The maintenance department of an Oil and Gas Company has 6 large drilling equipment waiting for repairs.
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Question:
The maintenance department of an Oil and Gas Company has 6 large drilling equipment waiting for repairs. These are labelled A, B, C, D, E and F. The respective repair times (in days) and the remaining days before the due date are given in the table below.
Equipment | Time required | Due (at the end of) day |
A | 1 | 30 |
B | 8 | 27 |
C | 3 | 38 |
D | 27 | 57 |
E | 2 | 29 |
F | 29 | 42 |
[15 Marks]
- What will be the job sequences using (1) CR and (2) SPT rules?
- What will be the (1) average flow time, (2) average days late, and 3) average work in progress for the CR and SPT sequences?
- Apply the appropriate method to determine the sequence which will minimize the total number of late jobs.
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