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  2. North American Fire Hose Coupler Incompatibilities - Wikipedia

    en.wikipedia.org/wiki/North_American_Fire_Hose...

    At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 12-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Most threaded-pipe systems require strategically located pipe-union fittings in final assembly. The threaded pipe is heavy and requires adequate attachment to support its weight. To ensure a comprehensive pressure test, it is crucial to explicitly request a 3.1 certificate in accordance with EN HFF 10204:2004.

  4. Drill string - Wikipedia

    en.wikipedia.org/wiki/Drill_string

    Drill pipe makes up the majority of the drill string back up to the surface. Each drill pipe comprises a long tubular section with a specified outside diameter (e.g. 3 1/2 inch, 4 inch, 5 inch, 5 1/2 inch, 5 7/8 inch, 6 5/8 inch). At each end of the drill pipe, tubular larger-diameter portions called the tool joints are located. One end of the ...

  5. Hose coupling - Wikipedia

    en.wikipedia.org/wiki/Hose_coupling

    Norway uses NOR fittings for attack hoses. They come in three sizes: NOR 1 (83 or 84 mm; 2 + 12-inch), NOR 2 (65 or 66 mm; 2"), and NOR 3 (50 or 55 mm; 1 + 12-inch). NOR 2 is mostly used in the maritime and offshore oil industry.

  6. Driving cap - Wikipedia

    en.wikipedia.org/wiki/Driving_cap

    A driving cap is a special type of pipe cap used to provide a striking surface for a hammer while simultaneously protecting the end of the pipe from deformation. [1] A driving cap is made of much thicker or more durable material than a standard pipe cap and is always removed once installation is complete.

  7. Coupling (piping) - Wikipedia

    en.wikipedia.org/wiki/Coupling_(piping)

    Alternatively it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is double male) or two male or female British standard pipe threads. If the two ends of a coupling are of different standards or joining methods, the coupling is called an adapter. Examples ...

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