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• W2009294418 abstract "ABSTRACT Subsea barrier valves are used to prevent backflow of an offshore pipeline in the event of an upstream line rupture. These valves are either a ball valve or check valve configuration. As offshore production systems and their associated pipelines move into deeper waters, the maintenance of these valves becomes .more difficult and expensive due to the cost of diving operations. Eventually these valves are placed in locations where the water depth precludes the use of divers for maintenance tasks. It is then necessary to develop alternate maintenance methods for these valves. This paper outlines the development, testing, and deployment of a check type barrier valve for use in water depths beyond diver access. The system follows a maintenance through retrieval approach, using an intervention tool run from the surface on guidelines to retrieve the primary active components to the surface for replacement or repair. INTRODUCTION A 10 ANSI 900# (+) check type barrier valve system was developed for installation on a TLP drilling template in the Norwegion sector of the North sea. This template is installed in a water depth of 1010 ft, placing it beyond the depth normally associated with saturation diving operations. With the practical elimination of diver intervention to the barrier valve, and with the increased emphasis on subsea hardware maintenance and repair, the barrier valve system was configured for diverless operation and maintenance. The barrier valve system includes a retrievable actuator which is used to place the valve in a locked open position to allow the passage of an intelligent inspection pig. This actuator is primarily controlled hydraulically via an acoustic/hydraulic power pack (provided by others). In the event of a control system failure, the valve may be opened via an ROV override feature built into the actuator. The unique feature of this barrier valve is the ability to retrieve the internal working components as a single cartridge without diver intervention. This is achieved by using a collet type connector to attach the valve cover to the valve body and by using a hydraulically controlled valve intervention tool (VIT) to release and set that connector. The complete system is depicted in Figure 1. SYSTEM DESIGN AND FUNCITONAL REQUIREMENTS The barrier valve system was designed to interface with the other systems in the TLP production system, consequently these interface points were documented and set as limiting design criteria. Also, while staying within these criteria, the system was to be able to meet specific functional requirements. The limiting criteria and functional requirements for the system are documented below. Design Criteria The barrier valve system was designed to operate in a 10 gas pipeline at the base of the TLP riser, 1010 ft from the surface. The valve was designed for a maximum working pressure of 2285 psi, but unlike ANSI valves which are tested to 1.5 times working pressure, the barrier valve test pressure was 4570 psi (2 × working)." @default.
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• W2009294418 date "1991-05-06" @default.
• W2009294418 modified "2023-10-16" @default.
• W2009294418 title "Diverless Maintenance of a Subsea Barrier Valve" @default.
• W2009294418 doi "https://doi.org/10.4043/6620-ms" @default.
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