How to do a cold water system check on a domestic mains fed system?

Im doing my C&G 6129 in plumbing, this question comes up on my scenario, i have tried everything i can think of…any help would be great.

Thanks x

6 Answers

  • Anonymous
    1 month ago

    I presume that you are wanting to check the cold water only. By that the the incoming supply and pressure.

    Connect a water pressure gauge to the cold supply, this is usually done by disconnecting the cold washing machine or dishwater supply under the sink and connecting the gauge onto the washing machine valve. Turn on the sink cold tap and read the gauge, it must be at least one and a half bar and preferably at least three bar. Place a weir overflow cup under the running cold tap, and read the water level at its weir you need at least 20litres/minute, preferably more than 25litres/min,

  • letsget_dangerous
    1 month ago

    are you talking about a new system?

    if so close system and add a pressure guage to system water lines should be able to hold 100psi for 12 hours.

  • Plumber techie
    1 month ago

    What situation you talking about testing? a new or existing instalation?

  • Anonymous
    1 month ago

    Hi, The answers are in your course books, Read them “LAZY” or you will not learn. Hope this helps:):):)

  • Laura
    6 days ago

    im currently doing the same course and have came across same problem, i successfully flooded the house.

  • philip
    6 days ago


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