Page 214 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

8.8 Underwater cable design 203
FIGURE 8.46
Plastic insulation properties.
The jacket is the outer, overall covering of the cable. It is snag and cut resistant and keeps the interior bundle from kinking and hockling. Materials widely used include:
 Polyurethane
 Polyolefin (PE and PP)
 Thermoplastic elastomer (TPE)
8.8.10 Strength member
The most common material used in umbilical construction is steel armor wire, including:






• •
Galvanized improved plow steel (GIPS)
Galvanized extra-improved plow steel (GEIPS)
High-tensile alloys for greater corrosion resistance (i.e., Nitronic-50)
The most common materials used for tether construction are synthetic yarns, including:
Aramid fiber (Kevlars and Twarons) Liquid crystal polymer (Vectrans) PBO (Zylons)
Examples of EM cable composite constructions include:
Steel wire strength member (Figure 8.47) Synthetic strength member (Figure 8.48)
(Courtesy Falmat.)