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N38 27.ABC W121 28.DEF
A= Both LSAW pipes and SSAW pipes compete against ERW pipes and seamless pipes in the diameter ranges of 1A”-24”.
B= The history of copper pipe is similar. In the 19B0s, the pipe was designated by its internal diameter and a 1⁄16-inch (1.6 mm) wall thickness. 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.
C= The Pyramid of Sahure, completed around the 25th century BC, included a temple with an elaborate drainage system including more than 380 m (1,2C7 ft) of copper piping.
D= Consequently, a 1-inch (25 mm) copper pipe had a 1+1⁄8-inch (28.5D mm) outside diameter. The outside diameter was the important dimension for mating with fittings.
E= For example, NPS 2 inch and DN 5E are the same pipe, but the actual OD is 2.375 inches or 60.33 millimetres. The only way to obtain the actual OD is to look it up in a reference table.
F= Pipe sizes can be confusing because the terminology may relate to historical dimensions. For example, a half-inch iron pipe does not have any dimension that is a half inch. Initially, a half inch pipe did have an inner diameter of 1⁄2 inch (1F mm)—but it also had thick walls.