cosmetic High Accuracy Torque Multiplier for Wet Valve Actuation Norbar Torque tools has developed an innovative torque multiplierfor the subsea tools market. Designed as an adapter to allow API17D Class 4 intervention torque tools to generate the torquerequired to handle Class 7 applications, the new torque multiplierdelivers a higher level of accuracy than alternative solutions, andincreased flexibility in use through its added-value features andits ability to be configured in two standard lengths. The gear unit has been designed as an adapter for torque tools usedon subsea Christmas trees – the assemblies of control valves,gauges and chokes that control oil and gas flow at a well head.Installed on the ocean floor at depths of up to 3000m, these‘wet trees’ provide the ultimate challenge for thetorque tools designed to actuate the various valves. The valves come in various sizes with different torquerequirements, with the typically used subsea products ranging fromClass 1 valves with maximum torques of 68Nm up to Class 7 withtorques of 34,000Nm. Clearly it would be impractical to holddifferent tools for each valve, or to standardise only on thelargest tool on the off-chance of having to accommodate a Class 7valve now and again. So the gear adapter has become popular as ameans of extending a Class 4 tool (which would generate up to2,700Nm of torque) up to Class 7.
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