Sikuliaq Tension Members
Find tension member specifications, SWLs and Assigned Breaking Loads(ABL) below.
| Man # | NSF # | Description | Location | Break Test Date | ABL(lbs) | Safety Factor(SF) | Safe Working Load(SWL) | |
| Q61221-C1 | NSF-21-EO05 | .322" EO | Winch 1 | 3/28/2024 | 11,600 | 4.0 | 2,900 | |
| Q7221-C2 | NSF-15-C177 | .322" EM | Winch 2 | 3/28/2024 | 10,000 | 2.5 - 2.01 | 4,000 - 5,000 | |
| Q9641-C1 | NSF-15-FO11 | .681" Power Optic | Storage Drum 1 | 6/18/2024 | 42,000 | 2.5 | 16800 | |
| OTH-063 | 9/16"-3x19 Trawl Wire | Storage Drum 2 | 5/22/2024 | 32,500 | 2.5 - 1.52 | 13,000 - 21,667 | ||
| 3/16" Yale Ultrex | Stbd Crane-Underwire Winch | 6,000 | 5.0 | 1200 | ||||
| SB-51149 | .230" EM Cable | Stbd Crane-Underwire Winch | 3,000 | 5.0 | 600 |
1 - .322" EM SF lowered to 2.0 for deep CTD casts.
2 - 9/16" Trawl Wire SF lowered to 1.5 for piston coring and dredging.
Minimum Sheave Diameters for UNOLS Tension Members
| Tension Member | Manufacturer's Recommended Diameter | Tension member diameter (D) | Largest Wire Diameter (d1) | Minimum Sheave Diameter (dx40) | Minimum Sheave Diameter (d1x400) |
| 1/4"-3X19 | 12.5" | .250" | .0375" | 10.00" | 15.00" |
| 1/2"-3X19 | 23.5" | .500" | .071" | 20.00" | 28.40" |
| 9/16"-3X19 | 26.5" | .563" | .080" | 22.50" | 32.00" |
| .322" | 12" | .322" | 0.0375" | 12.88" | 15.00" |
| .680" | 28" | .680" | 0.060" | 27.20" | 24.00" |
| .681" | 48" | .681 | 0.049" | 27.24" | 19.60 |
Calibration Loads
Load Measurement combinations for high end calibration point required in UNOLS RVSS Appendix A.
| Tension Member | Nominal Breaking Load(NBL)(lbs) | Factor of Safety(FS) | Calibration Load(lbs) | Accuracy Required | Accuracy(lbs) |
| 9/16"-3X19 | 32,500 | 2.5 | 13,000 | 4% | 520.0 |
| 9/16"-3X19 | 32,500 | 2.0 | 16,250 | 3% | 487.5 |
| 9/16"-3X19 | 32,500 | 1.5 | 21,667 | 3% | 650.0 |
| .322 Cable | 11,600 | 2.5 | 4,640 | 4% | 185.6 |
| .322 Cable | 11,600 | 2.0 | 5,800 | 3% | 174.0 |
| .681 Cable | 42,000 | 2.5 | 16,800 | 4% | 672.0 |
| .681 Cable | 42,000 | 2.0 | 21,000 | 3% | 700.0 |
