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  2. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    For example, DN20 is the size for copper pipe with an outside diameter of 19.05 mm or 3 ⁄ 4 inch. While pipe sizes in Australia are inch-based, they are classified by outside rather than inside diameter (e.g., a nominal 3 ⁄ 4 inch copper pipe in Australia has measured diameters of 0.750 inches outside and 0.638 inches inside, whereas a ...

  3. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    All DWV systems require various sized fittings and pipes which are measured by their internal diameter of both the pipes and the fittings which, and in most cases are Schedule 40 PVC wye's, tee's, elbows ranging from 90 degrees to 22.5 degrees for both inside diameter fitment (street) as well as outer diameter fitment (hub), repair and slip ...

  4. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Flexible rubber sleeves are used to connect this cast-iron and copper DWV installation. Cast iron DWV pipe and fittings are still used in premium construction because they muffle the sound of wastewater rushing through them, [21]: 149 but today they are rarely joined with traditional lead joints.

  5. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  6. Central vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Central_vacuum_cleaner

    The routing and design of the vacuum piping layout are very similar to drain-waste-vent (DWV) plumbing, with the exception that pipe pitch or gradient for drainage is not required. Vacuum system designs share with DWV designs a concern about eliminating internal roughness, ridges, burrs, sharp turns, pockets, or other obstructions to smooth ...

  7. Pipe (fluid conveyance) - Wikipedia

    en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

    Pipe sizes can be confusing because the terminology may relate to historical dimensions. For example, a half-inch iron pipe does not have any dimension that is a half inch. Initially, a half inch pipe did have an inner diameter of 1 ⁄ 2 inch (13 mm)—but it also had thick walls. As technology improved, thinner walls became possible, but the ...