Low pressure natural gas line 1

[jgailla]

My company is working on a project in North Florida on which we have to relocate several utilities. I know about the sewer, water, etc., but have not worked on a natural gas line before. My question is what standards are used, what materials and fittings are used, how do you avoid conflicts? Anything in particular to watch out for?

 

[BigInch]

Is this a private installation beyond the utility meter or is it work for the local gas distribution company. I think its probably private, since normally a LDC wouldn't let you work on their facilities unless you had prior experience. No matter, you should probably try to talk to the gas supplier to see if they might be willing to give you some specific hints.

As for your question, it depends on the existing design. Might be steel or Polyethylene, or even another material. No way for me to tell. Best thing is to get hold of the existing drawings and specifications. If you can do that, buying to the same specs may be a possiblity.

Last, get a local PE on a retainer fee. One that has some gas design experience. You'll probably need a PE sooner or later anyway. Take the opportunity to get to know one.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[Zapster]

Take a look at CFR 192 for fed regulations. There may also be some local and state regulations as well. I agree with BigInch about your need for professional help with this project.

Also look at:

http://ops.dot.gov/regs/small_ng/SmallNaturalGas.htm

And make a google search for:
UFGS 02556A

 

[BigInch]

Zapster, thanks for mentioning the codes. I forgot that part of the question. As Zap says, <if the pipeline is a federally regulated line>, CFR 49 Part 192 could apply (free download), if not, ASME B31.8 might be applicable, depending on the owner's requirements. The UFGS reference would apply to a Federal project, otherwise its just plain good info and free, so get a copy. Beware of state and local regs.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[jgailla]

Thanks BigInch and Zapster.
We will be getting an MEP to look at this.
It is a private gas line, low pressure (20-30 psi), about 2"-3". Part of the problem is that it was built in the 40's or 50's, so I'm worried about simply matching what's out there.
We've run into similar problems before. The architect will expect us civils to design the line since it's outside and the MEP doesn't want to do it for the same reason.

 

[BigInch]

No worries. In that case you might want to consider replacement with HDPE pipe and fittings. Let us/me know if you need something else. See the codes mentioned - nonmetallic sections.

Have a look here; a link to some typical HDPE pipe & fitting materials for gas distribution. See 6800 series. Study up on the Heat Fusion guide too.

http://www.leesupply.com/products_HDPE_pipe.html

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[vzeos]

Attached is the link to the Guidance Manual for Operators of Small Natural Gas Systems. Also check out the the side bar. You should find some good info here.

http://ops.dot.gov/regs/small_ng/SmallNaturalGas.htm