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  2. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    It is a pipe within a pipe, or encased in an outer covering, with an annulus (interstitial space) between the two diameters. The inner pipe is the primary or carrier pipe and the outer pipe is called the secondary or containment pipe. The great majority of double-walled piping applications involve wastewater, groundwater, and process safety. [1]

  3. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Class A are either an insulated, double wall stainless steel pipe or triple wall, air-insulated pipe often known by its genericized trade name Metalbestos. Class B are uninsulated double wall pipes often called B-vent, and are only used to vent non-condensing gas appliances. These may have an aluminum inside layer and galvanized steel outside ...

  4. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  5. Amazon's secret overstock section is bursting with savings ...

    www.aol.com/lifestyle/secret-savings-amazon...

    Solo Stove Mesa XL. $80 $100 Save $20. See at Amazon. DeWalt 20V Max Cordless Drill and Impact Driver. $129 $239 Save $110. See at Amazon. Kitchen. Cosori 6-Quart Air Fryer. $88 $120 Save $32 ...

  6. Biden says he hopes Trump rethinks tariffs on Mexico and Canada

    www.aol.com/news/biden-says-hopes-trump-rethinks...

    U.S. President Joe Biden on Thursday said he hoped President-elect Donald Trump would rethink his plan to impose tariffs on Mexico and Canada, saying it could "screw up" relationships with close ...

  7. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    The bodies of fittings for pipe and tubing are often the same base material as the pipe or tubing connected: copper, steel, PVC, CPVC, or ABS. Any material permitted by the plumbing, health, or building code (as applicable) may be used, but it must be compatible with the other materials in the system, the fluids being transported, and the ...

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