DIY Heating Plumbing Tips 2 - Plastic Plumbing Design And Installation Guide


DIY heating plumbing tips 2 answers the following FAQ's on residential plastic plumbing pipes.

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DIY Heating Plumbing Tips 2

What Are The Pipe Sizes?


How Do I Connect Plastic Pipes?


Plastic compression joint

  • Compression joints
    • A compression joint is a threaded joint designed for easy dismantling, and is used to connect the 'Traps' (the water seal fitting) of baths, sinks, basins, and showers to the pipework. The integral rubber ring or washer makes this joint water tight

    (the image above shows a plastic compression joint)


    Plastic pushfit waste pipe

  • Push-fit joints for waste systems
    • Because your waste system is never under pressure the pipe runs can be connected together with push-fit joints simply by pushing the plain pipe into the joint socket and the captive ring (an O-ring) inside the joint both holds the pipe in place and makes the joint water tight, e.g, the WC waste pipe connector (the connectors that connects to your toilet's waste pipe uses a similar method)

    (the image above shows a plastic waste pipe push-fit joint)


    Plastic push-fit for supply connection

  • Push-fit joints for supply systems
    • With push-fit joints for supply systems, when the pipe is inserted an integral O-ring will seal the water. The grab ring or collet with stainless steel teeth (depending on the manufacturer) grips the tube and prevents the joint from coming apart under mains water pressure
    • (the image above shows a plastic tee push-fit joint)

    • Pushfit joints are more obtrusive than a solvent-weld joint but they are quicker and simple to install

    Plastic fitting being manually pressed
    Plastic press-fit fitting
    Pressed fitted plastic joint

  • Press Fit Joints
    • Press fit joints incorporate an outer metal sleeve. The body of the actual fitting can be either plastic or metal with integral inserts.

      Depending on the type they are pressed together either manually or using a power tool


    (the images above show a manually pressed plastic pipe press-fit joint)

    Top DIY Heating Plumbing Tips 2


    Can I Get All The Plumbing Joints And Fittings in Plastic?

    Top DIY Heating Plumbing Tips 2

    Are There Different Types of Plastic Pipes?

    Top DIY Heating Plumbing Tips 2


    Are Plastic Pipes Easier To Install Than Copper Tubing?

    Can I Connect Plastic Pipes To Copper Tubing?

    How Can I Cut Plastic Pipe So It's Square?

    What Is The Spacing Distance between the Pipe Support Clips?

    Pipe size
    Copper-
    -tube
    Steel-
    -pipe
    Plastic-
    -pipe
    mm------------in
    horizontal
    vertical
    horizontal
    vertical
    horizontal
    vertical
    15 - 16: ---- 0.5
    1.2
    1.8
    1.8
    2.4
    0.6
    1.2
    20 - 22: -- 0.75
    1.8
    2.4
    2.4
    3.0
    0.7
    1.4
    25 - 28: ------ 1
    1.8
    2.4
    2.4
    3.0
    0.8
    1.5
    32: --------- 1.25
    2.4
    3.0
    2.7
    3.0
    0.8
    1.7
    40 - 42: ---- 1.5
    2.4
    3.0
    3.0
    3.6
    0.9
    1.8
    50: ------------ 2
    2.7
    3.0
    3.0
    3.6
    1.0
    2.1

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