Fire Pit Planning – Make Sure You Have The Correct Gas Line Size For Your Burner!

This is such an important part of making sure your fire pit works perfectly! It’s the number one mistake I see people make when putting together their own pit. Watch the video, read the charts and make sure your Fire Pit works great!

(PLEASE NOTE: You must consult with a local professional when determining your gas line size and length as we cannot answer specific questions about your gas line.)

EXTREMELY Important Gas Line Sizing Information

The biggest mistake that I see people make is not getting the right BTU burner for the length of hose they run. The charts below will help you figure out the burner size needed for your project.

  • LP Example: A machine with a burner that requires 440,000 BTU would need a 1″ for a 20′ long run.
  • LP Gas Flow is given in thousands of BTU/hr. – One Cubic foot of LP gas – 2516 BTU
  • This chart refers to low-pressure LP, after regulation. The standard nominal pressure at the burner for liquid propane gas is 11″ of the water column.
  • Pipe length must include an additional length for all fittings. Add approximately 5 feet of pipe per fitting.
Liquid Propane Gas Pipe Size Chart For Outdoor Gas Fire Pits

How To Read This Chart:

  • Use the left column to find the distance of your fire feature to the fuel source (distance in feet)
  • Use the top row to find the size of your gas pipe (1/2″ – 1-1/2″)
  • Chart is based on 7″ w.c. which is normal gas residential gas pressure (verify with local professional)
  • Find the approximate number of BTU’s available (in thousands)
  • Normal residential gas pressure is between approximately 3.5″ – 7″ water column or about .125 – .25 psi 2 psi gas pressure is very high, and will need to be regulated down accordingly.
  • Water column is a measurement used if the psi is too low to measure
natural gas line sizing chart

Disclaimers & Recommendations

  • CONSULT WITH A LOCAL GAS PROFESSIONAL TO DETERMINE ACCURATE BTU AVAILABILITY
  • Use this chart as a guideline ONLY and does NOT account for variations in the type of pipe (plastic or iron)
  • Chart does NOT account for other appliances, meter pressure, or 90’s
  • Contact a gas professional to verify your gas pressure
  • Montana Fire Pits is not a licensed gas professional and is NOT able to calculate accurate BTU availability
  • Numbers are in thousands of BTU’s Chart is based on “normal” household natural gas pressure is approximately 7″ water column (please verify)
  • Example: A fire pit burner requiring 250,000 BTU’s would need a 3/4″ pipe for a 30′ long run

What’s Next?

Now that you have an idea of what size burner you need for your project, take a look around at our options. If you’re still needing some direction, be sure to check out our DIY fire pit info below.