Gas Pipe Sizing Calculator

Gas Pipe Sizing Calculator


(3 stars)


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1,000 - 5,000 downloads

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A study carried out by Worcester Bosch Group's technical support team found that the most common cause of a boiler installation problem was from incorrectly sized gas pipes. When fitting a new boiler, often the existing pipes should be replace for larger ones due to the increased output. Smaller pipes will mean the boiler is running at a lower power and can cause an increase in carbon monoxide levels.

The Gas Pipe Sizing Calculator is an extremely easy to use app that will help you to select the right size pipes for installations using copper (up to 108mm), steel (up to 300mm) and PE (up to 315mm) pipes of sections up to 250m (820ft) in length.

To carry out a calculation simply select the gas type, enter the appliance heat input, enter the pipe length, the number of high or low loss fittings (guidance is given in the app), select the type of pipe and then press the 'Calculate' button.

The results will show the total equivalent length, the minimum pipe diameter (metric) that should be used and the pressure drop for that section of pipe.

For multiple appliances each section should be calculated in turn and the kW inputs for the appliances in each section added together for each calculation.

The maximum pressure drop from each appliance to the meter should be no more than 1 mbar for natural gas or 2.5 mbar for butane or propane. Adding all drops together using the minimum pipe diameters may cause this to be exceeded. Where possible, the results will also calculate the drop if the next larger size pipe diameter is selected on a section, this should help to ensure the right sizes are used throughout the whole circuit.

Please note: This app is designed mainly for the UK so supports metric pipe sizes only.

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Recently changed in this version

This is our biggest update yet!

Here's what we've added:

• Support for pipe section lengths up to 250 meters
• Copper pipe up to 108 mm
• Steel up to 300 mm
• Polyethylene up to 315 mm
• Support for Butane and Propane gases
• Improved help files
• Improved interface

And it's all new under the bonnet too.

We hope you like these updates, don't forget to leave us a review.

Comments and ratings for Gas Pipe Sizing Calculator
  • (53 stars)

    by jane goodall on 18/01/2015

    first class

  • (53 stars)

    by Dean Marsden on 06/09/2014

    It's ok but does not tell you the amount of volume in the pipe. Be good to know when your close to limits . . .

  • (53 stars)

    by Mark Manship on 29/05/2014

    Just tried this app once so far, it would be better if the app automatically translated metric to ase all throughout the calculation so I wouldn't have to make the transition myself at the end.

  • (53 stars)

    by Craig Dabbs on 03/10/2013

    Will be handy to have Lpg options.

  • (53 stars)

    by Ian Briggs on 31/05/2013

    It is a good app to help you make decisions about the gas pipe size you need. It works best in domestic properties as it has a maximum length of 30m. So if you use your knowledge and this app together you will be happy. Also, i contacted mr combi training for some app related help and they got back to me very quickly and was very helpful- they sorted out my problem and i'm a happy customer! Cheers