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Subsea ROV Rotary Safety Device for Latching and Unlatching Manual Valves

IP.com Disclosure Number: IPCOM000241930D
Publication Date: 2015-Jun-09
Document File: 2 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Abstract

In current subsea fields, the majority of subsea manual valves are latched and unlatched via a hydraulic powered torque tool. These valves may have a damage torque less than that classified by Class IV, however, the Remotely Operated Vehicle (ROV) bucket supplied on these valves typically accommodates a Class I-IV torque tool. This torque tool needs to be calibrated for the actual breaking torque specified by the valve manufacturer. In some instances, without proper calibration, a Class IV torque tool can exceed the maximum allowable torque required to latch/unlatch the valve, subsequently damaging the valve. The damage from over torqueing the valve could leave the valve permanently stuck inside the bucket and/or fixed in position (i.e. ROV is unable to open or close the valve). A method to latch and unlatch a subsea manual valve is needed which will prevent possible over torque of the valve. Having a custom subsea manual valve latching and unlatching tool to prevent over torqueing which contains an over torque prevention mechanism would replace a hydraulically powered torque tool. This is necessary in order to increase integrity and robustness of latching/unlatching subsea manual valves, protect project operational flexibility, and avoid production downtime.

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Subsea ROV Rotary Safety Device for Latching and Unlatching Manual Valves

Abstract

In current subsea fields, the majority of subsea manual valves are latched and unlatched via a hydraulic powered torque tool. These valves may have a damage torque less than that classified by Class IV, however, the Remotely Operated Vehicle (ROV) bucket supplied on these valves typically accommodates a Class I-IV torque tool. This torque tool needs to be calibrated for the actual breaking torque specified by the valve manufacturer. In some instances, without proper calibration, a Class IV torque tool can exceed the maximum allowable torque required to latch/unlatch the valve, subsequently damaging the valve. The damage from over torqueing the valve could leave the valve permanently stuck inside the bucket and/or fixed in position (i.e. ROV is unable to open or close the valve).

A method to latch and unlatch a subsea manual valve is needed which will prevent possible over torque of the valve. Having a custom subsea manual valve latching and unlatching tool to prevent over torqueing which contains an over torque prevention mechanism would replace a hydraulically powered torque tool. This is necessary in order to increase integrity and robustness of latching/unlatching subsea manual valves, protect project operational flexibility, and avoid production downtime.

Need for Invention

In some instances subsea manual valves are over torqued using a hydraulically powered Class IV torque tool as the Remotely Operated Vehicle (ROV) bucket supplied on the valves typically accommodates Class I-IV torque tool but the valves may have a damage torque less than the calibration specified on a Class IV torque tool.

A method to latch and unlatch a subsea manual valve is needed which will prevent possible over torque of the valve. This is necessary in order to increase integrity and robustness of latching/unlatching subsea manual valves, protect project operational flexibility, and avoid production downtime. The following concerns have been observed with the use of a standard ROV Class IV torque tool for latching and unlatching subsea manual valves:

-       There is no “hard” me...