Page 228 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

• break strength-with-field termination
• torque and rotation versus applied tension
• bending fatigue cycles simulating anticipated usage conditions including load, sheave diameters,
speed, temperature, etc.
Weight in air and seawater
• Weight in air is typically done on a 1-ft sample.
• Weight in seawater is usually calculated from the 1-ft sample weight and diameter.
More elaborate testing is possible, but exercise caution in interpreting results. Additional mechanical testing may include:
• Elongation versus tension (Figure 8.61)
• Torque/rotation versus tension
• Ultimate break strength
4000
3500
3000
2500
2000
1500
1000
500
0
Elongation versus tension Cycles 1–12
18 May 2005
8.9 Testing and troubleshooting 217
FIGURE 8.61
0.0 0.2
0.4 0.6 0.8 1.0 Elongation, percent
Elongation versus tension of a towed-array tow-cable.
(Courtesy Falmat.)
Tension, pounds