Plastic pipe tester with feedback controlled pressurizer

Details Plastic pipe tester with feedback controlled pressurizer Plastic pipe tester with feedback controlled pressurizer

1982-03-05

1983-11-22

Goldberg, Gerald

Measuring and testing

With fluid pressure

Pipe

G01M 328

Patent

active

044161468

ABSTRACT:
The disclosed apparatus subjects samples of pipe, preferably plastic pipe, to controlled internal hydrostatic pressure in order to test the ability of that sample to withstand such pressure without catastrophic failure. A hydraulic pressure source (10) which preferably includes a variable volume compensated pump (12) and pair of accumulators (17) and (18) and applies the source pressure through a servo controlled pressure control valve (22) to a water filled sample (S). The hydrostatic pressure of the water within sample (S) generates an electrical signal proportional thereto via pressure transducer (24) and amplifier (25). This first signal is compared to an electronically generated second signal from a function generator (27). This second signal is proportional to the desired pressure within the sample (S). These first and second signals are compared by differential amplifier (28) which generates a third signal proportional to the difference between the first and second signals. This third signal is transmitted to valve (22) via signal processing circuitry (29) which controls the application hydraulic fluid to the pressure transmitter (32) in order precisely and controllably apply the hydrostatic pressure to the sample (S) over the testing period.

REFERENCES:
patent: 2895328 (1959-07-01), Payne, Jr. et al.
patent: 3151478 (1964-10-01), Heldenbrand
patent: 3383905 (1968-05-01), Sewos et al.
patent: 3554006 (1971-01-01), Windle
patent: 3916673 (1975-11-01), Gass et al.
patent: 4167868 (1979-09-01), Bobo et al.
Rig for Testing Large-Diameter Pipes Under Pulsating Internal Pressure, Aistov, Industrial Laboratory, vol. 41, No. 1, pp. 141-142, Jan. 1975.

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