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  2. National Board of Boiler and Pressure Vessel Inspectors

    en.wikipedia.org/wiki/National_Board_of_Boiler...

    Pressure-retaining items can be registered with the National Board, requiring certain uniform quality standards be achieved certifying the manufacturing, testing, and inspection process. To obtain a certification the registered items have to be inspected by National Board-commissioned inspectors and built to required standards.

  3. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

  4. Air gap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Air_gap_(plumbing)

    This arrangement prevents any contaminants in the sink from entering into the potable water system by siphonage; this is the simplest form of backflow prevention. A common use of the term "air gap" in domestic plumbing refers to a specialized fixture that provides backflow prevention for an installed dishwasher. This "air gap" is visible above ...

  5. 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.

  6. Plumbing - Wikipedia

    en.wikipedia.org/wiki/Plumbing

    Certification: To achieve certified plumber status in Canada, individuals typically complete an apprenticeship program encompassing both classroom instruction and ...

  7. Hydrostatic test - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_test

    Hydrostatic tests are conducted under the constraints of either the industry's or the customer's specifications, or may be required by law. The vessel is filled with a nearly incompressible liquid – usually water or oil – pressurised to test pressure, and examined for leaks or permanent changes in shape.

  8. Plumber - Wikipedia

    en.wikipedia.org/wiki/Plumber

    Years of training and/or experience are needed to become a skilled plumber; some jurisdictions also require that plumbers be licensed. Common plumbing tasks and skills include: Reading drawings and specifications, to determine the layout of water supply, waste, and venting systems

  9. Washington Suburban Sanitary Commission - Wikipedia

    en.wikipedia.org/wiki/Washington_Suburban...

    The Washington Suburban Sanitary Commission (WSSC Water) is a bi-county political subdivision of the State of Maryland [2] that provides safe drinking water and wastewater treatment for Montgomery and Prince George's Counties in Maryland except for a few cities in both counties that continue to operate their own water facilities.

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