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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 ...
In the United States they are typically fabricated from 21-foot (6.4 m) sections of 1.5-inch (38 mm) nominal diameter, 1.9-inch (48 mm) outside diameter, schedule 40 steel pipe that are spliced together (with internal pipe sleeves and bolts) to provide a continuous member that stretches the width of a stage. Schedule 80 pipe is also used.
Lining bars have a tapered form. They often have a square cross section between one and 1-1/2 inches at one end. They may have a pyramidal, wedge, or pinch point. They transition to a tapered round cross section 12 to 18 inches from the point. The handle end may terminate in a ball or may be cut off squarely at 5/8 to 3/4 inch diameter.
Most threaded-pipe systems require strategically located pipe-union fittings in final assembly. The threaded pipe is heavy and requires adequate attachment to support its weight. To ensure a comprehensive pressure test, it is crucial to explicitly request a 3.1 certificate in accordance with EN HFF 10204:2004.
Consequently, a 1-inch (25 mm) copper pipe had a 1 + 1 ⁄ 8-inch (28.58 mm) outside diameter. The outside diameter was the important dimension for mating with fittings. The wall thickness on modern copper is usually thinner than 1 ⁄ 16-inch (1.6 mm), so the internal diameter is only "nominal" rather than a controlling dimension. [13]
During the IPS period, pipes were cast in halves and welded together, and pipe sizes referred to the inside diameters. [1] The inside diameters under IPS were roughly the same as the more modern Ductile Iron Pipe Standard (DIPS) and Nominal Pipe Size (NPS) Standards, and some of the wall thicknesses were also retained with a different ...