Method of testing pipes for leakage

Details Method of testing pipes for leakage Method of testing pipes for leakage

1996-03-12

1997-03-11

Brock, Michael

Measuring and testing

With fluid pressure

Leakage

73 491, G01M 328

Patent

active

056103239

ABSTRACT:
Air is passed under pressure into a pipe under test and into a reference chamber connected to the pipe by a valve while recording at intervals of every few seconds the temperature in the reference chamber, the temperature in the pipe and the absolute pressure in the reference chamber. When the test pressure has been reached the valve is closed and the differential pressure between the pipe and the reference chamber is measured. The valve is opened to equalize the pressure and then closed again and the differential pressure drift rate is measured. This is repeated several times. A computer is used to calculate a creep prediction curve. A comparison is made to see whether the pressure drift rate due to creep and leak only in the pipe independent of any temperature change in the pipe is trending towards crossing the curve or not.

REFERENCES:
patent: 3756072 (1973-09-01), MacMurray
patent: 4571986 (1986-02-01), Fujii et al.
patent: 5170657 (1992-12-01), Maresca, Jr. et al.
patent: 5201212 (1993-04-01), Williams
patent: 5367797 (1994-11-01), Zaim

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