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Gas Piping Size For Fire Pits

Gas Piping Size For Fire Pits

One of the most common questions we are asked is 'what size gas pipe should I use to feed my gas fire pit'.

Large Size Gas Pipes

This is quite a complex issue so we have tried to simplify it for you here, but please bear in mind this is for guidance purposes only.

The sizing charts provided here are for a new gas line installations directly from the gas source. If you are connecting to an existing gas line you must take into consideration the existing gas line capacities to ensure you will have proper pressure at your fire pit.

These charts are for reference only, we strongly recommend you consult with a Licensed Plumber/Gas Fitter or the NFPA54 ( National F Gas Code - current edition ) for more details.

How to use the Charts?

Using the Natural Gas Chart as an example.

Let's assume you are planning to install a 75,000 BTU gas burner in your fire pit project. The column on the left represents the length of the required gas pipe to reach from your gas source to the fire pit structure. ( Add 5 feet to that length for every 90-degree bend in the pipe length.) The row across the top represents the possible gas pipe diameters i.e. 1/2 ", 3/4" etc.

Starting in the left column, select the overall length of gas pipe required. ( if you figure falls between two of the options always go the longer distance ). Let's say we need 110 feet of gas pipe, we would select the 125 feet figure. 

Now we look to the right along the line of figures that will provide our 75,000 BTU unit with enough gas. The first figure we find is 28, that is 28,000 BTU so that is not enough for our 75,000 BTU unit. The next figure to the right is 60, that represents 60,000 BTU which is still not enough for our 75,000 BTU unit, so continuing moving to the right the next figure is 117 equalling 117,000 BTU which is more than enough for our 75,000 BTU requirement. Now look up to the top row of the chart above the 117 figure and that shows that you will need a 1" diameter gas pipe.

The calculations are different for Natural Gas and Propane so there are two separate charts.

Natural Gas Pipe Size Chart.

Table to select required Nat. Gas pipe size

Liquid propane Pipe Size Chart

Table to select required Propane pipe size

How Long will my propane tank last?

Another common question we are asked is 'how long will my 20 lb Propane tank will last before running out of gas'

The following chart will show you how to work that out. All you need to know is what the BTU rating of the appliance is. 

Chart Showing How Long A Propane Gas Tank Will Last

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