R/V OCEANUS
Rope and Cable Safe Working Loads

This is the documentation page for the R/V OCEANUS Rope and Cable Safe Working Loads (SWL) and current Factor of Safety (FS). Link to the PDF printable version.



Date: 20-April-2012

Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Column 8 Column 9 Column 10 Column 11 Column 12
System Description Rope-Cable/
Application
NBL (lbs) TBL (lbs) Test Date ABL (lbs) Minimum
Sheave Dia.
(in.)
D/d Monitoring
Freq. (Hz)
FS SWL (lbs) Comments
Desh-5
NSF-07-C140
0.322 Dia. EM
Free to Rotate
10,000 N/A No Test 10,000 18.5 57 20.0 2.0 5,000 No break test
NBL used for SWL
Desh-5
NSF-07-C140
0.322 Dia. EM
Fixed Ends
11,600 12,850 07/13/10 11,600 18.5 57 20.0 2.0 5,800 NBL used for SWL
COMM-15
NSF-06-C135
0.322 Dia. EM
Free to Rotate
10,000 N/A No Test 10,000 18.5 57 20.0 2.0 5,000 No break test
NBL used for SWL
COMM-15
NSF-06-C135
0.322 Dia. EM
Fixed Ends
11,600 13,650 09/13/11 11,600 18.5 57 20.0 2.0 5,800 NBL used for SWL
Deep Sea
NSF-90-T11
9/16" 3X19
Free to Rotate
32,500 N/A No Test 30,520 24 43 20.0 2.0 16,250
NBL used for SWL
Deep Sea
NSF-90-T11
9/16" 3X19
Fixed Ends
34,219 35,900 02/17/12 34,219 24 43 20.0 2.0 17,110 Used TBL for SWL
  • Each row in form represents a particular wire.
    Column 1: A brief description of the winch system.
    Column 2: The rope or cable used on that particular winch and type of application.
    Column 3: The Nominal Breaking Load (NBL), defined as the manufacturers minimum published breaking load of the rope or cable described in column 2.
    Column 4: The Tested Breaking Load (TBL), defined as the actual load required to pull the rope or cable to destruction as determined by testing.
    Column 5: Date the TBL testing was done.
    Column 6: The Assigned Breaking Load (ABL), Lowest of the NBL and TBL
    Column 7: The minimum sheave tread diameter in the sheave train that is used to overboard the cable.
    Column 8: The ratio of sheave diameter (D) to the rope or cable diameter (d). No larger than 40.
    Column 9: The sampling frequency of the tension monitoring equipment.
    Column 10: The Factor of Safety (FS) is the Ultimate Load* divided by the SWL.
    Column 11: The Safe Working Load (SWL) is the Ultimate Load* divided by the FS
    Column 12: Notes or comments.
    *The Ultimate Load for these purposes is assumed to be either the NBL or ABL. If the ABL is greater than or equal to the NBL, the NBL shall be used.