Sizing a gas line

[Ultradog MN]

We have natural gas heat here.
We're looking ahead to getting older here so I am adding all the hook-ups for a stackable washer/dryer in a closet on the first floor.
Won't have to go down to the basement to do laundry then.
I also want to size this for gas to the garage.
Hope you can follow my crude drawing.
Any gas plumbers here?

 

[kevinj54]

For anyone to help they will need the btu for all connected loads & the btu capacity of the meter.

 

[Ultradog MN]

For anyone to help they will need the btu for all connected loads & the btu capacity of the meter.

Thanks.
I'll try to get some numbers.
Edit:
I looked on some of the appliances and the meter but am not finding that info.
If it helps:
Standard 40 gal WH
Two gas dryers
30" range
Two 75000 btu furnaces

 

[Hemmjo]

Thanks.
I'll try to get some numbers.
Edit:
I looked on some of the appliances and the meter but am not finding that info.
If it helps:
Standard 40 gal WH
Two gas dryers
30" range
Two 75000 btu furnaces

Your drawing shows you drop down to 1/2" pipe after the first 18 ft, then run another 92 ft to the garage. 80' is 1/2" pipe is limited to 75k BTU.

You also need to know the pressure in your system, typically 1/2" water column. Also is your gas natural or propane.

Here is a link to some numbers you can use to revise your design. You also have to take into consideration any fittings you put into the line adds to the "footage" way more than he actual length of the fitting. From the chart you will notice that a T is the worst offender for flow restriction. A 1/2" -T creates the same frictional loss as 4' straight pipe. 1"- T equals 6' of pipe.

Links;

Gas line size/length/BTU chart
Feet Equivalent for pipe fittings

 

[TerryfromSWIowa]

Very first sentence says natural gas.

 

[Mexico46958]

Need input Btu of each appliance. Distance (feet) to the furthest appliance. Add any additions for future appliances or loads. I still have my sizing charts for natural gas at various pressure drops. Verify that Btu of your natural gas is near 1000 Btu per cubic foot. Verify inlet pressure (normal at 6 inches water column). Most residential meters are good for 200 CFH flow, exceeding usage will cause pressure drop across the system. May be charges to upgrade meter to meet expected flow.

 

[Janicholson]

Black Iron pipe is going to be needed for the main line I believe it should remain 1 inch for another 16 feet. to the new dryer. from there it probably can be 3/4 inch all the way to the garage. where the (I assume)a furnace is located.
If your local utility inspection and regulation allow, I would suggest looking into stainless steel piping to all appliances from that main black iron. It is flexible and far easier to make joint dree connections end to end. It is sold in lengths and a great solution. The underground components must be of approved material and protection from both crush vehicle, and soil conditions/moisture. Once you put a plann together and find out code requirements, a permit and inspections are needed in almost every place I have been. It is a valid reason to have piece of mind to be in compliance and not take our opinion for facts. I have installed gas service in both new construction, and repaired old installations as well as modified new installs for added appliances. Jim

 

[DoubleO7]

Is that meter and regulator inside your house?
I never seen that before.
How does the meter reader get the reading every month?

 

[redtom]

We have natural gas heat here.
We're looking ahead to getting older here so I am adding all the hook-ups for a stackable washer/dryer in a closet on the first floor.
Won't have to go down to the basement to do laundry then.
I also want to size this for gas to the garage.
Hope you can follow my crude drawing.
Any gas plumbers here?

Two winters ago I teed at my meter and ran 130 ft of yellow 3/4 tubing to my shop and am running a 100k btu heater with no problem. My house is 1 inch in to water heater/ furnace and 30 ft or so down to dryer. No issues yet.

 

[Russ from MN]

It depends on the pressure of your system, and you can tell that by if there is a regulator by each appliance. if there is, then you have a high-pressure system and can use smaller piping. We have a high-pressure natural gas system, so I ran 1/2 copper to the 40,000 btu furnace in my shop, and it works very well.

 

[Stan Coryell]

We have natural gas heat here.
We're looking ahead to getting older here so I am adding all the hook-ups for a stackable washer/dryer in a closet on the first floor.
Won't have to go down to the basement to do laundry then.
I also want to size this for gas to the garage.
Hope you can follow my crude drawing.
Any gas plumbers here?

We have natural gas heat here.
We're looking ahead to getting older here so I am adding all the hook-ups for a stackable washer/dryer in a closet on the first floor.
Won't have to go down to the basement to do laundry then.
I also want to size this for gas to the garage.
Hope you can follow my crude drawing.
Any gas plumbers here?

If you give me a single line drawing with total footage of the main and all branches. I can size it for you. The meter may need to be up graded, but I doubt it.

With everything listed running, I get 305 CuFt/Hr and 120' for the longest run (I added 10' for the garage)
1 1/4" past the first furnace, then 1" past the last branch, then 3/4" to the garage. These sizes are good past 150', almost to 175'.

 

[Stan Coryell]

My mistake. Your meter says 250 CuFt/Hr @ 1/2" Diff. You could call the gas company, but I doubt they will change the meter. If you delete one clothes dryer, that puts you at 274 CuFt/Hr with everything at 100%. Here in South Jersey, you would need a permit for the gas pipe from the township to get the gas company to change the meter. I personally wouldn't worry about the meter size.