Norsk Standard MFM

NS-EN 474-1 :2006+A3:2013

EN 474-1:2006+A3:2013 (E)

E.S Additional requirements for attachable hooks used as lifting device(s)

E.5.1 Safety latch

Attachable hooks shall be provided with a safety latch, unless unintentional displacement of the sling or load from the hook is prevented by other construction means (see Figure E.3). Damage of the safety latch due to disadvantageous location of the hook shall be avoided. If a safety latch is used it shall meet the requirements of 5.6 of EN 1677-2:2000.

Key 1 safety latch

Figure E.3- Safety latch

E.5.2 Design and strength

E.5.2.1 Attachable hooks The attachable hook shall be designed 15> and tested (5I to withstand at the different positions of the attachment (working tool) or equipment the kind of stresses described below:

4 times of the RLL at direction of the vertical load (see Figure E.4.a), a deformation is acceptable, but the """"' load shall remain supported;

2,5 times of the RLL perpendicular to the direction of the vertical load (see Figure EA. b), a deformation is acceptable, but the load shall remain supported; 1,5 times of the RLL side-load (see Figure E.4.c) without visible deformations after completion of the test. :1:::

E.5.2.2 Bolted hooks

For a bolted attachable hook the:

bolt dimensions;

bolt quality (e.g. 8.8);

holes at the intermediate plate and the

distance of the bore holes

(f)

shall be so designed that the requirements according to E.5.2.1 can be fulfilled.

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