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Barlow's formula (called "Kesselformel" [1] in German) relates the internal pressure that a pipe [2] can withstand to its dimensions and the strength of its material. This approximate formula is named after Peter Barlow , an English mathematician .
In practical engineering applications for cylinders (pipes and tubes), hoop stress is often re-arranged for pressure, and is called Barlow's formula. Inch-pound-second system (IPS) units for P are pounds-force per square inch (psi). Units for t, and d are inches (in). SI units for P are pascals (Pa), while t and d=2r are in meters (m).
For pipelines, this value is derived from Barlow's Formula, which takes into account wall thickness, diameter, allowable stress (which is a function of the material used), and a safety factor. The MAOP is less than the MAWP (maximum allowable working pressure).
Specified Minimum Yield Strength (SMYS) means the specified minimum yield strength for steel pipe manufactured in accordance with a listed specification 1.This is a common term used in the oil and gas industry for steel pipe used under the jurisdiction of the United States Department of Transportation.
Barlow's disease (disambiguation), a term for scurvy or for mitral valve prolapse; Barlow's formula, for calculation of the internal pressure that a pipe can withstand; Barlow knife, a certain pattern of traditional slipjoint pocket knife; Barlow's law, an incorrect theory of a wire's electric current-carrying ability
Barlow's law was an incorrect physical law proposed by Peter Barlow in 1825 to describe the ability of wires to conduct electricity. Bayes' theorem describes the probability of an event, based on prior knowledge of conditions that might be related to the event.
He is credited with the eponymous Barlow's wheel (an early homopolar electric motor) and with Barlow's law (an incorrect formula of electrical conductance). Barlow investigated a suggestion made by André-Marie Ampère in 1820 that an electromagnetic telegraph could be made by deflecting a compass needle with an electric current. In 1824 Barlow ...
Barlow's law is an incorrect physical law proposed by Peter Barlow in 1825 to describe the ability of wires to conduct electricity. [ 1 ] [ 2 ] It says that the strength of the effect of electricity passing through a wire varies inversely with the square root of its length and directly with the square root of its cross-sectional area, or, in ...