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Started By
Message
Gas Line for 22kw Generac - Certain Length of Straight Run Required?
Posted on 2/27/26 at 9:44 am
Posted on 2/27/26 at 9:44 am
In the processing of installing a 22kw Generac.
Plumber mentioned needing a certain feet (he might have said 8 ft) of a straight run of pipe for the gas, which would be run from the meter to the generator.
I’m just checking that I’m understanding that requirement correctly and if anyone can confirm this requirement. I plan on putting the generator right next to the meter, so the gas pipe would only need to about a foot long if I could run it directly to the generator without this straight run first.
Thanks
Plumber mentioned needing a certain feet (he might have said 8 ft) of a straight run of pipe for the gas, which would be run from the meter to the generator.
I’m just checking that I’m understanding that requirement correctly and if anyone can confirm this requirement. I plan on putting the generator right next to the meter, so the gas pipe would only need to about a foot long if I could run it directly to the generator without this straight run first.
Thanks
This post was edited on 2/27/26 at 9:46 am
7
Posted on 2/27/26 at 9:49 am to Seven Costanza
not sure exactly what that means. i can confirm that mine is flex piped in from pipes underground that snake down from my attic, so lots of 90's.
i don't see anything from generac regarding a "straight run"
i don't see anything from generac regarding a "straight run"
Posted on 2/27/26 at 9:55 am to Seven Costanza
That doesnt make any sense.
All that matters is that there is sufficient gas pressure at the engine inlet at full load. The overall pipe losses determine that, and I imagine Generac has some simplified guidance on line sizes and routing. With such a short run, a flex hose of one size larger than the engine inlets fitting size will probably be more than fine.
All that matters is that there is sufficient gas pressure at the engine inlet at full load. The overall pipe losses determine that, and I imagine Generac has some simplified guidance on line sizes and routing. With such a short run, a flex hose of one size larger than the engine inlets fitting size will probably be more than fine.
Posted on 2/27/26 at 10:26 am to DownshiftAndFloorIt
quote:
a flex hose of one size larger than the engine inlets fitting size will probably be more than fine.
And with the generator secured adjacent to the meter, I could run this flex hose straight from the meter to the generator, correct?
Posted on 2/27/26 at 10:26 am to Randall Savauge
quote:
i don't see anything from generac regarding a "straight run"
Ok this is good to know. I was confused as well.
Posted on 2/27/26 at 11:19 am to Seven Costanza
performace wise it won't matter. There might be a requirement to have 8ft distance from meter to generator.
Posted on 2/27/26 at 3:07 pm to Turnblad85
quote:
might be a requirement to have 8ft distance from meter to generator
That would make more sense
Posted on 2/27/26 at 9:31 pm to DownshiftAndFloorIt
Saw this online:
3-Foot Rule: NFPA 54 National Fuel Gas Code stipulates that gas meters must be located at least 3 feet from sources of ignition, such as generators, electric meters, or air conditioners.
3-Foot Rule: NFPA 54 National Fuel Gas Code stipulates that gas meters must be located at least 3 feet from sources of ignition, such as generators, electric meters, or air conditioners.
Posted on 2/27/26 at 10:42 pm to Seven Costanza
My generator is not 8 ft from the meter maybe 3-4 feet at the most. I had a site plan drawn up and submitted to the parish for approval and they didn’t give me any trouble. I ran pipe from the meter along my walk and flexed it to the generator. Permit was approved and inspected by the parish without problems. Haven’t had any performance issues either. Ran through the ice storm 2 years ago without problems.
I had transfer switch installed when building and the meter was installed next to power when we built because I knew I would eventually install a generator. I ran gas myself and had a guy that installed generators hook up the wires once we were ready to install the whole unit. All permitted and inspected. Hope that helps. I guess it all depends on where you live for requirements.
I had transfer switch installed when building and the meter was installed next to power when we built because I knew I would eventually install a generator. I ran gas myself and had a guy that installed generators hook up the wires once we were ready to install the whole unit. All permitted and inspected. Hope that helps. I guess it all depends on where you live for requirements.
Posted on 2/28/26 at 7:06 am to Seven Costanza
When I installed mine the requirements were to be 5 ft from the meter, 5 ft from the house and 5 ft from any window. This is East baton Rouge Parish rules. I would definitely make sure that it's pushed out far enough that the exhaust is not able to go up into your soffit vents.
You will also have to put carbon monoxide detectors in each bedroom of the home when you have a standby generator per code. Not a biggie but something keep in mind.
You will also have to put carbon monoxide detectors in each bedroom of the home when you have a standby generator per code. Not a biggie but something keep in mind.
Posted on 3/2/26 at 9:21 am to Seven Costanza
I have less than 8 feet from meter to generator. No issues.
Posted on 3/2/26 at 9:58 am to Seven Costanza
Plumber is correct in what he said, but it is almost never necessary for residential generators. For the large hospital or shopping center generators, they need 8-10 feet of pipe (normally 2x actual pipe size) for the start-up. The demand when those behemoths fire up is staggering and they can suck the line empty, choke out and will not run without having this "tank" of gas to fire-up. I've never seen/heard of a residential sized generator that needed the oversized pipe for start-up.
Posted on 3/2/26 at 10:09 am to MrBobDobalina
quote:
Plumber is correct in what he said, but it is almost never necessary for residential generators. For the large hospital or shopping center generators, they need 8-10 feet of pipe (normally 2x actual pipe size) for the start-up. The demand when those behemoths fire up is staggering and they can suck the line empty, choke out and will not run without having this "tank" of gas to fire-up.
Ah, very interesting. I could see how this would be needed for larger generators. Thanks for the additional information.
Posted on 3/2/26 at 5:13 pm to Seven Costanza
you need volume for start-up. thats why they reccomend 8 ft ,usually upsized like a volume tank. i would also ask for the upsized gas meter with more volume. every bit helps.
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