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:
“And thus Snow White became the prince’s bride.
The wicked queen was invited to the wedding feast
and when she arrived there were
red-hot iron shoes,
in the manner of red-hot roller skates,
clamped upon her feet.”
—Anne Sexton (1928–1974)
“Blest are those
Whose blood and judgment are so well commingled
That they are not a pipe for Fortune’s finger
To sound what stop she please.”
—William Shakespeare (1564–1616)
“One writes of scars healed, a loose parallel to the pathology of the skin, but there is no such thing in the life of an individual. There are open wounds, shrunk sometimes to the size of a pin-prick but wounds still. The marks of suffering are more comparable to the loss of a finger, or the sight of an eye. We may not miss them, either, for one minute in a year, but if we should there is nothing to be done about it.”
—F. Scott Fitzgerald (1896–1940)