underground Galvy

kcopp

Looking at NFPA 54 they still allow gas piping underground using galvanized steel piping. Would that be any different w/ LP gas?
I would use the ConStab set up but the tees outrageously expensive.

hot_rod

This is an older version of NPGA 4001, it does allow galvanized pipe. Possibly some local codes might have an addendum preventing it. Local LP providers would have the best answer.

kcopp

Thank you much HR.
This town in Maine has little in terms of regulation.

JUGHNE

Small OD soft copper, (Type L or K) will carry a lot of LP at the higher pressure of 10 PSI or so to the 2nd ounces regulator on the structure. Sleeve both ends above ground to protect from weed eater etc.

I have seen a few 50-60 year old LP installs. Always too small of a copper, one reg at tank....equipment was not fussy then...nor were the customers....relight pilots...no big deal. But the one case with galv fittings the furnace gas valve inlet screen was nearly plugged with flakes of some sort. Never saw this with all copper. FWIW

Tim McElwain

Old galvanized was a real problem with small pieces flaking off and plugging up pilots. We never allowed it on our lines or in house piping. We also did not like copper tubing for gas pilot lines preferred the aluminum tubing.

ratio

What makes the aluminum better than the copper?

kcopp

I believe its because of the flaking issue again. Also I think it is less prone to corrosion if the sulfur content of the gas is higher....

Tim McElwain

One of the problems with any metal pipe underground is electrolysis causing corrosion of the pipe. It needs to be wrapped or protected by an anode system to prevent corrosion. Utilities today are running plastic pipe for mains and services which eliminates the corrosion issue.

kcopp

I just wish the tees were more reasonable in cost.... $$$!!