MODE V6 - Step 2: Calculate the actual load spectrum factor per inspection interval, Kmi

7/2015
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Load %
Lifting time %
Factor k
3
Load spectrum factor
100%
*
1
=
80%
*
0.51
=
60%
*
0.22
=
40%
*
0.06
=
20%
*
0.01
=
0%
*
0
=
Total:
100%
*
Sum:
Divide by 100:
Sum /100 =
Load spectrum factor, K
mi
:
2. The sum of the figures in the “Lifting time %” column must always be 100.
3. Multiply each entry in the “Lifting time %” column by the multiplier in the “Factor k3” column.
Write the results in the “Load spectrum factor” column.
4. Add up the numbers in the “Load spectrum factor^ column and record the result of this sum.
5. Divide the sum of the “Load spectrum factor*，column by 100 to get the K
mi
For example, if we use: 100% load for 10% of the time, 40% load for 30% of the time and 20%
load for 60% of the time:
Step 3: Calculate the partial duration of service, S
i
Use T
i
and K
mi
in the following formula to calculate S
i
[hours]
Select the value of X, from the table below.。
Si=X* K
mi
*T
i
Product
Value of X
With counter and log book
1.2
With log book
1.4
Without counter, log book or CMS
1.5
Record the value of S, in the log book. This value will be needed for future SWP calculations.
For example, if we use: X=1.2, K
mi
=0.124 and T
i
=1440:
Si=1.2*0.124*1440=214.272
Step 4: Calculate the actual duration of service, S
Add together each of the S/ partial duration of service values gathered from this and previous
inspection intervals since the start of the safe working period.
The earlier S values (S
1
…S
i
) can be read from the log book.
S=S
1
+S
2
+…+S
i