Subsea Choke Actuators | Schlumberger

Subsea Choke Actuators

Reduce erosion problems and ensure positive flow

Subsea choke actuator engineering drawing.

Cameron provides a variety of subsea choke actuators, including hydraulic "fail fixed" actuators in operating pressures of 3,000 and 5,000 psi, which are compatible with water or mineral-oil-based control fluids and optional stand-alone DC electric actuators.

Aqua-Torq actuator

The Aqua-Torq hydraulic stepping choke actuator, typically used on our clamp-style insert retrievable chokes, is designed to provide precise incremental steps from open to closed. Oil-filled and pressure compensated, this subsea choke actuator incorporates a marine growth-resistant local-position indicator and is available with an internal linear variable differential transformer (LVDT). The actuator is fitted with flushing ports, and the customer hydraulic interface usually is located near the weld tails on the stab-mate hydraulic couplers.

Subsea stepping linear choke actuator (SLCA)

Our SLCA offering is a more compact hydraulic stepping actuator, developed for use on non-retrievable chokes and now also used on Cameron's compact choke and CC80SR. The SLCA has two single-acting piston-pawl assemblies—one for open and one for closed. It is oil-filled and pressure-compensated with a remote-position feedback via an LVDT, a marine-growth-resistant local-position indicator and an ROV override.

Linear variable differential transformer (LVDT)

Our accurate LVDT electronic remote position feedback sensor is available for both Aqua-Torq and SLCA actuators. These non-contacting position sensors are seal welded, digitally calibrated and available in analog (4-20mA) and digital (CANBus) output designs. Reliable, field-proven, and individually hyperbarically tested to 11,400-foot (3475-meter) water depths, our LVDTs provide accurate choke position feedback to the subsea production control system

RD250 ROV gearbox

For use with Cameron non-retrievable chokes with either diver or ROV operation, our RD250 ROV gearbox is oil-filled and pressure-compensated. It also has an external marine-growth-resistant local-position indicator, which allows the choke setting to be read easily. The gearbox is available with LVDT position feedback.

Specifications  
Choke pressure
15,000 psi
Water depths
9,800 ft [3,000 m]
Hydraulic operating pressure
3,000 or 5,000 psi
Hydraulic operating fluid
Water- or oil-based
Manual or ROV override
API Spec 17D Class 3 or 4; High torque; special
Position feedback
LVDT analog (4 to 20 mA); digital CANbus
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