Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

gas pipe sizing

zepfan Member Posts: 365
as a rule of thumb what diversity factor should be used when sizing a 2 psi gas pipe system? say for example you have (5) 130,000 btu input gas fired rooftop units,with a design day in the winter of 12 degrees.it is highly unlikely that all of these units would be firing at the same time.is there a diversity factor that should be used when sizing the pipe?any feedback would be much appreciated.thank you


  • Henry
    Henry Member Posts: 996
    Gas piping

    By code, one should always size for the maximum BTU input of all appliances regardless if they only work part time or in the off season.
  • Tim McElwain
    Tim McElwain Member Posts: 4,580
    In other words with

    your application there is no diversity factor. Diversity factor would be having a pool heater for use in the summer time and a boiler for use in the winter.

    There actually is the possibilty at some time they all would be firing.
This discussion has been closed.