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SWL, MSL and Breaking Strain |
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Written by Stelios Kontozoglou
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Tuesday, 27 October 2009 07:43 |
BREAKING STRAIN
For Manilla, Breaking Strain = Circumference2 [tonnes]
2.5
For Wire, Breaking Strain = Circumference2 x 2.5 [tonnes]
SAFE WORKING LOAD
SWL = Breaking Strength
Safety Factor
MAXIMUM SECURING LOAD (MSL)
| Material | MSL |
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| Shackles, rings, deck eyes, turnbuckles made of mild steel | 50% of Breaking Strength |
| Fibre rope | 33% of Breaking Strength |
| Wire rope (single use) | 80% of Breaking Strength |
| Wire rope (re-useable) | 30% of Breaking Strength |
| Steel band (single use) | 70% of Breaking Strength |
| Chains made of mild steel | 50% of Breaking Strength |
| Chains made of high tensile steel | 33% of Breaking Strength |
In a combination of securing gear with different MSL for lashing, the
overall lashing strength would equal the weakest link used, i.e. the gear with the smallest MSL.
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