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  2. Plastic weld non-destructive examination - Wikipedia

    en.wikipedia.org/wiki/Plastic_weld_non...

    Evidence of leak can either be visual or by observing a change in pressure. When positive pressure is used, testing with non-compressible fluids is safer than using a gas. Gasses under pressure contain a significantly higher amount of stored energy than liquids and a rupture can pose a significant safety risk.

  3. High-density polyethylene - Wikipedia

    en.wikipedia.org/wiki/High-density_polyethylene

    HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]

  4. Landfill liner - Wikipedia

    en.wikipedia.org/wiki/Landfill_liner

    The next material surrounding the composite liner would be a leak detection system composed of another material like gravel with an additional geomembrane or complex liner. [4] The geomembranes within the composite liner consist of a high-density polyethylene which provide an effective minimization for flow and deliver and helpful barrier which ...

  5. Polyethylene - Wikipedia

    en.wikipedia.org/wiki/Polyethylene

    Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.

  6. HDPE pipe - Wikipedia

    en.wikipedia.org/wiki/HDPE_pipe

    HDPE pipe is a type of flexible plastic pipe used to transfer fluids and gases. It is often employed for replacing aging concrete or steel main pipelines . Constructed from the thermoplastic HDPE (high-density polyethylene ), it has low permeability and robust molecular bonding, making it suitable for high-pressure pipelines .

  7. Plastic pipework - Wikipedia

    en.wikipedia.org/wiki/Plastic_pipework

    Plastic Pipe lengths manufactured in Australia by extruding HDPE material.. Plastic pipe is a tubular section, or hollow cylinder, made of plastic.It is usually, but not necessarily, of circular cross-section, used mainly to convey substances which can flow—liquids and gases (fluids), slurries, powders and masses of small solids.

  8. Subsidy Scorecards: University of South Florida-Main Campus

    projects.huffingtonpost.com/projects/ncaa/...

    SOURCE: Integrated Postsecondary Education Data System, University of South Florida-Main Campus (2014, 2013, 2012, 2011, 2010).Read our methodology here.. HuffPost and The Chronicle examined 201 public D-I schools from 2010-2014.

  9. Leak detection - Wikipedia

    en.wikipedia.org/wiki/Leak_detection

    A leak appearing within an analytic region (a rule added to the camera) is immediately analyzed for its attributes, including thermal temperature, size, and behaviour (e.g. spraying, pooling, spilling). When a leak is determined to be valid based on set parameters, an alarm notification with leak video is generated and sent to a monitoring station.

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