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8.6 Approaching Theoretical Calculated Lifetime
8.6.1 Special Assessment
A special assessment is a thorough examination and evaluation of the product carried out by
authorized service personnel or experienced service man authorized by the manufacturer or
manufacturer’s representative in accordance with the ISO 12482-1 standard. It is done when
the product approaches the end of each SWP, typically when 20% of the SWP remains. Any
general overhaul requirements stated in the special assessment report must be carried out
before further use of the product.
8.6.2 General Overhaul
When the Safe Working Period (SWP) of the hoist is exhausted, the
hoist may only be used after a GO has been conducted. Usage of a
defective hoist can result in serious damage, injury or death.
SWP= Safe Working Period
GO = General Overhaul
T = Time
Once the SWP% of the hoisting machinery reaches zero, the hoisting machinery has
exhausted its theoretical lifetime. The probability of a defect in the product is therefore
higher and operating safety is jeopardized. At the end of the SWP, a thorough General
Overhaul (GO) must be conducted. Afterwards the product will then be assigned a new
SWP, provided that it is safe to continue operation. At the start of each period the SWP
is 100% and, at the end, the SWP is 0%.
Only authorized service personnel or an experienced service man authorized by the
manufacturer or manufacturer’s representative may conduct a GO. The components
that have an impact on product’s lifetime are inspected and critical components are
replaced. A new theoretical SWP is given after completion of a GO. The same hoisting
machinery can undergo no more than two GOs before it must be completely replaced
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