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Forums» Plumbing, Mechanical and Fuel Gas Codes» Natural Gas Pipe in Concrete Slab

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Natural Gas Pipe in Concrete Slab
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Re: Natural Gas Pipe in Concrete Slab By  dsjtecserv

Posts: 0

4/19/2007 5:23:00 PM

I don''t know the answer to the first question, if there is one. The main purpose of the sleeve is to contain any leakage, so I''m not sure the size matters. With respect to the second question, everything in the IFGC and Chapter 24 of the IRC applies to both natural and LP gas unless the section states otherwise.

Wish I could be of more help.

Dave


   

Re: Natural Gas Pipe in Concrete Slab By  Uncle Bob

Posts: 0

4/19/2007 6:20:00 PM

InspMO,

2003 IRC;
G2415.4 (404.4) Piping through foundation wall.
Under-ground piping, where installed below grade through the outer foundation or basement wall of a building, shall be encased in a protective pipe sleeve. The annular space between the gas piping and the sleeve shall be sealed.

I don''t know why there is not more specific requirements in this section; but, Chapter 26 is more specfic and explains the purpose better;

P2603.5 Pipes through footings or foundation walls.
Any pipe that passes under a footing or through a foundation wall shall be provided with a relieving arch; or there shall be built into the masonry wall a pipe sleeve two pipe sizes greater than the pipe passing through.

(Specifies that the sleeve shall be two pipe sizes larger)

and;

P2603.4 Sleeves.
Annular spaces between sleeves and pipes shall be filled or tightly caulked as approved by the building official. Annular spaces between sleeves and pipes in fire-rated assemblies shall be filled or tightly caulked.

(the protective sleeve must be filled with caulking)

The purpose of the sleeve is to "keep building loads off piping" that passes through the footing or foundation walls.

In other words to prevent settling from crushing or cracking the pipe.

You can find pictures in the code commentraries.

Hope this helps :)

Uncle Bob


   

Re: Natural Gas Pipe in Concrete Slab By  hearthman

Posts: 0

4/19/2007 6:32:00 PM

Section 404.4 is for foundation walls. Go to 404.6 for piping in solid floors. According to the IFGC Commentary, you can install piping in a concrete slab only is it is installed in an open channel or sealed non-corrosive conduit. The only discussion about sizing is with respect to the conduit extending at least 2" past the slab and that the conduit can be tightly sealed. It would be prudent to make the conduit large enough for a little flexion but also to facilitate pulling the pipe should the need arise.

With respect to NG verus LP and gas piping, once you hit the point of delivery, the IFGC takes over. So, with NG, the DOT regulates it up to the exit fitting coming out of the meter. With LP, NFPA 58 regulates it up to the 2nd stage regulator and the IFGC takes over once it leaves this regulator.

HTH


   

Re: Natural Gas Pipe in Concrete Slab By  Guy Mitchell

Posts: 0

4/25/2007 9:52:00 AM

I believe the concern would be, how do you seal the enclosure to the gas pipe material? Not the size of the gas piping enclosure.

The gas piping enclosure must be sealed & vented to the outdoors to contain a gas leaks. Blazing or welding as worked for me in the past.

Good Luck


   

Re: Natural Gas Pipe in Concrete Slab By  DaveW

Posts: 0

4/26/2007 7:18:00 PM

Generally speaking 2" works fine, as stated above it''s just a vent. Sealing (air tight) it at the interior entry point so it will vent outdoors. Seen lots of those in California. Really simple when you think about it. :p


   

Re: Natural Gas Pipe in Concrete Slab By  beach

Posts: 0

4/27/2007 6:47:00 AM

2" ABS sleeve with a 3/4" or 1" vent tapped off the 2" ABS to outside air, 2" ABS sealed with expanding foam at each end that is located inside
of building. Like Dave said, typical in Calif.


   

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