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    Hi guys.

    I have some questions in plumbing and I need help.

    1*)when installing a combined building drain, which load in litters does 275 FU represent?

    2*)what the hydraulic load from a pump for a continuous flow discharging to a strong sewer at 1.5 L/x?

    3*)what is the maximum number of litters allowed on a 12 ", building drain at 0.75% grade?

    4*)what is the minimum air gap required for 1/4 "water supply outlet?
    which one item is essential to all hot water heaters?

    5*)which one item is essential to all hot water heaters?

    Thanks for the help

  • #2
    Re: help

    5*) water

    Comment


    • #3
      Re: help

      What is the purpose of these questions?

      Comment


      • #4
        Re: help

        Originally posted by lizaclaude View Post
        Hi guys.

        I have some questions in plumbing and I need help.



        4*)what is the minimum air gap required for 1/4 "water supply outlet?


        Thanks for the help
        An air gap shall provide the best level of protection in all backflow situations. The minimum required air gap shall be determined as follows:
        1. How measured. The minimum required air gap shall be measured vertically from the lowest end of a potable water outlet to the flood rim or line of the fixture or receptacle into which it discharges.
        2. Size. The minimum required air gap shall be:
        a. Twice the effective opening of a potable water outlet; or
        b. If the outlet is a distance less than three (3) times the effective opening away from a wall or similar vertical surface, three (3) times the effective opening of the outlet.
        3. The minimum required air gap shall not be less than shown in the following table - Minimum Air Gaps for Plumbing Fixtures.
        MINIMUM AIR GAPS FOR PLUMBING FIXTURES

        Fixture
        Minimum Air Gap

        When not affected
        by near wall
        (inches)
        When affected
        by near wall
        (inches)
        Lavatories and other fixtures with effective opening not greater than 1/2 inch diameter
        1
        1 1/2

        Sink, laundry trays, gooseneck bath faucets and other fixtures with effective openings not greater than 3/4 inch diameter
        1 1/2
        2 1/4

        Over rim bath fillers and other fixtures with effective openings not greater than 1 inch diameter
        2
        3

        Drinking water fountains - single orifice not greater than 7/16 (0.437) inch diameter or multiple orifices having total area of 0.150 square inches (area of circle 7/16 inch diameter)
        1
        1 1/2

        Effective openings greater than 1 inch
        2 x diameter of effective opening
        3 x diameter of effective opening

        Comment


        • #5
          thanks

          thanks alot for the question 4

          Comment


          • #6
            Re: help

            Hi PhilC,

            for the rest of questions, I have some anwsers but I am confusedwhich one is correct.

            1*)2503L, 2360L, 8717L, 247500L.

            2*)26.4 FU, 47.6 FU, 1350.0L, 2360.0L

            3*)55900L, 68300L, 78700L, 95500L

            5*)Draft control device,
            Draft root device, Check valve on cold water supply, shut off valve on cold water supply.

            Comment


            • #7
              Re: help

              For #3 the minimum pitch is 1%
              Ron Hasil Lic #058-160417
              A-Archer Sewer & Plumbing specializing in:
              Tankless Water Heaters | Drain and Sewer Cleaning
              Sump and Ejector Pumps | Backflow RPZ Testing

              Comment


              • #8
                Re: help

                Originally posted by Chemeng View Post
                What is the purpose of these questions?
                I think it's to figure out how smart the plumbers on this forum are

                Comment


                • #9
                  Re: help

                  How much wood would a woodchuck chuck

                  What's wrong guys, don't feel like spending a half hour doing someone elses math for them?
                  sigpic

                  Comment


                  • #10
                    Re: help

                    NHMaster, You kill me !

                    I've been away for awhile working, I turn this thing on and got a good laugh!

                    You made my day.

                    For all you out of work Plumbers help is on the way.... Obama is focusing on jobs like a laser Beam !

                    Comment


                    • #11
                      Re: help

                      5) every water heater requires a temperature and pressure relief device.

                      Comment

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