Looking at a basement rental NG furnace, I noticed that the black steel gas
pipe was joined to the gas valve with a 6" length of 1/2 copper pipe. Is
this legal? Safe? Should not only the black steel, approved for gas pipe be
As part of a refit am replacing gas line anyway. Also take precaution of
always turning off at the propane bottle/tank, a 15 pounder in a separate
ventilated locker at stern of boat, when cooker not in use. However there
will always be gas in the pipe.
PS. Is it because of certain impurities (maybe sulphur etc.) in NG that
It's not the "gas" in natural gas that's the problem--it's the sulfur as
Terry suspects (normally in the form of the sulfide (H2S) combined w/
the entrained moisture that's the culprit...
LP's do tend to be "purer" owing to the liquification process that
produces them from NG...
Here's a study from So Cal Ed on corrosion effect of NG on Cu tubing...
I don't know as I agree fully w/ their assessment that the localized
pitting is innocuous as a failure mechanism but I'm not a real
metallurgical type (but I don't get the feeling the folks who did this
study were, either). I do recall a particular product I worked on where
corrosion attack on SS was dramatic although localized. I can envision
similar phenomenon w/ Cu but that's just a "gut feeling", not
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