Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1984-02-06
1985-07-16
Levy, Stewart J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73149, 73 494, G01M 302
Patent
active
045288402
ABSTRACT:
A hydrostatic test stand provides proof-testing of pressure vessels by measuring the amount of total deformation and permanent deformation as a result of a hydrostatic pressure applied to the pressure vessel. The test stand includes a transfer cylinder (which contains a floating piston and a bias spring), first and second control valves, a graduated cylinder, a pressure sensor, an oil reservoir, a booster pump, a booster pump valve, and quick-connect couplings. The pressure vessel is filled with water and connected to the couplings. With all of the valves open, the piston is at the lower end of the cylinder, and water is used to fill a first volume above the piston and the fluid lines to the pressure vessel, as well as filling the graduated cylinder to a predetermined first level. The first control valve and the booster pump valve are then closed and the booster pump is operated to drive the piston upward by oil pressure until a predetermined pressure has been reached in the pressure vessel. The second control valve is then closed, and the booster pump valve and the first control valve are opened, thus permitting the piston to move downward to its home position, which draws liquid from the graduate cylinder into the transfer cylinder. The second control valve is then opened to allow the pressure vessel to contract and force water back into the graduate cylinder. By comparing the first level of water in the graduate cylinder with the second and third levels after the first and second control valves are opened, a measure of dynamic and static deformation of the pressure vessel is obtained.
REFERENCES:
patent: 1783412 (1930-12-01), Crowe
patent: 2353275 (1944-07-01), Clair
patent: 2539843 (1951-01-01), Kerr
patent: 2652717 (1953-09-01), Bush et al.
patent: 2821851 (1958-02-01), Daley
patent: 3151478 (1964-10-01), Heldenbrand
patent: 3577768 (1971-05-01), Aprill, Jr.
patent: 4090394 (1978-05-01), Herman et al.
Levy Stewart J.
Williams Hezron E.
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