different DWP. For example, the main hoisting machinery and the auxiliary hoisting machinery
can have a different design working period. The DWP is the period in which the equipment can
be operated safely, as long as the use and maintenance of the equipment has been in line with
the original expectations.
• A: Design working period (DWP)
• B: Predicted general overhaul (PGO)
• C: Actual general overhaul (AGO)
• T: Time
In practice, the lifetime of the equipment can vary as a result of changes in the environment and
use of the equipment. For safety reasons and according to the ISO 12482-1, it is important to
check the equipment duty class periodically and the operating conditions regularly for any
changes. The checks must be done by authorized service personnel, who can revise the
remaining DWP % 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 (GO) must be
conducted.
The hoist service organization assesses the hoisting machinery DWP, but the following table
briefly describes how it is done.
Record type
Method
Hour counter and log book
The remaining DWP % must be calculated in accordance with
the ISO 12482-1 standard. For instructions, see chapter DWP
calculation.
Log book
No log book
Design working period (DWP) calculation
The end of the design working period (DWP) must be calculated in accordance with the ISO
12482-1 standard during each recurring inspection and service. If the component does not have
a condition monitoring unit, use the following method to calculate the remaining DWP %.
NOTE
The values used in each DWP calculation, and the result and the date, must be carefully
recorded in the log book. Each DWP calculation requires the use of figures that are
recorded during previous calculations.
Step 1: Calculate the motor operating hours (running hours) for each inspection interval,
T
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OWNER’S MANUAL
This document and the information contained herein, is the exclusive property of Verlinde S.A.S and represents a non-
public, confidential and proprietary trade secret that may not be reproduced, disclosed to third parties, altered or
otherwise employed in any manner whatsoever without the express written consent of Verlinde S.A.S. Copyright 2020
© Verlinde S.A.S. All rights reserved.
6/2020
