Some people's kids...

scrook_2

should behave like about a 45' feet of 1.25". Gas company providing a big meter?

Timco

I sized a gas line for a friend who has a re-model going on, and stopped by to have a look. The stub in is 1" and I called out for 1.25" based on all equipment pulling from a manifold in the mech room. This is what they came up with...(I snuck in a pic of my finished mod-con from the other day)

Tim

jp_2

how many

Btu's can the section of, looks like 1", can carry?

scrook_2

depends...

How long the 1" section is and how many fittings?

Looking at a natural gas sizing table, for 1/2" pressure drop: 10 ft of 1" is about comparable to 40 ft of 1.25" and 20 ft of 1" is about comparable to 75 ft of 1.25" -- rough numbers mind you, but you get the idea.

Looking it it another way: 100 ft of 1.25" will carry just over 400,000 BTU/hr, for the same BTU's and drop a 1" pipe is limited to about 23 ft.

What's the peak load and how long's the 1" run?

scrook_2

depends...

How long the 1" section is and how many fittings?

Looking at a natural gas sizing table, for 1/2" pressure drop: 10 ft of 1" is about comparable to 37 ft of 1.25" and 20 ft of 1" is about comparable to 75 ft of 1.25" -- rough numbers, but gives a sense.

Looking it it another way: 100 ft of 1.25" will carry just over 400,000 BTU/hr, for the same BTU's and drop a 1" pipe is limited to about 23 ft.

The ratios would be similar for propane, though the the absolute capacities for a given size or length would be somewhat higher.

What's the peak load and how long's the 1" and the 1.25"?

Dan C._4

meter

The meter is probably 3/4" anyway. I never understood that. They do the same thing on water services.

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Timco

Run is 35'total, and load is 410K BTU peak. It was 610K, but he axed the tankless and went with a 40K btu WH. The 1" is about 3' total from meter, and the 1.25" is 32' or so.

My gas table book is in the truck...BRRRRRRRRRRRRR!!! I'll check it tomorrow, unless one of 'yall have an opinion.

Tim

Bob Bona_4

sounds

like the 1" appears as just another elbow in the scheme of things, Tim.

I'm taking it the meter is sized to handle the cubic feet needed?