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  2. 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 ...

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    [1] [2] These fittings are used in plumbing to manipulate the conveyance of fluids such as water for potatory, irrigational, sanitary, and refrigerative purposes, gas, petroleum, liquid waste, or any other liquid or gaseous substances required in domestic or commercial environments, within a system of pipes or tubes, connected by various ...

  4. Spacer patterning - Wikipedia

    en.wikipedia.org/wiki/Spacer_patterning

    An approach related derived from self-aligned spacer double patterning is so-called "anti-spacer" double patterning. In this approach a first layer coating the mandrel is eventually removed, while a second coated layer over the first layer is planarized and retained. A purely spin-on and wet-processed approached has been demonstrated. [3]

  5. RCA clean - Wikipedia

    en.wikipedia.org/wiki/RCA_clean

    The first step (called SC-1, where SC stands for Standard Clean) is performed with a solution of (ratios may vary) [2] 5 parts of deionized water; 1 part of ammonia water, (29% by weight of NH 3) 1 part of aqueous H 2 O 2 (hydrogen peroxide, 30%) at 75 or 80 °C [1] typically for 10 minutes. This base-peroxide mixture removes organic residues.

  6. Roto-Rooter - Wikipedia

    en.wikipedia.org/wiki/Roto-Rooter

    Roto-Rooter Plumbing & Water Cleanup (formerly called Roto-Rooter Plumbing & Drain Service) is a plumbing company based in Cincinnati, Ohio.The company, founded in 1935, originally specialized in clearing tree roots and other obstructions from sewer lines.

  7. Street elbow - Wikipedia

    en.wikipedia.org/wiki/Street_elbow

    Street elbows are available with bend angles of 90°, 45°, and 22.5°. They can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe.

  8. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    A duct with less than 0.75 mg/100m 2 is considered to be clean, per the NADCA standard. [7] A Hong Kong standard lists surface deposit limits of 1g/m 2 for supply and return ducts and 6g/m 2 for exhaust ducts, or a maximum deposit thickness of 60 μm in supply and return ducts, and 180 μm for exhaust ducts. [8]

  9. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    Double-walled pipe system may use plastic pressure pipe systems materials of high-density polyethylene (HDPE), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polypropylene (PP), polyvinylidene fluoride (PVDF), and ethylene chlorotrifluoroethylene copolymer (ECTFE).