Coefficient of utilisation (factor of safety)

• Pages: 202-203

E. Coefficient of utilisation

(factor of safety)

E.1. Wire rope'

E.1.l. For a wire rope used in the construction of a sling or

forming part of a derrick, derrick crane or crane on board ship, the

coefficient of utilisation should be

In the case of a wire rope forming part of a sling

Safe working load Coefficient

of the sling (SWL)2

Up to and including 10 tonnes 5

Over 10 tonnes up to and including

160 tonnes

'See section 9.2.

21n the case of multi-legged slings this is the safe working load of the

complete sling.

202

(8.85 x SWL) + 1910

Over 160 tonnes 3

In the case of a wire rope forming an integral part of a derrick, etc.

Safe working load of the derrick, Coefficient

derrick crane, etc. (SWL)

Up to and including 160 tonnes iO

(8.85 x SWL) + 1910

Over 160 tonnes 3

E.1.2. For a wire rope forming part of a crane other than on

board ship, the coefficient of utilisation should be

calculated according to the formula given in subparagraph

E.l.l(a); or

as given in a recognised national or international standard to

which the appliance has been designed and constructed.