| Re: [GMCnet] Propane Tank Aux Connections - teflon tape [message #316691 is a reply to message #316685] |
Thu, 27 April 2017 10:23   |
emerystora
Messages: 4442
Registered: January 2004
Karma:
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Senior Member |
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> Sent: Wednesday, April 26, 2017 7:57:27 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Propane Tank Aux Connections
>
> J, thanks for the information on the fittings...however, you should consider using yellow teflon, it is only teflon approved for propane. white is for
> water and may leak over time if used on propane. The big box stores carry it.
> --
> Sean and Stephanie
> 73 Ex-CanyonLands 26' #317 "Oliver"
> Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
>
> Colonial Travelers
>
Actually, the color does not mean that it is a different formula. When a thread seal tape was first introduced, it only came in a single density type (“white Teflon tape“) that was commonly found in large home improvement stores. Later they began making a double density version, which was twice as thick in the same color (unfortunately with the same “white” color). White will not necessarily leak if used on propane. It is just that propane requires a tighter seal. The double density white is the same as the yellow.
Since many state and local codes adopted the use of double density tapes when making connections for natural gas, the use of same color for two different thickness presented a challenge when time came to inspect a job. Thus, a “yellow TEFLON tape” was later introduced for such application.
Since then, ASTM has broadened the specifications for PTFE tape colors:
White Single or double density, should only be usd on NPT threads up to 3/8” in diameter.
Yellow - double density, often labeled as “gas tape”.
Pink - triple density, required on all joints 1/2” or larger.
Green - oil free PTFE tape, required for use on all lines carrying oxygen (medical oxygen or welding oxygen)
Emery Stora
77 Kingsley
Frederick, CO
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