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A most critical valve in a Subsea safety system is the Subsea Isolation Valve (SSIV) and its job is to Close on Demand to minimize the risk to the environment and the asset. Its purpose is to provide a reliable automatic sub-sea isolation system to prevent the loss of containment from the pipeline in the event that the riser ruptures.

This valve is located between the flowlines and the risers and is normally situated on the Flowline Termination Assembly (FTA) about 500 metres from the facility. The SSIV is the means of connecting the flow-lines and/or the export pipelines to the rigid risers and, thereafter, to a fixed or floating offshore platform.

SSIVs are installed, in subsea flowlines as a fundamental safety design criterion and, depending on the application, the valve choice will feature a Metal Seated Hydraulic Spring Return Actuator and either a Through Conduit Gate Valve or a Ball Valve coupled with a Swing Check Valve to prevent back flow.

BEL Valves offers high integrity valves in both of these configurations.

Through Conduit Gate Valves (TCGVs) are manufactured to order and supplied with a range of connections. Their Pressure ratings are to 15,000psi, Temperature ranges from -46 to +175 Deg C and Bore sizes from 1/2” to 42’’.

A range of Qualified Ball Valves comes in Bore sizes from 2” to 42’’ with end and top entry configurations and includes large bore, tight shut-off valves that meet the requirements for Specialist, High Integrity Subsea Applications.

All of these valves are available in Standard and Exotic Materials and Check Valves are available from the same source. Each type features metal to metal sealing and has their surfaces hard faced with Tungsten Carbide.

The Design Qualifications include API 6A, 17D, 6D, PR2, Hyperbaric, 1200 cycle and sand slurry testing. All valves can be configured with a rising stem on either Hydraulic Spring Return or Double Acting Hydraulic Actuators with ROV removable actuation and lever operation.

The 6A and 17D versions are available with cast or forged bodies and bonnets and the range of options underlines the engineering response from the integrated in-house capabilities at BEL Valves.