Method and system for the controlled application of fluid pressure to a load, especially for pressure testing pipe
AssigneeSMS Meer GmbH
InventorsManfred Kolbe, Hans-Gunter Schiffers, Uwe Feldmann, Wolfgang Krutz
Life of this patent
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Abstract
A method and system for the controlled application of fluid pressure of a load, such as a large pipe to be pressure t sted utilized small pressure converters which are operated by a common controller at the hydraulic side to fill and pressurize the pipe. One pressure converter is decelerated as it approaches th end of its working stroke while the other pressure converter is accelerated so that the total displacement of the pressurizing fluid remains substantially constant over time.
Claims12
A method of controlled application of fluid pressure to a load, comprising the steps of:
- (a) providing at least two pressure converters each having an output side connectable through respective check valves with a source of a pressurizing fluid and with said load, a drive side pressurizable in opposite directions to draw said fluid into and discharge said fluid from a respective output side, and a connection between each pressure side and the respective output side whereby each pressure converter has a member displaceable by pressurization of the respective drive side;
- (b) measuring the displacement of each of said members;
- and
- (c) controlling the pressurization of each of said drive sides 80 as to reduce an output pressure of a respective output side of one of said pressure converters as the respective member approaches a limiting position in a pressure stroke of said one of said pressure converters, and complementarily increasing an output pressure of a respective output side of an ther of said pressure converters and a displacement of the respective member of said other pressure converter by initiating a pressure stroke of said other pressure converters.
A system for controlled application of fluid pressure to a load, comprising:
- at least two pressure converters each having an output side connectable through respective check valves with a source of a pressurizing fluid and with said load, a drive side pressurizable in opposite dir ctions to draw said fluid int and discharge said fluid from a respective output side, and a connection between each pressure side and the respective output side whereby each pressure converter has a member displaceable by pressurization of the respective drive side;
- a respective displacement measuring device cooperating with each of said members for measuring the displacement of each of said members:
- and
- a common control unit for controlling the pressurization of each of said drive sides so as to reduce an output pressure of a respective output side of one of said pressure converters as the respective member approaches a limiting position in a pressure stroke of said one of said pressure converters, and complementarily increasing an output pressure of a respective output side of another of said pressure converters and effecting a displacement of the respective member of said other pressure converter by initiating a pressure stroke f said other pressure converters.
Dependencies are inferred from the claim text.