Posted by Errin OH on December 20, 2010 at 08:29:13 from (144.230.191.36):
In Reply to: Measuring Pipe Techy posted by j heitkemper on December 20, 2010 at 06:57:11:
Any more, Pipe anyway, its neither. From Wiki;
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 0.5 inches (13 mm)�but it also had thick walls. As technology improved, thinner walls became possible, but the outside diameter stayed the same so it could mate with existing older pipe, increasing the inner diameter beyond half an inch. The history of copper pipe is similar. In the 1930s, 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. The wall thickness on modern copper is usually thinner than 1⁄16 inches (1.6 mm), so the internal diameter is only "nominal" rather than a controlling dimension.[5]
Now if you are looking to get some replacement hi pressure tubing I would sart by finding a chart on tubing and compair some measurements. If its pipe well, I know for a fact that 1.5" sch 40 "welded pipe" is; 1.9" OD, .145" wall, leaving the ID 1.61". Hi pressure tubing may be different, but pipe should follow the standard.
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