How do we calculate Reduced Safe Working Load (RSWL)?

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Multiple Choice

How do we calculate Reduced Safe Working Load (RSWL)?

RSWL is the capacity you can safely use after accounting for the loss of strength from knots or splices. The way this is handled is to scale the baseline Safe Working Load by the knot or splice’s efficiency factor. Since the efficiency is a fraction less than 1, multiplying SWL by this efficiency reduces the allowable load to reflect the weakening caused by the knot or splice. If the efficiency were 1 (no loss), RSWL would equal SWL; as the efficiency drops, the RSWL drops accordingly. For example, if the Safe Working Load is 10,000 pounds and the knot/splice efficiency is 0.75, the Reduced Safe Working Load would be 7,500 pounds. Multiplication captures the proportional reduction that a knot or splice introduces. Dividing, adding, or subtracting would not correctly represent how strength is affected by the knot or splice, which is inherently a percentage-based reduction of the original capacity.

RSWL is the capacity you can safely use after accounting for the loss of strength from knots or splices. The way this is handled is to scale the baseline Safe Working Load by the knot or splice’s efficiency factor. Since the efficiency is a fraction less than 1, multiplying SWL by this efficiency reduces the allowable load to reflect the weakening caused by the knot or splice. If the efficiency were 1 (no loss), RSWL would equal SWL; as the efficiency drops, the RSWL drops accordingly.

For example, if the Safe Working Load is 10,000 pounds and the knot/splice efficiency is 0.75, the Reduced Safe Working Load would be 7,500 pounds. Multiplication captures the proportional reduction that a knot or splice introduces.

Dividing, adding, or subtracting would not correctly represent how strength is affected by the knot or splice, which is inherently a percentage-based reduction of the original capacity.

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