Safety shutdown valve (SSV) control system in the field.

Safety Shutdown Valve Control System

Reliable protection for wells and flowlines

Fail-safe shutdown of flow

The Cameron safety shutdown valve (SSV) control system provides fail-safe shutdown of flow when pressure in the flowline falls outside a preset range. The system can also be used to perform emergency shutdown (ESD). Using a hand pump with various control components, the system maintains a zero-leakage circuit to ensure that valve movement does not inadvertently occur until a fail-safe signal is received. Controls are typically pilot tripped, but solenoids can also be used for remote control where electricity is available. The control must be manually reset after a fail-safe operation has occurred. In the event of hydraulic control line pressure loss, the valve moves to the fail-safe position.

Easy operation

To open: Set the arming valve to the ready position and operate the hand pump until the actuator has reached the fully open position. For a remote option, a solenoid valve must also be energized prior to hand pumping. For an automatic option, normal sensing pressure must be available to pilot valve prior to hand pumping.

To close: For local operation, manually trip the arming valve to the fail position. For a remote operation, deenergizing the solenoid valve will trip the arming valve. With an automatic option, any abnormal increase or decrease of pilot sensing pressure will trip the arming valve.

Output gauge pressure: 5,000 psi [345 bar]

Seal material rating: –50 to 212 degF [–46 to 100 degC]

Standard features bring multiple advantages

Manifold design subplate provides a robust foundation for integration of all standard and optional control system components.
Subplate and control components are constructed of corrosion-resistant anodized aluminum with stainless steel internals.
Oil reservoir is a rugged fabrication of stainless steel to withstand harsh working environments and provide a corrosion-free environment for the fluid.

The self-contained control unit on a linear actuator

The self-contained control unit is shown on a linear actuator, which helps to operate a 3 1/8-in API 6A gate valve. The control is displayed as if the optional pilot valve (not illustrated) were installed on the pipeline. Custom tubing connections made between the control and pilot valve are required.

Dual filtration within the hydraulic circuit ensures that only contaminant-free hydraulic fluid is moving within the system to extend zero-leak performance.
Manual arming valve arms the system and provides quick fail-safe manual response in the event of an emergency.
Bright red-colored handle on the manual arming valve provides highly visible local verification of the system status being armed or tripped.
Reduced-pressure control system provides access to a broad range of low-pressure, zero-leakage control options (e.g., pilot valves, low-wattage solenoids, and fusible plugs).
Temperature compensation of a high-pressure actuator circuit and a low-pressure control circuit is accomplished with two separate accumulators. This assures system stability by reducing relief valve operation and eliminating valve creep due to extreme temperature changes.
Overpressure protection of a high-pressure actuator circuit and a low-pressure control circuit is provided with two separately designated relief valves. This isolates the relief valve operation to abnormally excessive pressure, which reduces potential leak points that result in valve drift.
Stainless steel pressure gauges with dual-scale indication ensure easy verification of high- and low-pressure circuit operating pressures.
Liquid-level gauge easily confirms the proper operating level of hydraulic fluid in the oil reservoir.
Manifold porting provides spring return actuators with a closed-loop exhaust circuit to eliminate the detrimental effects of airborne contaminants entering the actuator cylinder.