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Author Topic: Pipe material for natural gas application  (Read 6439 times)
Michael Sedillo
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« on: August 06, 2011, 10:37:21 AM »

Two questions:

Can galvanized pipe be used for natural gas to a water heater?


Can galvanized be attached to brass?

Mike
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Cameron Anderson
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« Reply #1 on: August 06, 2011, 05:46:06 PM »

Mike,

I can only address the first question because I had to study it over the last year a couple times.  From the standpoint of national standards, I was not able to track down a specific reference which would dis-allow galvanized pipe on natural gas.

But the local utility companies were different, I found many specific utility company standards and I even was able to locate the requirements of my local gas utility and they all stated that galvanized pipe was not allowed per their standards.  The reason was the same as the use of copper, the concern over corrosion and the potential for deterioration inside the pipe which would lead to a blocked valve on gas burning equipment.  I write it up as follows:

Galvanized water pipes are being used for gas lines at the <<LOCATION>>. Many municipalities and utility companies no longer allow the use of galvanized piping due to its potential for corrosion.
       UPGRADE: Recommend replacing all galvanized piping with a modern type of gas supply line to prevent potential damage to equipment.


I'll let someone else tackle the Brass/Galv. question.
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Casey Patten
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« Reply #2 on: August 06, 2011, 10:59:07 PM »

Mike, I believe that brass/galvanized need a dielectric connection or connecting may cause a reaction between the two.  There's also the water element of conductivity too. 

Did you see if there was some kind of plastic liner present at the connection?
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Stephen Stanczyk
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« Reply #3 on: August 07, 2011, 02:52:27 AM »

Regarding the galvanized to brass connection.  Is this for gas or for water?  Brass is commonly used transition between copper and galvanized steel.  Many AHJ will allow a 6 inch transition nipple which actually holds up better than a dielectric union.
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