Running gas line..

[BellyUpFish]

Ok, so I'm looking at running gas line for a heater for my detached garage.

So, I'm looking at the best way to do it. For insurance purposes, I'm going to let a plumber come do the final hookups, but I'll be running the pipe, etc with him inspecting it, per his suggestion. I'm just not wanting to pay him to do it all and he understands that.

I've spoken with the plumber and he's 50/50 on the directions I could go. "It's really up to you.."

So..

Scenario A) T off an existing gas line under the house for the gas range and come out of the foundation and run underground for ~100' to the shop.

Scenario B) T off the supply after the meter and run underground around the perimeter of the house and into the shop. Around 450' total run.

On one hand, the additional gas line under the house gives me a little pause, but there is gas there already so, it's kinda moot.

Scenario B is more work, but it will keep the gas out from under the house.

I know some of you guys will have an opinion so I seek it.

Anyone?

 

[CNGsaves]

Well at face value, your best option is clearly OPTION A which is shorter at 100 ft to detached garage (supplied through house basement) . . . . vs . . . . 450 ft if you go all outside from the meter.

However . . . . . still . . . . . TOO LITTLE Information.

GJer's will need the following information to make informed decision:

a) PRESSURE of your incoming NG supply past the meter (likely only 7 to 10 inches of Water Column . . . . roughly 1/2 psi)
b) SIZE of incoming supply black pipe steel after the meter to where it feeds any other NG loads in the house (ie furnace, NG range, NG dryer, NG water heater, etc)
c) DISTANCE of pipe from meter to where all the above happens (ie distributed out)
d) NUMBER OF ELBOWS in the supply pipe for all of the above (meter to distribution)
e) BTU of all house NG appliances
f) Also NUMBER of Elbows for the mixed pipe run to detached garage
g) Finally . . . need . . . . BTU OF NG HEATER you want in detached garage

Just a pure WAG if only 1/2 psi . . . I'd want 2" or more from the meter down into the basement, then 1 1/4" of black pipe steel (BPS) in basement until it gets outside. Then tie BPS to riser outside (above grade) that converts to yellow plastic polyethylene buried pipe also at 1 1/4" (possibly more) for the 100 ft to the detached garage, with another riser outside to transition to BPS (above grade) that enters the garage.

 

[zmaxmotorsports]

Well at face value, your best option is clearly OPTION A which is shorter at 100 ft to detached garage (supplied through house basement) . . . . vs . . . . 450 ft if you go all outside from the meter.

However . . . . . still . . . . . TOO LITTLE Information.

GJer's will need the following information to make informed decision:

a) PRESSURE of your incoming NG supply past the meter (likely only 7 to 10 inches of Water Column . . . . roughly 1/2 psi)
b) SIZE of incoming supply black pipe steel after the meter to where it feeds any other NG loads in the house (ie furnace, NG range, NG dryer, NG water heater, etc)
c) DISTANCE of pipe from meter to where all the above happens (ie distributed out)
d) NUMBER OF ELBOWS in the supply pipe for all of the above (meter to distribution)
e) BTU of all house NG appliances
f) Also NUMBER of Elbows for the mixed pipe run to detached garage
g) Finally . . . need . . . . BTU OF NG HEATER you want in detached garage

Just a pure WAG if only 1/2 psi . . . I'd want 2" or more from the meter down into the basement, then 1 1/4" of black pipe steel (BPS) in basement until it gets outside. Then tie BPS to riser outside (above grade) that converts to yellow plastic polyethylene buried pipe also at 1 1/4" (possibly more) for the 100 ft to the detached garage, with another riser outside to transition to BPS (above grade) that enters the garage.

 

[bczygan]

Might need a bigger service and meter.

 

[BellyUpFish]

a) PRESSURE of your incoming NG supply past the meter (likely only 7 to 10 inches of Water Column . . . . roughly 1/2 psi).

Oh, good question. No clue what the pressure is.

b) SIZE of incoming supply black pipe steel after the meter to where it feeds any other NG loads in the house (ie furnace, NG range, NG dryer, NG water heater, etc).

Pipe after the meter is 1.5". Runs under the house all appear to be 3/4".

We only have a gas water heater, heat pump and the range.

c) DISTANCE of pipe from meter to where all the above happens (ie distributed out).

Meter to the load distribution is less than 20'.

d) NUMBER OF ELBOWS in the supply pipe for all of the above (meter to distribution).

Elbows would be less than 10.

e) BTU of all house NG appliances..

Gonna have to look this up.

f) Also NUMBER of Elbows for the mixed pipe run to detached garage.

That run would probably require at a minimum 5 elbows.

g) Finally . . . need . . . . BTU OF NG HEATER you want in detached garage.

Was aiming for 100,000BTU. I have 1,800sq ft.

 

[BellyUpFish]

Might need a bigger service and meter.

We had them spec a gas heater in the list of "expected appliances." They ran 1,300' of 2" (I believe) pipe to the house.

 

[CNGsaves]

Might need a bigger service and meter.

^ ^ ^ Good point. This might need discussed if the heater in garage is awful large and the house NG meter is pretty much maxxed out with all the NG appliances for the house.

OP . . . is this new garage build you've done ?? Or are you improving the heat with a hanging NG heater to existing garage ??

 

[BellyUpFish]

^ ^ ^ Good point. This might need discussed if the heater in garage is awful large and the house NG meter is pretty much maxxed out with all the NG appliances for the house.



OP . . . is this new garage build you've done ?? Or are you improving the heat with a hanging NG heater to existing garage ??

New build. Just built the house and the garage.

When we submitted for the NG feed a 100k BTU NG heater along with all our other loads was sent with the application and I was told we'd be fine when it came time to hook it up.

We also wound up going with an electric cooktop rather than the gas cooktop, but the line was already run when the wife changed her mind.

Only NG loads we currently consuming NG is the heat pump and the water heater.


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[CNGsaves]

^ ^ Cool . . . NEW BUILD . . . . we GJer's just LOVE new builds !!!

Do you have a thread started in GALLERY section of GJ ?? We love lots of PIC's !!

Sounds like you're well planned out with the NG supply service, in anticipation of the 100K Btu heater in detached garage. Wow @ 1800 sq ft that sounds HUGE !!! Likely your meter is already oversized compared to typical residential.

Let me take look at NG pipe flow calculator now that we know you've got large 100K Btu heater in detached garage.

 

[BellyUpFish]

I haven't started a thread. Kinda going back and forth on it. I guess I need to.


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