Multi capacity riser tensioners

摘要

A hydraulic cylinder unit for connection to a wire line riser tensioner system includes a hydraulic cylinder comprising a cylinder piston separating a first cylinder chamber from a second cylinder chamber. A low pressure tank is arranged as a closed cylinder. A first conduit is inserted into the closed cylinder and provides a fluid communication between the low pressure tank and the first cylinder chamber. A second conduit provides a fluid communication between a high pressure fluid reservoir and the second cylinder chamber. A feedback conduit provides a fluid communication between the first cylinder chamber and the second cylinder chamber. A valve element comprising at least one valve is configured to be in a fluid communication with the at least one first conduit and the at least one feedback conduit. The valve element is configured to provide a reversible switching between a first alternative configuration and a second alternative configuration.

主权项

1. A hydraulic cylinder unit for connection to a wire line riser tensioner system, the hydraulic cylinder unit comprising:
a hydraulic cylinder comprising a first cylinder chamber, a second cylinder chamber and at least one cylinder piston arranged to separate the first cylinder chamber from the second cylinder chamber, the at least one cylinder piston comprising a piston rod and a piston head; a low pressure tank arranged as a closed cylinder so as to comprise a desired pressure; at least one first conduit inserted into the closed cylinder of the low pressure tank and configured to provide a fluid communication between the low pressure tank and the first cylinder chamber; a high pressure fluid reservoir; at least one second conduit configured to provide a fluid communication between the high pressure fluid reservoir and the second cylinder chamber; at least one feedback conduit configured to provide a direct fluid communication between the first cylinder chamber and the second cylinder chamber; a valve element comprising at least one valve, the valve element being configured to be in a fluid communication with the at least one first conduit and the at least one feedback conduit, the valve element being configured to provide a reversible switching between either,
a first configuration comprising a first fluid obstruction between the low pressure tank and the first cylinder chamber, and a first fluid communication between the first cylinder chamber and the second cylinder chamber via the at least one feedback conduit, anda second configuration comprising a second fluid obstruction between the first cylinder chamber and the second cylinder chamber, and a second fluid communication between the low pressure tank and the first cylinder chamber via the at least one first conduit; at least one first sheave arranged at a first axial side of the first cylinder chamber; and at least one second sheave arranged at a second axial side of the first cylinder chamber, wherein, the wire line riser tensioner system comprises a riser tensioning cable and a riser, the riser tensioning cable being connectable to an end of the riser, and the at least one first sheave and the at least one second sheave are each configured to receive the riser tensioning cable during a use of the wire line riser tensioner system.