GWO Basic Safety Training Online Partial Refresher

BSTR-P – V01 Annex 2 Equipment list

Note: The European Standard for slings specifies safety requirements and test methods for slings used for mountaineering (slings are used as anchor points and since there are no industrial standard for slings, they must also comply with the requirements in EN795 type B, anchor devices)

** Note:

The height of the anchor points shall ensure that in the event of a fall there will be enough space below the anchor point to allow the shock absorber in a fixed length fall arrest lanyard to fully deploy whilst preventing the person who is falling from coming into contact with the ground or structure below the anchor point. The GWO recommends an anchor point height of 6.75 m (22.15 ’) for the evacuation exercises.

The recommended height is based upon the following formula,

𝑅𝐷 = 𝐿𝐿 + 𝐷𝐷 + 𝐻𝐻 + 𝐶,

Where,

𝑅𝐷 = Required Fall Distance Clearance (minimum anchor point height) 𝐿𝐿 = Length of Lanyard 𝐷𝐷 = Deceleration Distance (fall distance) 𝐻𝐻 = Height of Suspended Worker 𝐶 = Safety Factor

The value for 𝐻𝐻 is the length of the suspended worker after a fall and includes factors like the height of the person and harness stretch, to account for these variables this is set to 2.00 m. Using the value for 𝐻𝐻 (2.00 𝑚) , the maximum allowed values for 𝐿𝐿 (2.00 𝑚) & 𝐷𝐷 (1.75 𝑚), and the minimum allowed value for 𝐶 (1.00 𝑚), we get,

𝑅𝐷 = 𝐿𝐿 + 𝐷𝐷 + 𝐻𝐻 + 𝐶

and,

𝑅𝐷 = 2.00 𝑚 + 1.75 𝑚 + 2.00 𝑚 + 1.00 𝑚,

therefore,

𝑅𝐷 = 6.75 𝑚.

Therefore, the GWO recommends that the anchor points used during the evacuation exercises are placed a minimum of 6.75 m (22.15’) above the ground or any structure which a person may come into contact with, in the event of a fall.

Global Wind Organisation

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