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Maximum Securing Load (MSL) is a term used to define the allowable load capacity for a device used to secure cargo to a ship. Safe Working Load (SWL) may be substituted for MSL for securing purposes, provided this is equal to or exceeds the strength defined by MSL. |
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The MSLs for different securing devices are given in table 1. |
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The MSL of timber should be taken as 0.3 kN/cm2 normal to the grain. |
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Following table shows determination of MSL from breaking strength |
| Material | MSL |
| shackles, rings, deckeyes, turnbuckles of mild steel | 50% of breaking strength |
| fibre rope | 33% of breaking strength |
| web lashing | 50% 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 | 50% of breaking strength |
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For particular securing devices (e.g. fibre straps with tensioners or special equipment for securing containers), a permissible working load may be prescribed and marked by authority. This should be taken as the MSL. |
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When the components of a lashing device are connected in series (for
example, a wire to a shackle to a deckeye), the minimum MSL in the series
shall apply to that device. |
Source: CSS code, Annex-13, sec-4.