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Discuss Flow + Pressure Test in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Stants

    Stants New Member

    Hi
    Just done a Flow and pressure test
    Flow 3,3 L in 10 secs =19.8
    ( did it 3 times pretty consistent)
    Pressure 4 Bar
    This however was at kitchen sink downstairs but looking to install Unvented Cylinder ( santon or Mega or similar) in loft ( servicing 1 bathroom + 1 onsuite ) will/ is this going to decrease by much going up approx 5.3 mtrs ( 2 storeys ) I think the pressures ok but the Flow may be on the cusp ?? Any thoughts
    Thanks
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Aslong as the mains is done in 22mm from the stop tap you will be fine
     
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  3. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    You loose 0.1 bar per meter so you would still be ok pressure wise . Sorry not totaly sure how you have done your flow test .
     
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  4. Stants

    Stants New Member

    The flow I filled a bucket for 10 seconds
    The amount was 3.3 Ltrs so 3.3 x 6=19.8 in 1 minute I think that's how it's calculated or is that a bit Heath Robinson lol
     
  5. Stants

    Stants New Member

    Are you saying mains from Street stopcock or house stopcock
     
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    house
     
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  7. Stants

    Stants New Member

     
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    best way to, else the drop might be too much
     
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  9. Stants

    Stants New Member

    Do you think the flow will be enough ?
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    if you run it from the mains in 22mm yes and use as many formed bends as possible
     
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  11. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Never seen it done that way but yes I see how its done .
    Sorry I have to ask , are you installing this cylinder
     
  12. Stants

    Stants New Member

    No no no just finding out what can / can't / needs to done
     
  13. Stants

    Stants New Member

    Is there another / more accurate way to test the flow
     
  14. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    I can understand you doing some groundwork pal , but please make sure somebody is G 3 qualified to install it if you go ahead
     
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  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    other than a flow cup no
     
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  16. Stants

    Stants New Member

    That's a good point silly question but what do I ask for proof of this . what do they hold as proof ...is it a BPEC certificate ?
     
  17. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yes or if there has safe should have it on there card
     
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  18. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Different bodies do the qualification ( 2 at least lol )
    They must be 3 G thats all you need to ask
     
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  19. Stants

    Stants New Member

    ah ok I see avoid elbows yeah that makes so much sense I'll try and get it to go up as direct as I can it's all In the planning lol cheers
     
  20. Ric2013

    Ric2013 Plumber Top Contributor!!

    Hang on. I'm not G3, but I would suspect that 4 Bar is his static pressure. Won't his installer need to know what the operating pressure is, at a given flow rate?
     
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  21. Stants

    Stants New Member

    Do you think that could be a problem then?
     
  22. Ric2013

    Ric2013 Plumber Top Contributor!!

    Not necessarily, I expect a poor flow would be the result of a bad working pressure. Just that a pressure test carried out at a given flow might have given an idea whether your mains is capable of giving more than the ?19l flow you had via that tap (could be the tap itself is the restiction), or if that's the maximum of your supply.
    But, as others have said, someone with an unvented qualification (not me) will know the proper tests to perform.
     
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  23. Best

    Best Trusted Plumber Top Contributor!!

    Most taps restrict the flow massively, - particularily modern taps, so I only use them as a rough guide. If flow and pressure is very acceptable from an outside tap, then I know flow will be excellent from an open pipe.
     
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    Last edited: Sep 7, 2017
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