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Actuator design component vs. system approach

The design of subsea valve actuators must address critical factors such as marine growth, fouling, corrosion, and hydraulic fluid conditions. Actuators must generate sufficient force to operate valves under the most difficult design scenarios without exceeding 90% of hydraulic operating pressure. This requirement ensures that actuators function effectively during Factory Acceptance Testing (FAT) and Site Integration Testing (SIT), accommodating variations in environmental pressure without compromising performance. Circuit optimization is essential to enhance system efficiency and minimize pressure loss.

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Actuator design component vs. system approach

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  1. Actuator design component vs. system approach Jens-Henrik Neuenkirchen

  2. Requirement from 13628-4 / 17D 7.10.2.2.2 General The following requirements apply to the design of subsea valve actuators. a) Design shall consider marine growth, fouling, corrosion, hydraulic operating fluid and, if exposed, the wellstream fluid. b) Subsea actuator opening and closing force shall be sufficient to operate the subsea valve when the valve is at the most severe design operating conditions without exceeding 90 % of the hydraulic operating pressure as defined in 7.10.2.2.2 c). This requirement is intended to ensure that the actuator is adequately designed to operate with the hydraulic power source at FAT and SIT without the pressure (ambient external and hydraulic pressure head) associated with water depth.

  3. Load Load • A Larger Piston diameter • Less Pressure (PL) for a given load • More Fluid Driving Pressure PL PL • A Smaller Piston diameter • Reduced Flow Rate • Reduced Resistance to Flow • More Pressure to drive Load Conflicting Claims Claim A: ClaimB:

  4. Load Load PL PL Conflicting Claims Claim B: Claim A: The Challenge: • Claims A and B cannot both be true • Maybe none of them are true?

  5. Circuit Optimisation The basic hydraulic production control system Umbilical dp 10% Actuator dp 90%

  6. Circuit Optimisation The Basis for Subsea Control System Pressure Optimisation N = transmitted power N  (Ps- PL) *PL 5,000 psi LP supply system

  7. Circuit Optimisation The basic hydraulic production control system Umbilical dp 10% Should be 50% to optimise umbilical system Actuator dp 90% Should be lower than 90% to optimise total system

  8. Thank you Presentation title Presenters name Presenters title E-mail address, tel: +00 00 00 00 www.statoil.com

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