[patrickpresti]

Hi Guys,

How do I go about sizing the appropriate natural gas supply lines for a new over and dryey install? I will give you any information that would be needed.

Thanks,

Pat

 

[patrickpresti]

As of now, the pipe size is 3/4" before the meter. After the meter it's 3/4" as well. Then it's 3/4" pipe to the boiler and 1/2" to the hot water heater.

Thanks,

Pat

 

[2x_Tom]

To properly size it we need the btu rating of your boiler, water heater, dryer and stove. The dryer and stove I could get close guessing, the boiler and water heater are the variable. We also need to know the distance to your furthest fixture and how many elbows and 45s you have. Then the distances to everything branching off, again with the number of fittings in each branch. If you can't Tell the number of fittings then you estimate it as 1.5x the distance.

Taking a guess here. Your meter is probably right outside the boiler room. You will need to bring at least 1", probably 1-1/4" into your house from the meter, Tee off that 1-1/4" to feed the boiler and water heater then continue on in 3/4 to the stove and dryer Can't say anything for sure without all the information though. Are you from Long Island, NY? If so what type of pipe are you using? Most if not all of Long Island requires black steel pipe for gas inside. I know you can buy csst but it's not code.

Here is the sizing table. http://www.engineeringtoolbox.com/natural-gas-pipe-sizing-d_826.html

 

[patrickpresti]

To properly size it we need the btu rating of your boiler, water heater, dryer and stove. The dryer and stove I could get close guessing, the boiler and water heater are the variable. We also need to know the distance to your furthest fixture and how many elbows and 45s you have. Then the distances to everything branching off, again with the number of fittings in each branch. If you can't Tell the number of fittings then you estimate it as 1.5x the distance.

Taking a guess here. Your meter is probably right outside the boiler room. You will need to bring at least 1", probably 1-1/4" into your house from the meter, Tee off that 1-1/4" to feed the boiler and water heater then continue on in 3/4 to the stove and dryer Can't say anything for sure without all the information though. Are you from Long Island, NY? If so what type of pipe are you using? Most if not all of Long Island requires black steel pipe for gas inside. I know you can buy csst but it's not code.

Here is the sizing table. http://www.engineeringtoolbox.com/natural-gas-pipe-sizing-d_826.html

Thanks for the reply. My farthest appliance is the stove which is about 55' from the meter.

The boiler is 150,000 btu which is about 10 feet from the meter.

The hot water heater is 62 gallon. I couldn't find a BTU rating on it.

The meter is piped with 3/4" pipe before the meter....

I am on Long Island and I will be using black pipe.

Thanks,

Pat

 

[patrickpresti]

Hi guys,

I am in the beginning stages of calculating the black pipe size for the appliances in my house. How do I find out the inlet pressure, pressure drop, and specific gravity of natural gas? My gas supplier is National Grid on Long Island.

Thanks,

Pat

 

[IslandGuy]

Thanks for the reply. My farthest appliance is the stove which is about 55' from the meter.

The boiler is 150,000 btu which is about 10 feet from the meter.

The hot water heater is 62 gallon. I couldn't find a BTU rating on it.

The meter is piped with 3/4" pipe before the meter....

I am on Long Island and I will be using black pipe.

Thanks,

Pat

The pipe before the meter is high pressure and enters a regulator before the meter. FWIW I have 1" after the meter feeding 2 ranges, a clothes dryer, a gas boiler and an outdoor BBQ.

Just an FYI Pat, nowhere on Long Island is it legal for anyone except a licensed plumber to install gas lines.

 

[patrickpresti]

The pipe before the meter is high pressure and enters a regulator before the meter. FWIW I have 1" after the meter feeding 2 ranges, a clothes dryer, a gas boiler and an outdoor BBQ.

Just an FYI Pat, nowhere on Long Island is it legal for anyone except a licensed plumber to install gas lines.

Thanks for the reply. Good to know with the high pressure before the meter. What I plan on doing running all of the gas branches without making the system live. Then I will have my plumber pull the permit and do the final hookup.

 

[jimn]

Thanks for the reply. Good to know with the high pressure before the meter. What I plan on doing running all of the gas branches without making the system live. Then I will have my plumber pull the permit and do the final hookup.

Hopefully you have a friendly plumber. In these parts no way will plumbers certify a system they didn't install. You need a permit for all the branch lines as well not just the final hook up. Think of it, their name is in the permit and they are certifying the entire job is up to code and done properly. Same with electrician in my area. Once they touch it they own it .

 

[patrickpresti]

Hopefully you have a friendly plumber. In these parts no way will plumbers certify a system they didn't install. You need a permit for all the branch lines as well not just the final hook up. Think of it, their name is in the permit and they are certifying the entire job is up to code and done properly. Same with electrician in my area. Once they touch it they own it .

Thanks for the info. My plumber said as long as the walls are still opened up, he's okay with working with me...