What Size Gas Line For Generator Is Appropriate For You?

We know installing a new generator can be difficult. And if it does not exhaust you, a long list of pipe specifications will surely leave you wondering for an easy way. Speaking of it, we are here to deduce what size gas line for generator you should use for your system and why you should use those exact pipings.

This mainly depends on the motor power and the length of the pipeline.

What Size Gas Line For Generator Is Appropriate

Gas lines are vital for natural gas and LP vapor transport, whichever your generator runs on. A close-packed gas line also enhances generator performance and reduces energy loss. A certified plumber will fit your gas lines for most states and provinces. Yet, it will be much convenient if you have prior knowledge about them. So, let’s begin.

What Size Gas Line For Generator

A gas line size depends on a few different factors. They are:

  • Engine Power.
  • Code requirements
  • Length of the maximum run of the pipe
  • Any specific manufacturer requirements.

Engine Power

The more your engine power is, the larger your pipe size has to be. For example, generators of less than 5 kW power can use .5 to .75 inches pipe. Plus, mightier engines (10kW<) need pipe sizes between .75 to 1.5 inches, depending on how long you want to run the gas line from your gas inlet or source.

Length Of The Maximum Run Of The Pipe

You have to consider choosing a larger pipe size if the total pipe length from your generator to the gas source is long. So, a longer maximum pipe run also needs a larger pipe size.

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For example, a 10 kW engine can run up to 800 feet with a 1.5 inches pipe, 370 feet with a 1.25 inches pipe, 85 feet with a 1-inch pipe, and 20 feet with .75 inch pipe.

And, you can stretch a gas line for a 20kW engine upto 265 feet with a 1.5 inches pipe, 115 feet with 1.25 inches gas line, and 20 feet with a 1-inch pipe.

So yes, pipeline sizing is primarily dependent on engine power and maximum run length. For each engine, you may find multiple options for the sizes of your gas line. But, let the plumber decide it instead. But make sure the pipe size is suitable for your engine inlet engine power and the total length of the line.

Code Requirements

Your gas line falls under the plumbing code of your state or province. This code mentions the lowest minimum figures of what size gas pipe for generator and other appliances we have to use. However, the pipe size your generator requires you to install exceeds that minimum requirement by code.

So, It is essential to follow the plumbing code requirements for your gas line of your province or state to avert any tolls during an inspection. Crosscheck your optimized size according to the generator gas pipe sizing chart with your regional codes for maximum security and reliability.

Any Specific Manufacturer Requirements

The user manual of your generator can also mention a particular size of the gas line. Your gas line also has to be adjustable to the fuel supply inlet of the generator, which is commonly ½ NPT. That includes the pressure requirement at the inlet too.

Likewise, if the water gauge drops below 5 inches for natural gas or 7 inches for LP, then you will have to consult the plumber and increase the pipe size. So, check and verify the pressure using inches of water gauge.

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Frequently Asked Questions (FAQs)

How do I know what size gas line I need?

Firstly, you need to know your generator’s power count (in kW) and then the total length of pipe you need to install. So a generator with a more powerful engine requires a larger pipe size and vice versa. Moreover, you also need to follow or surpass the minimum code requirements.

What size propane line do I need for a 22kw generator?

A 22 kW generator feeding on propane needs a 1-inch line for less than 15 feet connection and 1.25 inches pipe for connections up to 100 feet. For a lengthier connection, you can use 1.5 inches pipe. In this case, you can crosscheck your gas line length with a generator gas pipe sizing chart to fix your pipe size.

What size fuel line for generator?

To know your generator’s fuel line, first, you have to know your generator power (in kW) and then the total length of pipe you need to install. For instance, a generator with a powerful engine requires a larger pipe size and vice versa. Moreover, you also need to follow your province or state’s minimum plumbing code requirements.

What size gas line for Generac generator?

Check your Generac generator’s power output (in kW) to specify the pipe size options you have for that power. Then opt for the one that you can also implement with ease according to the maximum length of the gas line.

What size gas line for 22kw generator?

For natural gas, a 22 kW generator performs best with a 1-inch gas line for lengths upto 20 feet and 1.25 inches line for upto 130 feet. For longer lines, use 1.5 inches gas line.
And, for propane-fed 22 kW generator, a 1-inch line for less than 15 feet connection and 1.25 inches pipe for connections up to 100 feet will be appropriate. For a lengthier connection, you can use 1.5 inches pipe.

What size gas line for 20kw generator?

If the generator runs on natural gas you can use a 1” pipe for upto 20 feet, a 1.25” line for upto 115 feet, and 1.5” upto 265 total pipe length. For LP, you can use a .75” pipe for upto 15 ft., 1” pipe for upto 80 feet, and a 1.25” line for upto 115 feet. So this depends on whether you use natural gas or LP vapor and the required maximum gas line length.

What size gas line for backup generator?

Your backup generator power out determines the size of your gas line. Along with it, the total length of your gas line from the generator to the gas source is also a great factor for deciding the best size for your gas line. So, specify the engine power of the generator and crosscheck with a sizing chart.

What size gas line for portable generator?

The engine power of your portable generator engine determines the size of your gas line. Additionally, the length of your gas line from the generator to the gas source is also an essential element for deciding the best size for your gas line. So, specify the engine power of the generator and crosscheck with a sizing chart.

Final Thoughts

We hope we could quench your thirst for curiosity surrounding generator line sizes. We also expect this guide to clarify what size gas line for generator is suitable for your system aids you today and in the future. With it, we wrap up our show here. Stay healthy and safe until we appear with another guide. Goodbye!

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