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quick gas capacity question

Discussion in 'Plumbing and Central Heating' started by johno12345, 25 Jun 2020.

  1. johno12345

    johno12345

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    Hi,

    im not doing any work here, just looking at feasibility. How many kW can I get from a 1" tapping at 70mbar for natural gas. The supply is more than big enough, and again at 3/4"

    or can anyone point me to how to work it out


    Thanks
     
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  3. ianmcd

    ianmcd

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    How are you going to get a Nat Gas Supply at 70 Mbar ?
     
  4. johno12345

    johno12345

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    I already have the 70 mbar natural gas supply
     
  5. Madrab

    Madrab

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    You shouldn't be contemplating/calculating anything that's upstream of the governor on the mainstream side of the domestic natural gas supply. Dangerous stuff that.
     
  6. johno12345

    johno12345

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    its not up stream of the governor, that's the MP main, we have our own governors for each appliance whether its off the 70mbar system, or the 35mbar system
     
  7. ianmcd

    ianmcd

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    No you dont , you have a Low pressure gas supply, which can be up to 75 Mbar, but will be reduced at the meter to around 20mbar maybe as low as 19Mbar you do not have a MP supply
     
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  8. johno12345

    johno12345

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    I can assure you that i do have a 70 and 35 mbar main in the building, since i use about 23MW of gas at peak.

    I wouldnt have a governor on every appliance otherwise.

    Anyway, i just wanted to know if i could get 60kW out of an existing 1"tapping at 70 mbar for a small water heater
     
  9. ianmcd

    ianmcd

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    you dont,you cant possibly, argue all you want but you do not have a 70Mbar outlet legally
     
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  11. johno12345

    johno12345

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    Im not arguing, because i know what i have. Imagine the size of pipe id need for 1 megawatt at 20mbar
     
  12. ianmcd

    ianmcd

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    No what you dont realise is that you can not have a 70Mbar outlet on a domestic meter, read it again you can not have it , never , nada, not going to happen ever
     
  13. johno12345

    johno12345

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    Its not a domestic meter, obviously. I never mentioned a meter at all. Just pipe sizing

    I dont know would have been an ok answer
     
  14. Gasguru

    Gasguru

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    This is a diy forum and you're asking industrial gas questions...those on the forum that would know don't frequent the Plumbing section.
    Why don't you ask the site contractors?
     
  15. johno12345

    johno12345

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    I asked because i thought someone might be able to point me to a calculator thats all. Its only one variable thats different to domestic gas

    No site contractors. Yet, its just a feasibility thing im working on
     
  16. ianmcd

    ianmcd

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    well it is simple , no you cant, you can not work on that supply under any circumstances
     
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  17. bernardgreen

    bernardgreen

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    Hope not. 70 Mbar is ‪‬ ‪1,015,264,207‬ pounds per square inch
     
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