NG pipe sizing

ChrisJ

Hi all,

I'm hoping someone can just quickly double check my work here to make sure I'm not being a dope.
These are the sizes I came up with for piping and the incoming line just seems a bit much to me. Am I way off or is this about right?

Supply pressure is 6", although after the meter 5.5" seems more realistic. They give me so much extra to play with..........

Please see the two attached drawings. Hopefully they work.

Alan (California Radiant) Forbes

Yes, a bit too much from what I can tell.

Table 12-8 in the 2009 Uniform Plumbing Code will allow you to run 1-1/4" schedule 40 pipe and will supply 528 cubic feet a maximum of 60 feet.

Inlet pressure less than 2 psi, with no more than a 0.5" pressure drop.

EBEBRATT-Ed

@ChrisJ
your good to go. I used low pressure gas chart .05"wc pressure drop

ChrisJ

Alan (California Radiant) Forbes said:

Yes, a bit too much from what I can tell.

Table 12-8 in the 2009 Uniform Plumbing Code will allow you to run 1-1/4" schedule 40 pipe and will supply 528 cubic feet a maximum of 60 feet.

Inlet pressure less than 2 psi, with no more than a 0.5" pressure drop.

Hi Alan,
I came up with 80 feet as the longest run when taking fittings into consideration. But I'm also concerned I did it wrong.

I'd much rather 1 1/4 to be honest.....

Alan (California Radiant) Forbes

At eighty feet, you can deliver 452 cubic feet. Looks pretty good for 1-1/4" pipe, especially with your boiler coming off early.

Alan (California Radiant) Forbes

P.S. Check with your local gas supplier for density. Here, it's 1,000 BTU's per cubic foot.

ChrisJ

Alan (California Radiant) Forbes said:

P.S. Check with your local gas supplier for density. Here, it's 1,000 BTU's per cubic foot.

I think I had actually asked back in 2011 but I'm not remembering the actual answer. I don't like this getting old stuff....

Does the btu content effect what appliances actually flow? I assumed they would still flow the same amount and just deliver slightly less or more based on the content?

ChrisJ

EBEBRATT-Ed said:

@ChrisJ
your good to go. I used low pressure gas chart .05"wc pressure drop

Do you think I could get by with an 1 1/4 on the first section, or too close?

ratio

Odds are you won't notice the difference going with 1¼". something like 70-80% of the gas lines I come across in the wild are undersized according to the old tables, but only like 10-20% of the equipment gives me trouble.

Can you get the 1½" cut & threaded at a big box store? If they get the dies in the right order, they'll usually pull up tight enough.

ChrisJ

> @ratio said:
> Odds are you won't notice the difference going with 1¼". something like 70-80% of the gas lines I come across in the wild are undersized according to the old tables, but only like 10-20% of the equipment gives me trouble.
>
> Can you get the 1½" cut & threaded at a big box store? If they get the dies in the right order, they'll usually pull up tight enough.

I'll be using my 65R-TC

EBEBRATT-Ed

@ChrisJ

Yes, 1 1/4 is fine for the first section.