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  2. Reef aquarium - Wikipedia

    en.wikipedia.org/wiki/Reef_aquarium

    A reef aquarium or reef tank is a marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the tropical coral reef environment. A reef aquarium requires appropriately intense lighting, turbulent water movement, and more stable water chemistry than fish-only marine ...

  3. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

  4. Fixture unit - Wikipedia

    en.wikipedia.org/wiki/Fixture_unit

    A Fixture Unit is not a flow rate unit but a design factor. A fixture unit is equal to 1 cubic foot (0.028 m 3) of water drained in a 1 + 1 ⁄ 4 inches (32 mm) diameter pipe over one minute. [2] One cubic foot of water is roughly 7.48 US gallons (28.3 L; 6.23 imp gal). A Fixture Unit is used in plumbing design for both water supply and waste ...

  5. Pumpjack - Wikipedia

    en.wikipedia.org/wiki/Pumpjack

    The scale of the technology is frequently smaller than for an oil well, and can typically fit on top of an existing hand-pumped well head. The technology is simple, typically using a parallel-bar double-cam lift driven from a low-power electric motor, although the number of pumpjacks with stroke lengths 54 inches (1.4 m) and longer being used ...

  6. Drain-waste-vent system - Wikipedia

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

    Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.

  7. Well drainage - Wikipedia

    en.wikipedia.org/wiki/Well_drainage

    The well filter must be placed in a permeable soil layer. The spacing can be calculated with a well spacing equation using discharge, aquifer properties, well depth and optimal depth of the water table. The determination of the optimum depth of the water table is the realm of drainage research.

  8. Isolation valve - Wikipedia

    en.wikipedia.org/wiki/Isolation_valve

    Isolation valves in a flare, relief or vent system must ensure that a flow path is always available to the flare or vent. These valves are secured in the open position (LO). Drain valves that connect a high pressure system to a low pressure drain system are locked in the closed position (LC) to prevent potential over-pressurisation of the drain ...

  9. Dry well - Wikipedia

    en.wikipedia.org/wiki/Dry_well

    A dry well or drywell is an underground structure that disposes of unwanted water, most commonly surface runoff and stormwater, in some cases greywater or water used in a groundwater heat pump. It is a gravity-fed , vertical underground system that can capture surface water from impervious surfaces , then store and gradually infiltrate the ...

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