The majority of hand chain blocks are purchased without provision for storing slack chain, so that when the load hook is in a raised position, the slack chain hangs freely from the block forming a loop. In some applications this can present a hazard, with the risk of the slack chain becoming caught on obstructions or itself becoming a hazard to persons. A condition can also occur where the brake is held open by the weight of the slack chain. Hoist UK offer a ‘chain bag’ which serves as a collecting bag to house the slack chain thereby minimising the risks.
If a 'chain bag' or other chain collection box is to be used, consideration must be made for:
To determine lift you will need to know two critical pieces of information. First, where will your chain block hang from; and secondly where will the load to be picked be located in relation to the chain hoist. Finding your lift number will be nothing more than subtracting the resting location of the item to be picked from the hanging location of the hoist.
For example, if your item to be picked is located on the factory floor, and the beam the chain block sits on is at a height of 30m, then you will need at least 30m of chain lift with your new block. When in doubt, always add a couple metres of metres to be safe; chain is sold per metre and it can not be added to the existing chain.
For example, if it turns out you will need 7m of lift, you will have to order a completely new chain which can cost hundreds of dollars; if you had added 1 extra metre to your lift before ordering your chain block, the difference would probably be within $25 – $50 per metre. It’s a costly mistake that can easily be avoided.
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