Class 7 Torque Tools
A torque tool is classified as Class 1 to Class 7 based on the amount of force it can handle. Merriam-Webster dictionary defines torque as "a force that produces or tends to produce rotation or torsion...; also : a measure of the effectiveness of such a force that consists of the product of the force and the perpendicular distance from the line of action of the force to the axis of rotation." A torque tool provides sufficient turning or twisting force to rotate a part or object. A torque tool can vary from a simple manual wrench to an encased heavy duty motor and gearbox, with Class 7 sockets and durable housing.
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Class 1 to Class 7 Torque Tools
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Class 1 to Class 7 torque tools operate to maximum torque capacities. Class 7 torque tool applications include deep undersea functions. Advance tools can contain a motor and gearbox that control the high pressure flow of oil and gases from a main source. Engineering Talk discusses the use of torque multipliers to increase the maximum force of a tool. It explains that "the valves come in various sizes with different torque requirements, with the typically used sub-sea products ranging from Class 1 valves with maximum torques of 68Nm up to Class 7 with torques of 34,000Nm" (newton metre).
Torque Measurement
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A Class 7 torque tool can handle a maximum torque capacity between 17,000Nm and 34,000Nm. Boltscience.com explains torque conversion as "the metric (SI) unit of torque is the newton metre (Nm). In inch units, torque is usually measured as Lb-Ft (pounds feet) or Lb-In (pounds inch)." This measurement determines the maximum torque capability of a Class 7 tool. The class may be changed by various valves and sockets. More-advanced tools include industry standard torque counters with an internal dual electronic counter or a visual turns counter. Alternatively, a tool-mounted electronic turns display can be battery powered.
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Specifications
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The specifications for a class 7 torque tool vary according to the maximum torque, materials, weight, interface and socket size options. The tool function quality depends on hydraulic oil, hydraulic connections, electrical connectors, internal sensors, case durability and designated manual operations. A class 7 torque tool may contain an ISO 13628-8 Fig 18 (Reduced Length) interface, with class 7 and class 6 socket options at 3-1/2" Square and 2-5/8" Square. This design allows for a maximum torque of 17,000Nm @ 140 Bar. Options include a torque verification unit, a torque tool control system and a hot stab interface.
Torque Tool Materials and Design
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A reliable class 7 torque tool can be designed from various durable materials. A tool can include a steel motor and gearbox with a titanium socket and aluminum housing. It operates on hydraulic oil such as mineral oil, through the hydraulic connectors and fittings. The electrical component can include a 8 pin connector, with internal, twin inductive sensors. The exterior housing is designed for offshore exploration and durability. A torque tool pushed beyond its maximum torque can fail. An overheated motor or broken gear can permanently damage the tool.
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References
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