soft skill tugas 2 ( maintenance costing )

Tugas 2 - Perawatan Mesin
Tanggal : 4 April 2017
Materi : ( Maintenance Costing ) / Biaya Pemeliharaan           3IC09
tekper2017@gmail.com
Kerjakanlah soal – soal maintenance costing berikut ini !!
        To Calculate the mean time to repair (MTTR ) ?
        Eight Subsytem : a, b, c, d, e, f, g, h form an electronic system.
        The constants failure rates of these subsystems are :
a = 0.002 , b = 0.004 , c = 0.006 , d = 0.008 , e = 0.010 , f =
0.012 , g = 0.014 , h = 0.016 failures per hour.
        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.

        Data historical of machine in industry :
        Hour ( 0 to 200) = up-time
        Hour ( 200 to 210 ) = down-time
        Hour ( 210 to 400 ) = up-time
        Hour ( 400 to 415) = down-time
        Hour ( 415 to 590 ) = up-time
        Hour ( 590 to 600 ) = down-time
        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.

        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.

        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 )?

        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

b. = 3500 x 40 x 6,67
                            178,75
    = 933800
        178,75                      =5224,06


3. MANUFACTURER A SYSTEM

MCA=2000x3=$6000