Page 542 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition
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20.1 Manipulator-operated tooling 539
Table 20.2 ISO Standard Torque Tool Classes
Class Max. Design Torque in N-m (lbf-ft)
1 67 (50)
2 271 (200)
3 1355 (1000)
4 2711 (2000)
5 6779 (5000)
6 13,558 (10,000)
7 33,895 (25,000)
Source: From Table 3 of ISO 13628-8.
into the tool (the so-called Smart Torque Tool) for both mechanical or digital counting of the torque forces and/or turns.
Figure 20.5 provides an example of the ISO 13628 (API 17D/H) Class 14 torque tool. The Seanic torque tool includes a digital display that provides real-time torque and turns subsea as well as on the surface, via laptop control. The tool can be supplied as a stand-alone smart tool or with a proportional valve pack, laptop, and GUI that can limit torques, control speed, and direction as well as log values. A robust latch system securely locks the tool into the subsea bucket. In the case of an unforeseen power failure, the latches are spring loaded and will retract, allowing safe disconnection from the work site.
• Cable cutter
While the various types of cutters are not standardized items within the purview of ISO 13628-8, they are commonly used within the subsea construction application and are mentioned here. The open face cutting tool (Figure 20.6a) is used to cut wire rope, cables, and umbilical up to 1.5 inch (38 mm) diame- ter. The 49 lb (22 kg) cutter operates on 3200 psi (220 bar) maximum hydraulic pressure for chain, steel sections, and other hard materials. Also available in either vehicle-integrated or ROT deployment config- urations is the gate-face cutting tool (Figure 20.6b) for cutting large diameter hard lines. For those very heavy-duty operations (best left to an ROT configuration), the 38 inch (955 mm) tall, 651 lb (295 kg) cut- ter can use up to 10,000 psi (690 bar) to cut wire rope and cables up to 7.5 inch (190 mm) diameter.
• Rotary cutter
Rotary cutters come in various sizes and types. The cutter shown in Figure 20.7 is rated for 10,000 FSW (3300 m), and with its ability to cut up to a maximum of 6 inches (152 mm), schedule 40 pipe makes it ideally suited for almost any subsea steel cutting requirements. This grinder is powered by an industry-accepted and commonly used thruster motor driving a 4 inch (102 mm) cutter with a self-contained grab. The feed and cut unit is suitable for cutting pipe, cable, or grout hose. The jaw grips the item to be cut with the cutter disk rotating and is fed onto the work piece at a controlled rate to make the cut.
• Cable and tube grippers
Other non-ISO tools include the cable gripper (Figure 20.8a). This tool forms the link between a recovery line from the surface vessel and a submarine cable when the cable is to be brought to the
