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 2/16/2023 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


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