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Butterfly valve in a large DN-size. Nominal diameter, abbreviated DN (diamètre nominal/Durchmesser nach Norm), is the designation system specified by ISO 6708 for specifying the diameter of trade sizes of metric pipework components, and is the metric equivalent to Nominal Pipe Size. [9]
In the construction industry, the 1:5:200 rule (or 1:5:200 ratio) is a rule of thumb that states that: . If the initial construction costs of a building is 1, then its maintenance and operating costs over the years is 5, and the business operating costs (salary of people working in that building) is 200.
wall-plates (at the top of timber-framed walls that support the trusses and joists of the roof). When jettying, horizontal elements can include: The jetty bressummer (or breastsummer), where the main sill (horizontal piece) on which the projecting wall above rests, stretches across the whole width of the jetty wall. The bressummer is itself ...
As previously noted, less wood is needed to produce a given finished size than when standards called for the green lumber to be the full nominal dimension. However, even the dimensions for finished lumber of a given nominal size have changed over time. In 1910, a typical finished 1-inch (25 mm) board was 13 ⁄ 16 in (21 mm). In 1928, that was ...
sill - a stud sized member forming the base of a window assembly or the base of wall. mudsill - a stud sized member that forms the base of a wall and has been treated against insects and decay. top plate or double top plate - a stud sized member that forms the top of the wall. In cases where other members must bear or brace on the top of the ...
The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada [1].It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters.
In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread.
The pipe wall thickness has a variance of approximately 12.5 percent. In the rest of Europe pressure piping uses the same pipe IDs and wall thicknesses as Nominal Pipe Size, but labels them with a metric Diameter Nominal (DN) instead of the imperial NPS. For NPS larger than 14, the DN is equal to the NPS multiplied by 25.
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