nighthaw2k
Member
I'm planning on running a gas line from the house to my garage & was wondering what size line i would need. It is going to be a 200 foot run. I'm going to be hooking up a 75,000 btu heater.
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What size gas line for 200ft run
- Thread starter nighthaw2k
- Start date
rasit
Well-known member
Here's a great download calculator from Wardflex. You input the specs for your proposed system and it will tell you what size pipe you will need based on distance and demand.....
http://www.wardflex.com/sizing.htm
http://www.wardflex.com/sizing.htm
theoldwizard1
Well-known member
What is the pressure on a typical gas line coming from the street ? What is it after the regulator ?
With such a long run, would he be better off having the gas company tap in ahead of the regulator/meter and run out to the garage with another regulator/meter ?
With such a long run, would he be better off having the gas company tap in ahead of the regulator/meter and run out to the garage with another regulator/meter ?
rasit
Well-known member
What is the pressure on a typical gas line coming from the street ? What is it after the regulator ?
With such a long run, would he be better off having the gas company tap in ahead of the regulator/meter and run out to the garage with another regulator/meter ?
The pressure from a gas main off the street or from a propane tank is considered the high side and can vary from 30psi to 150psi or more. After the regulator on a natural gas system the pressure is 7"-8"WC (inches of water column) and 11"-13"WC for propane. "Inches of water" is basically how much pressure is required to push water in a tube and is measured with a manometer. This is very low pressure. The problem the OP is likely to face is the existing pipe in the house will not be large enough to tap off a 200' run for a 75,BTU demand. By using the calculator link I provided, he would enter all of his existing info, including where in the system it will be tapped, and it will tell what size pipe is required. Typically you start off with larger pipe at the regulator and pipe size decreases the farther along the system you go to minimize pressure loss.
The solution (and best way to go) is to tap ahead of the regulator and add another regulator at the garage as suggested. Gas work should only be done by a qualified person for obvious safety and insurance reasons. It would really **** if the house blew up........
theoldwizard1
Well-known member
WOW ! I never knew it was that low !! (About 0.25 psi)After the regulator on a natural gas system the pressure is 7"-8"WC (inches of water column) ...
littletoes
Well-known member
Oh yea, gas suppliers are very "spot-on" on their gas pressure. 7'' without a variance. That is how they figure your bill, if you got a "bit more", then they would loose money.
Yes, you CAN have your house pressure boosted up to 2 pound gas, but then you would need to add an additional regulator for the house, and another for the gas line to the shop, PLUS, there are usually laws that require any buried piping downstream of the meter to be tested at least once for leaks every two years, AT THE OWNERS EXPENSE.
It might just be easier to add an additional regulator, and on occasion the gas company will do the work for free.
Remember, most older gas meters are only rated for 275,000 btu's, with newer meters good to 300,000 btu's, so be sure to add all btu's up in case you need to have a bigger meter set in place.
I have a friend that has done the same thing....200 foot of run to his shop. He ended up having to use 2" pipe.
I have the tables for figuring size, and its very simple, but you will need to know ALL btu's needed, with footages to all equipment.
Good Luck!
Yes, you CAN have your house pressure boosted up to 2 pound gas, but then you would need to add an additional regulator for the house, and another for the gas line to the shop, PLUS, there are usually laws that require any buried piping downstream of the meter to be tested at least once for leaks every two years, AT THE OWNERS EXPENSE.
It might just be easier to add an additional regulator, and on occasion the gas company will do the work for free.
Remember, most older gas meters are only rated for 275,000 btu's, with newer meters good to 300,000 btu's, so be sure to add all btu's up in case you need to have a bigger meter set in place.
I have a friend that has done the same thing....200 foot of run to his shop. He ended up having to use 2" pipe.
I have the tables for figuring size, and its very simple, but you will need to know ALL btu's needed, with footages to all equipment.
Good Luck!
fishheds
Well-known member
You didn't specify if you're LP or natural so I'll assume natural.
If you're going to run 200 feet to the shop from the meter/manifold,from a cost basis,you'll definitely want to be on a 2psi system.
Anything 1 to 5 psi is considered medium pressure,but most newer homes are on a 2#system with dedicated 2# to 7" regulators on each appliance.
What you're gonna wanna do is run CTS.Look here.http://www.elster-perfection.com/en/downloads/GasRisersTransFittings_Singles_(4).pdf
1/2" should be plenty on a 2# system,then make the transition to the 7" operating pressure,usually with a maxitrol R325 series or equivalent regulator.
If you're going to run 200 feet to the shop from the meter/manifold,from a cost basis,you'll definitely want to be on a 2psi system.
Anything 1 to 5 psi is considered medium pressure,but most newer homes are on a 2#system with dedicated 2# to 7" regulators on each appliance.
What you're gonna wanna do is run CTS.Look here.http://www.elster-perfection.com/en/downloads/GasRisersTransFittings_Singles_(4).pdf
1/2" should be plenty on a 2# system,then make the transition to the 7" operating pressure,usually with a maxitrol R325 series or equivalent regulator.
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swvega
Well-known member
check with your gas co. it may be cheaper to have them run the line and have a second metor bill.
HoosierBuddy
Well-known member
Oh yea, gas suppliers are very "spot-on" on their gas pressure. 7'' without a variance. That is how they figure your bill, if you got a "bit more", then they would loose money.
Good Luck!
It's not that simple. Atmospheric pressure figures into it too. Gas customers at altitude typically recieve higher gauge pressure to compensate for the fact meters are rated at sea level.
If a meter is at 600 feet above sea level, 2 inches additional w/c would make it accurate. Higher elevations would require more pressure. Contact your gas company (or use a manometer) to check for sure.
Phil
fishheds
Well-known member
The distribution supply pressure is regulated just upstream of the meter,which measures volume,not pressure.
ForceFed70
Well-known member
I just ran a 200' gas line to the shop I am building. If you are connecting right at the meter, you can probably get away with a 3/4" or 1" line. Use the calculator to find out for sure.
For my shop, I am planning to run a 75,000BTU heater along with a 60,000BTU hot water tank and a 60,000BTU. I needed a lot more gas than what you are planning and the only way to do it was to upgrade to a 2lb system. It wasn't a big deal actually, the utility swapped out my 1/2lb meter to a 2lb meter/regulator combo for free.
For my shop, I am planning to run a 75,000BTU heater along with a 60,000BTU hot water tank and a 60,000BTU. I needed a lot more gas than what you are planning and the only way to do it was to upgrade to a 2lb system. It wasn't a big deal actually, the utility swapped out my 1/2lb meter to a 2lb meter/regulator combo for free.