With 38 key mechanics
working 39.5 hours each, the amount of work completed
per shutdown would be nearly 1,500 shutdown hours. If 20
mechanics from other sources were borrowed, each
shutdown could provide approximately 2,300 hours of task
work. See figure 6-5 for another look at this shutdown.
Recall that linestops could
possibly move 2,400 shutdown work hours to non-shutdown
work, the annual internal shutdown work is reduced to
16,000 hours – 2,400 hours = 13,600 hours. With this
strategy, four and one-half shutdowns (at 2,300 hours
each = 10,350 shutdown hours) and ten maintenance
linestops (at 306 hours each = 3,060 shut-down hours)
would be needed to provide the approximate 13,600
shut-down hours of planned work. This plan would reduce
the annual shut-down time from 28 days to about 21 days.
