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2.5.2 Chain Hoist Machinery Safe Working Period (SWP)
Based on how the hoisting machinery will be used and on the actual hoisting machinery
hardware supplied, the manufacturer will agree the anticipated hoisting machinery lifetime or
safe working period(SWP) with the customer at the time of purchase.
The total lifetime of hoisting machinery consists of one or more Safe Working Period (SWP)
where each SWP typically lasts around ten years when the equipment is used in accordance
with the designed usage. It is possible for different hoisting machineries on the same crane, for
example main and auxiliary, to have a different SWP. The SWP is the period in which, provided
the equipment has been used and maintained in line with the original expectations, the
equipment can be safely operated.
SWP =Safe Working Period
PGO =Predicted General Overhaul
AGO =Actual General Overhaul
T =Time
In practice the lifetime of the equipment can vary due to changes in the environment and usage
of the equipment. For safety, in accordance with thelS012482-1 standard, it is important for
authorized service personnel to periodically check the equipment duty group and operating
conditions regularly for any changes, then to revise the remaining SWP% upwards or
downwards accordingly. This action ensures that the equipment is kept operating for as long as
it is safely possible before a General Overhaul must be conducted.
2.5.3 How to Assess the Hoisting Machinery Safe Working Period
The hoist service organization assesses the hoisting machinery Safe Working Period but this
table briefly describes how it is done.
Product equipped with condition
monitoring unit
The SWP value can be read form the SWP-data counter display
of the condition monitoring unit. Refer to the more detailed
instructions provided in the condition monitoring unit operating
instructions.
Product equipped with hour counter
and log book
The remaining SWP% must be calculated in accordance with
thelS012482-1 standard, using the
formula presented in the “APPENDIX: Safe working
period(SWP) Calculation”.
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