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  2. Underground storage tank - Wikipedia

    en.wikipedia.org/wiki/Underground_storage_tank

    An underground storage tank (UST) is, according to United States federal regulations, a storage tank, including any underground piping connected to the tank, that has at least 10 percent of its volume underground.

  3. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Fitting being crimped using a specialized tool Pressfittings connection with dead space around the O-ring. Crimped or pressed connections to use special fittings permanently attached to tubing with a powered crimper. The fittings, manufactured with a pre-installed sealant or O-ring, slide over the tubing to be connected. High pressure is used ...

  4. Compression fitting - Wikipedia

    en.wikipedia.org/wiki/Compression_fitting

    A compression fitting 15 mm isolating valve. A compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. . In instances where two pipes made of dissimilar materials are to be joined (most commonly PVC and copper), the fittings will be made of one or more compatible materials appropriate for the connect

  5. Crown closure - Wikipedia

    en.wikipedia.org/wiki/Crown_closure

    Crown closure and crown cover are two slightly different measures of the forest canopy and that determine the amount of light able to penetrate to the forest floor. Crown closure, also known as canopy closure, is an integrated measure of the canopy "over a segment of the sky hemisphere above one point on the ground".

  6. University of Santo Tomas Main Building - Wikipedia

    en.wikipedia.org/wiki/University_of_Santo_Tomas...

    After the war, UST resumed operation, holding classes in the building. The university and the building was visited by Pope Paul VI in 1970 [2] and Pope John Paul II in 1995 when UST hosted World Youth Day 1995. In 2015, Pope Francis became the third pope to visit the university, but did not enter the building.

  7. 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).