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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.
i
mi
i
T
K
X
S
=
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
i
in the log book. This value will be needed for the future DWP calculations.
For example
, if we use:
X
=1.2,
K
mi
=0.124 and
T
i
=1440:
272
.
214
1440
124
.
0
2
.
1
=
=
i
S
Step 4: Calculate the actual duration of service,
S
Add together each of the
S
i
partial duration of service values gathered from this and previous inspection intervals
since the start of the designed working period.
The earlier S values (
S
1
…S
i
) can be read from the log book.
i
S
S
S
S
+
+
+
=
...
2
1
For example
, if we use
S
1
= 215.468,
S
2
= 210.26,
S
3
(S
i
)
= 214.272:
640
272
.
214
26
.
210
468
.
215
=
+
+
=
S
