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  2. Virginia Graeme Baker Pool and Spa Safety Act - Wikipedia

    en.wikipedia.org/wiki/Virginia_Graeme_Baker_Pool...

    In addition, all public pools and spas with a single main drain - other than an un-blockable drain - shall also employ one or more of the following devices: separated drain system per ANSI/APSP 7, safety vacuum release system (SVRS) that complies with ANSI/ASME A112.19.17 or ASTM F2387; suction-limiting vent system; gravity drainage system ...

  3. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    If these deviations are large, the surface is rough; if they are small, the surface is smooth. Roughness is typically assumed to be the high-frequency, short-wavelength component of a measured surface. However, in practice it is often necessary to know both the amplitude and frequency to ensure that a surface is fit for a purpose.

  4. Pool suction-drain injury - Wikipedia

    en.wikipedia.org/wiki/Pool_suction-drain_injury

    Pool suction-drain injury, also known as suction entrapment, occurs when the drain of a wading pool, swimming pool, hot tub, or fountain sucks in a swimmer's jewelry, torso, limbs, hair or buttocks. In some cases of buttocks entrapment, victims are disemboweled .

  5. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    Measurements of fluid flow in artificially roughened pipes by J. Nikuradse [5] were at the time too recent to include in Pigott's chart. The chart's purpose was to provide a graphical representation of the function of C. F. Colebrook in collaboration with C. M. White, [ 6 ] which provided a practical form of transition curve to bridge the ...

  6. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    The most common measurements are with Class 1 instruments, capable of directly measuring the road profile, and Class 3 instruments, which use correlation equations. Using World Bank terminology, these correspond to Information Quality Level (IQL) 1 and IQL-3 devices, representing the relative accuracy of the measurements. [ 15 ]

  7. Copper tubing - Wikipedia

    en.wikipedia.org/wiki/Copper_tubing

    Copper pipes in Australia are referenced to their DN (diamètre nominal) number, which is a nominal millimeter equivalent to their actual Imperial size. For example, DN20 is the size for copper pipe with an outside diameter of 19.05 mm or 3 ⁄ 4 inch.

  8. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    Engineering drawings specify the requirements of a component or assembly which can be complicated. Standards provide rules for their specification and interpretation. Standardization also aids internationalization , because people from different countries who speak different languages can read the same engineering drawing, and interpret it the ...

  9. Drain (plumbing) - Wikipedia

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

    A drain cover is a cover with holes (e.g. a manhole) or a grating used to cover a drain, to prevent unwanted entry of foreign objects, or injury to people or animals. It allows drainage of liquids but prevents entry from large solid objects, and thus acts as a coarse filter. A sink drain cover is a drain cover used to cover the sink drain.

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