Iron Pipe Size (IPS) refers to an old pipe sizing system still in use by some industries, including major PVC pipe manufacturers, as well as some legacy drawings and equipment.
The iron pipe size standard came into being early in the 19th century and remained in effect until after World War II. The IPS system was primarily used in the US and the United Kingdom. In the 1920s, the Copper Tube Size (CTS) standard was combined with the IPS standard.
During the IPS period, pipes were cast in halves and welded together, and pipes' dimensions were sized by reference to the inside diameters of the pipes . The inside diameters under IPS were roughly as we know them today under the Ductile Iron Pipe Standard (DIPS) and Nominal Pipe Size (NPS) Standards, and some of the wall thicknesses were also retained with a different designator. In 1948, the DIPS came into effect, when greater control of a pipe's wall thickness was possible.
CTS diameter always specifies the OD of a tube, where pipe diameter specifications only approximate the pipe ID for sizes of 12 inch or less, and STD wall thickness. The IPS number (reference to an OD) is the same as the NPS number, but the schedules were limited to Standard Wall (STD), Extra Strong, (XS) and Double Extra Strong (XXS). STD is identical to SCH 40 for NPS 1/8 to NPS 10, inclusive, and indicates .375" wall thickness for NPS 12 and larger. XS is identical to SCH 80 for NPS 1/8 to NPS 8, inclusive, and indicates .500" wall thickness for NPS 8 and larger. Different definitions exist for XXS, but it is generally thicker than schedule 160.
Famous quotes containing the words iron, pipe and/or size:
“Summer involves going down as a steep flight of steps
To a narrow ledge over the water. Is this it, then,
This iron comfort, these reasonable taboos,
Or did you mean it when you stopped? And the face
Resembles yours, the one reflected in the water.”
—John Ashbery (b. 1927)
““Wotever is, is right, as the young nobleman sveetly remarked wen they put him down in the pension list ‘cos his mother’s uncle’s vife’s grandfather vunce lit the king’s pipe vith a portable tinder-box.””
—Charles Dickens (1812–1870)
“Learn to shrink yourself to the size of the company you are in. Take their tone, whatever it may be, and excell in it if you can; but never pretend to give the tone. A free conversation will no more bear a dictator than a free government will.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)