Gas Line Size

[Plumber69]

Looked at a job today, there is a 35' long gas line, 1 inch. This will supply 200,000 btu on demand, two 75,000 btu furnaces, 16,000 btu dryer, 35,000 btu range. Im thinking 1" is too small

 

[wwhitney]

Looked at a job today, there is a 35' long gas line, 1 inch. This will supply 200,000 btu on demand, two 75,000 btu furnaces, 16,000 btu dryer, 35,000 btu range. Im thinking 1" is too small

If it's a 1/4 psi system (7" w.c.) with 0.5" w.c. allowable pressure drop, and 1" iron pipe, then you are right. Per the 2015 IFGC Table 402.4(2), allowable flow on a 35' 1" iron pipe is about 350 kBTUs/hr.

https://up.codes/viewer/washington/ifgc-2015/chapter/4/gas-piping-installations#402

Cheers, Wayne

 

[Sponsor]

 

[Plumber69]

If it's a 1/4 psi system (7" w.c.) with 0.5" w.c. allowable pressure drop, and 1" iron pipe, then you are right. Per the 2015 IFGC Table 402.4(2), allowable flow on a 35' 1" iron pipe is about 350 kBTUs/hr.

https://up.codes/viewer/washington/ifgc-2015/chapter/4/gas-piping-installations#402

Cheers, Wayne

Think being short 50,000 would be a big deal

 

[wwhitney]

Think being short 50,000 would be a big deal

I don't really know--but from the tables I infer that the allowable length is 28', so you'd be 25% over length, before any allowance for the additional segments from the end of the 1" pipe to each appliance. Is it feasible to run a separate 1" line from the meter to the tankless water heater?

Cheers, Wayne

 

[Plumber69]

Well the range is another 25' beyond the furnaces,dryer and on demand. I think if both furnaces and demand were running. The range wouldn't even work