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Propane gas line

3

37chief

Well-known Member
Location
California
I would like to supply a small house with propane. It has one cook stove one wall heater one on demand water heater. The house tank I want to tap into has one,
forced air heater, one gas stove. one standing water heater. That house has a 3/4 inch pipe. can I run both houses with 3/4 inch pipe? Both houses will be 25 ft from the main tank. Thanks, Stan
 
I don't think you would have any problem with that. I can't be sure without seeing the system myself. But at most you would do a two stage system with a first stage at the tank and second stage at each house.
 
some of the heaters themselves uses a 3/4 supply line so I don't know if a 3/4 will run everything or not
 
I didn't notice the on demand water heater. You most likely need the two stage if you don't already have one unless it is a smaller water heater. Are you running a line from the tank or tapping into the other house line?
 
I have run my house on a 20# grill tank and my house is plumbed with a 3/8 cooper line from the 500 gal tank. We ran two houses on one line back in the 70s, on a single 3/8 line.
 
I believe with the BTU draw that you will have you will need a 2 stage system with a first stage regulator at the tank and a second stage at each house after the tee. Even coming from the tank with both it would still be the best way to go. Keep in mind coming from the house makes locating a leak a little harder so you might consider a few shut offs to help narrow it down if that time ever comes.
 
Experiance tells me you will need to 2 stage that set up but whomever supplies your propane should be able to tell you for certain.
 
On demand water heaters use a lot of gas, I would think you need to run a separate line. Each appliance should have a tag the stated the btu rating.
 
If you were to open that 3/4 line & throw a match at it would the size of the flame exceed the total of all the burners? I think so!
 
I think it would be fine. Look at the supply line size on camp trailers... and you can run the water heater, furnace, fridge, and all 4 stove & oven burners at the same time.
 

I don't recommend you tap into the low pressure side of the regulator on one house and run a line from there to the other house, most likely you'll have a flow issue at high demand times.
It's best to tee off a second line at the tank and adding another low pressure regulator at the second house.
If there's a high pressure regulator at the tank you should tee in after that regulator.

What your wanting to do is similar to how we plumbed from a single tank to mom's house and a mobile home next door.
 

What Destroked 450 said...

My set up is NG.

My set up is similar, the on demand water heater is tapped off the supply before the low pressure regulator to each building and has its own regulator. My gas grill it the same the gas co. did all the hook ups...
 
The furnace on a travel trailer is about 30,000 BTUs. An on demand water heater may run 200,000 by itself. Plus the longer the line the more pressure drop requiring larger size or a two stage system.
 

Do those on demand water heaters have low pressure or high pressure burners, that would determine how they are plumbed.
A good high volume low pressure regulator should flow enough to supply everything in the house including the water heater if it has a low pressure burner.
We run two 250,000 but heater in the back of our poultry barns, 1st heater was 250 ft from the regulator and 2nd one 325 ft, used 1" pipe with 1/2" hose whip's to the heaters, some of the piping was 2" but altogether the brooders and heaters equaled 1.6 million btu per house, all low pressure heaters.
 
A standard second stage regulator will supply around 750,000 BTUs. The Issue isn't the regulator its the pipe size combined with distance to the appliance. I doubt anyone makes a high pressure indoor appliance for residential use due to code requirements. Just FYI high and low pressure regulators aren't really the same thing as first and second stage even though some use the terms that way.
 
If it is worth doing ---- do it right -- lots of good advive here.
If it isnt done right -- say every thing came on at once it could drop the pressure enough that the piolet light to go out (if it isnt electronic) and your house freezes up when you are away. If you are going to cut corners and halfa$$ it be sure to check the pressures when it is really cold out and the tank is near empty. depending on where you are from I know from experience that a half full 500 gallon tank will stop working at -50f . So you are not likly to see this but cold affects the ability of the propane to vaperise --- plan accordingly.
 
How will the two separate household split the cost of the propane? Are they on a single electric meter too?

It might be worth asking one or more contractors for an estimate on what you intend to do. They will often give a verbal or written explanation of any safety problems or building code problems and a description of what they would do.
 
A standard second stage regulator will supply around 750,000 BTUs. The Issue isn't the regulator its the pipe size combined with distance to the appliance. I doubt anyone makes a high pressure indoor appliance for residential use due to code requirements. Just FYI high and low pressure regulators aren't really the same thing as first and second stage even though some use the terms that way.
 
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