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  2. Back-up ring - Wikipedia

    en.wikipedia.org/wiki/Back-up_ring

    The back-up ring is matched to the steel pipe flange specification and is placed behind the HDPE flange adapter - an end piece on the HDPE pipe that looks much like a steel flange at the end of the HDPE pipe. As the flange adapter does not have much structural strength, the back-up ring supports and compresses the HDPE flange adapter against ...

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    bell adapters which are like mechanical joint adapters but contain a stainless steel backup ring to maintain a positive seal against the mating flange [9]: 347 flange adapters which attach to a polyethylene pipe with butt fusion to stiffen a junction and allow another flanged pipe or fitting to be bolted on [9]: 341

  4. HDPE pipe - Wikipedia

    en.wikipedia.org/wiki/HDPE_pipe

    HDPE pipe is a type of flexible plastic pipe used to transfer fluids and gases. It is often employed for replacing aging concrete or steel main pipelines . Constructed from the thermoplastic HDPE (high-density polyethylene ), it has low permeability and robust molecular bonding, making it suitable for high-pressure pipelines .

  5. Heat fusion - Wikipedia

    en.wikipedia.org/wiki/Heat_fusion

    Adaptor plates that match the outside diameter of the main pipe are applied to the heating plate to perform this type of fusion. [8] Another method used is referred to as electrofusion. Electrofusion is a method of joining HDPE and other plastic pipes with special fittings that have built-in resistive wire which is used to weld the joint ...

  6. Pipe fitting - Wikipedia

    en.wikipedia.org/wiki/Pipe_fitting

    Pipe fitting may refer to: The work of pipefitters, who install or repair piping or tubing systems; Piping and plumbing fittings, adapters used in pipe systems

  7. Compression fitting - Wikipedia

    en.wikipedia.org/wiki/Compression_fitting

    A compression fitting 15 mm isolating valve. A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. . In instances where two pipes made of dissimilar materials are to be joined (most commonly PVC and copper), the fittings will be made of one or more compatible materials appropriate for the connect

  8. B16 Standardization of Valves, Flanges, Fittings, and Gaskets

    en.wikipedia.org/wiki/B16_Standardization_of...

    The ASME B16 Standardization of Valves Flanges, Fittings and Gaskets Committee, which operates under ASME’s Board on Pressure Technology Codes and Standards is responsible for standards covering valves, flanges, pipe fittings, gaskets and valve actuators for use in pressure services.

  9. High-density polyethylene - Wikipedia

    en.wikipedia.org/wiki/High-density_polyethylene

    HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]

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