Lifting Operations and Lifting Equipment Regulations 1998 and pulley systems and forklift trucks. The regulations apply to all workplaces and all the provisions of the 'Provision and Use of Work Equipment Regulations 1998' also apply to lifting equipment. A safe working load (SWL) should, according to the regulations be marked onto lifting equipment with the relevant SWL being dependent on the configuration of the equipment, accessories for lifting such as eye bolts, lifting magnets and lifting beams should also be marked. The load itself would be based on the maximum load that the equipment can lift safely. Lifting equipment that is designed for lifting people must also
Block and tackle more precise estimate of efficiency is possible by use of the sheave friction factor, formula_12 (which may be obtainable from the manufacturer or published tables). The relevant equation is: Typical formula_12 values are 1.04 for roller bearing sheaves and 1.09 for plain bearing sheaves (with wire rope). The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary to pull 6 metres of rope through the