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  2. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3 ⁄ 4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread. The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′.

  3. Pipe bursting - Wikipedia

    en.wikipedia.org/wiki/Pipe_bursting

    Pipe bursting is a trenchless method of replacing buried pipelines (such as sewer, water, or natural gas pipes) without the need for a traditional construction trench. "Launching and receiving pits" replace the trench needed by conventional pipe-laying.

  4. Stovepipe - Wikipedia

    en.wikipedia.org/wiki/Stovepipe

    Stovepipe (organisation), where the structure of the organization restricts flow of information through rigid lines of control Stovepipe system or stovepiping, the informal name given to a category of criticisms applied to assemblages of technology

  5. 17-4 stainless steel - Wikipedia

    en.wikipedia.org/wiki/17-4_stainless_steel

    SAE Type 630 stainless steel (more commonly known as 17-4 PH, or simply 17-4; also known as UNS S17400) is a grade of martensitic precipitation hardened stainless steel. It contains approximately 15–17.5% chromium and 3–5% nickel, as well as 3–5% copper. [1] The name comes from the chemical makeup which is approximately 17% chromium and 4 ...

  6. Heat pipe - Wikipedia

    en.wikipedia.org/wiki/Heat_pipe

    A pipe one inch in diameter and two feet long can transfer 3.7 kW (13,000 BTU/h) at 1,800 °F (980 °C) with only 18 °F (10 °C) drop from end to end. [14] Some heat pipes have demonstrated a heat flux of more than 23 kW/cm 2 , about four times the heat flux through the surface of the Sun. [ 15 ]

  7. Devil's stovepipe - Wikipedia

    en.wikipedia.org/wiki/Devil's_stovepipe

    Hikers moving onto a dune encroaching on a forest in the Oregon Dunes.In time this may lead to devil's stovepipes in the area. A devil's stovepipe or decomposition chimney is a hole formed when a tree, that has been buried by an encroaching sand dune, decomposes. [1]