Tanggal : 4 April 2017
Materi : ( Maintenance Costing ) /
Biaya Pemeliharaan
Doni Indra D – 23414241 – 3IC09
1. To
Calculate the mean time to repair (MTTR ) ?
a. Eight
Subsytem : a, b, c, d, e, f, g, h form an electronic system.
b. The
constants failure rates of these subsystems are :
la = 0.002 ,lb = 0.004 , lc = 0.006 , ld = 0.008 , le = 0.010 , lf = 0.012 , lg = 0.014 , lh = 0.016 failures per hour.
c. The
corresponding estimate corrective maintenance time are :
Ta
= 2 hour, Tb = 3 hour, Tc = 4 hour, Td =
5 hour, Te = 6 hour, Tf = 7 hour, Tg = 8 hour, Th = 9 hour.
2. Data
historical of machine in industry :
a. Hour
( 0 to 200) = up-time
b. Hour
( 200 to 210 ) = down-time
c. Hour
( 210 to 400 ) = up-time
d. Hour
( 400 to 415) = down-time
e. Hour
( 415 to 590 ) = up-time
f. Hour
( 590 to 600 ) = down-time
g. Hour
(600 to 750 ) = up-time
To
calculate of :
·
the mean time to between failure (MTBF )
and mean downtime (MDT) ?
·
the annual labor cost of corrective
maintenance (CMal) ?
Whereas
: SOH = 3500 hour, MTTR = 30 h, LCH = $ 40.
3. Maintenance
Cost-Related Data :
|
Description
|
Manufacture
A system
|
Manufacture
B system
|
Manufacture
C System
|
|
Expected
Life
|
15 years
|
15 years
|
15 years
|
|
Expected
cost of a corrective maintenance
action
|
$2000
|
$2500
|
$3500
|
|
Annual
failure rate
|
3 failures per year
|
3.5 failures per year
|
2.5 failures per year
|
|
Annual
interest rate
|
4 %
|
4 %
|
4 %
|
Determine
which of the three system will be less costly with present value of corrective
maintenance ( Find the value of (PV)?
NB
: Using the Formula II.
4. Assume
that we have the following time estimates to accomplish an activity :
OT
= 85 days
PT
= 105 days
MT
= 90 days
To
Calculate the activity expected duration time
( Ta )?
5. Assume
that in maintenance organization we have the following data :
TAH
= 2500 hour
BR
= 0.2
LR
= $25
N = 50
To
Calculate the cost per employee (Cem)and The total labor cost ( TLC
)?
Jawaban :
1. 4x10-3 + 0,012 + 0,024 + 0,04 +
0,06 +0,084 + 0,112 + 0,144
0,072
= 0,48
0,072
= 6,67
2. a.MTBF
200 + 190 + 175 + 150
4
= 178,75
MDT
10 + 15 + 10
3
= 11,66
178,75
= 933800
178,75
= 5224,06
3.
MANUFACTURER A SYSTEM
MANUFACTURER B
SYSTEM
MANUFACTURER C
SYSTEM
4. Calculate
the activity expected duration time
5.Calculate the cost per employee (Cem)and
The total labor cost ( TLC )
