forum  >  Tech Issues

 > Capping off a propane line: need tips and tricks!

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profdant139

Southern California

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Posted: 05/22/19 11:52am Link  |  Quote  |  Print  |  Notify Moderator

After great effort, I just now found my very slow propane leak (and I will soon prepare a fascinating [emoticon] report on the many things I learned while trying to find it). Bottom line – the leak is at the point that the external barbecue fixture connects to the propane system.

What I want to do is remove the barbecue fixture – we never use it. And I want to cap off the stub or nipple that "tees into" the propane line. The pipe is galvanized. It appears to have an ordinary pipe thread -- not a flared brass gas fitting.

I am planning to unscrew the existing reducing bushing (I think that is what it is called) and replace it with a galvanized cap. I will use teflon gas tape at that joint.

My real question is this: I don't want to put any stress on the other galvanized propane lines underneath the trailer. I will hold back on the galvanized nipple with a pipe wrench while unscrewing the existing reducing bushing. The bushing is very rusty -- I anticipate having to use a lot of force to unscrew it. I'm planning to spray it with WD-40 a day or so before unscrewing it, to try to loosen the threads.

Does this sound like the right approach? I am not a plumbing or propane expert, as you can tell.

Thanks in advance for your suggestions!!


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wrktfsh

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Posted: 05/22/19 11:57am Link  |  Quote  |  Print  |  Notify Moderator

That’s how I would do it. Use pipe dope on the threads. Turn off gas first

Chris Bryant

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Posted: 05/22/19 11:59am Link  |  Quote  |  Print  |  Notify Moderator

Should be black iron, not galvanized, but other than that, it’ll be fine.


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Old-Biscuit

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Posted: 05/22/19 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

YEP....
Always use 2 wrenches
1 to HOLD existing pipe and 1 to use to remove other pipe/nipple etc

Pipe dope the threads (yellow tape will work....several wraps)


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MrWizard

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Posted: 05/22/19 03:45pm Link  |  Quote  |  Print  |  Notify Moderator

i prefer 'Kroil' or 'PB blaster' much better penetration, bushing will come out easier

I would use a Brass cap, and Yellow Teflon tape is for Gasses, white Teflon is for liquids


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Bobbo

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Posted: 05/22/19 08:59pm Link  |  Quote  |  Print  |  Notify Moderator

profdant139 wrote:

I'm planning to spray it with WD-40 a day or so before unscrewing it, to try to loosen the threads.

Contrary to popular belief, WD40 is not a penetrating lubricant! Get some PB Blaster. Best stuff on the face of the planet for what you are doing.

On a related note, personally, I prefer pipe dope to PTFE tape.


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MrWizard

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Posted: 05/22/19 09:40pm Link  |  Quote  |  Print  |  Notify Moderator

i agree with the pipe dope on a capped line

tape can sometimes be a PITA to use

profdant139

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Posted: 05/22/19 10:34pm Link  |  Quote  |  Print  |  Notify Moderator

Some great tips -- thanks! I hope to avoid becoming a "pipe dope."

LarryJM

NoVa

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Posted: 05/23/19 01:48am Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

i prefer 'Kroil' or 'PB blaster' much better penetration, bushing will come out easier



I agree "PB Blaster" (My preference) is XXX times better than WD40. Best to let the PB Blaster work for a day or two reapplying as necessary to keep fitting wet. It takes time for the PB Blaster to really be effective so it's not a quick one step process.

Larry


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wa8yxm

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Posted: 05/23/19 06:01am Link  |  Quote  |  Print  |  Notify Moderator

There is a different dope for gas threads (I think it is yellow in color) and they generally use "Black Iron" pipe.. any hardware. ANY hardware department. Just take the old fitting in so you have the right size.


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