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|  MIL-C-18087A(SH)
(c) Any other speed or exciting frequency cited in the contract or
order (see 6.2)
3.3.1.2 Collaboration. The clutch contractor shall collaborate with the
driven or driving machinery contractors, as applicable, to assure that construc-
tion, installation, and operating requirements are identical and mutually
acceptable (see 6.2).
3.3.1.3 Life endurance). Clutches shall be designed for 30-year life, when
life requirement is not stated. When life required for the parent equipment (see
6.2) is other than 30 years, clutches shall be designed for the same life. Where
different life is indicated for associated equipment, clutches shall be designed
for the greater life requirement. Required operating hours for clutches shall be
equal to the greater value required for driver or driven equipment (see 6.2). The
clutch shall also be designed to meet the expected number of engagements and
disengagements at various power levels (see 6.2).
3.3.1.3,1 Operating hours, propulsion clutches, steam turbine powered units
and all propel ler shaft sp eed applications.
Clutch life in operating hours shall be as follows:
(a)
Total hours - 150,000.
(b)
Full power hours - 15,000,
(c)
Between 50 and 100 percent full power hours - 60,000.
(d)
Less than 50 percent full power hours - 75,000.
3.3.1.3.2 Operati ng hours. propulsion clutches. gas turbin e and diesel
powered uni ts, in termediat e and high speed appl ications.
Clutch life in operating hours shall be as follows:
(a)
Total hours - 150,000.
(b)
Full power hours - 75,000.
(c)
Between 50 and 100 percent full power hours - 37,500.
(d)
Less than 50 percent full power hours - 37,500.
3.3.1.3.3 Operating hours. auxiliary cl utches.
Auxiliary clutch life shall
be 100,000 hours at design rated conditions.
3.3.1.4 Over torque. Clutches shall transmit 200 percent of rated torque at
the maximum specified misalignment (see 6.2) for a minimum period of 1 minute
for each occurrence. Contracting activity shall specify number and frequency of
occurrences (see 6.2).
Maintenance.
3.3.2
3.3.2.1 Acce ssibility. Design shall, within space limitations, provide the
maximum accessibility to parts which require routine inspection, maintenance, and
repairs. Design shall provide for minimum effort required to accomplish planned
maintenance actions and to effect repairs.
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