Page 189 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

178 CHAPTER 8 Cables and Connectors
Retaining devices
Retaining devices include:
• Locking sleeves or lock collars (Figures 8.23 and 8.24)
• Straps (Figures 8.25 and 8.26)
Strain reliefs
Strain reliefs (Figures 8.27 and 8.28) transition the stress from the point where the cable meets the connector along a greater length of cable. These are also known as “bending strain reliefs.” Excessive flexing at the junction between the cable and connector is the most common failure mode of underwater connectors.
Cable grips
Cable grips transfer a load from the cable to another object (see Section 8.8.13).
Strength ratings
The following strength ratings apply to cables, terminations, cable grips, shackles, and handling equipment:
• BS- break strength or material yield
• SWL- safe working load
• Safety factor- BS/SWL and varies with application (e.g., manned versus unmanned)
FIGURE 8.23
(a) In-line locking sleeve pairs have matching internal and external threads and come in different sizes to fit different connector body sizes. (b) Locking sleeves may be color coded for circuit identification.
(Courtesy Ocean Innovations.)