MIL-DTL- 24784/11C(NAVY)
h.
Section III - Maintenance. This section shall be further subdivided into the three units described below:
(1) Unit 1 - Principles of maintenance. This unit shall cover and discuss the importance proper
maintenance has in retaining system and independent auxiliary machinery plant capability; discuss
items which are generally applicable to a wide range of maintenance operations, such as cleanliness,
lubrication, and isolation criteria; reference sources of additional maintenance information; provide
general precautions for performing maintenance; and shall define and briefly discuss maintenance
instructions and maintenance procedures.
(2) Unit 2 - Maintenance instructions. This unit shall provide specific maintenance instructions for
system-independent subsystems and independent auxiliary machinery plant. Each instruction shall
have breakdowns on general information, precautions, preventive maintenance, troubleshooting and
corrective maintenance. A preventive maintenance summary table shall be provided for each
instruction. Preventive maintenance instructions shall be retained in this unit until formal
implementation of the 3-M Planned Maintenance System.
(3) Unit 3 - Maintenance procedures. This unit shall contain maintenance operations of a general nature,
such as hydrostatic testing, component handling, routinely performed tests, and adjustment procedures
for special system cleaning and preventative maintenance operations.
3.8.3 Volume 3 - power and lighting systems. This volume shall consist of two parts.
3.8.3.1 Part 1 - general description and design information of systems. The following shall be a guide for
format and applicable subject matter:
a.
Generating plant - A description shall be given, including tables and illustrations included where necessary,
of ship service, emergency, and special systems:
(1) Type, size, and location of generators.
(2) Temperature rises to be expected at various points in the generator during normal operation, and
methods of measuring temperature by use of the thermocouples in the stator of the generator.
(3) Use of space heaters within the generator during periods of shutdown.
(4) Type of voltage regulator, method of regulation, and degree of voltage regulation.
(5) Prime mover information, including kind, rating, speed, reduction gear data, and manufacturer.
(6) Type of governor and method of regulation, degree of frequency regulation, and generator load
balancing features.
(7) Overload and unbalance ratings of the generators, including the short time overload ratings and
special overload requirements, if any, the allowable phase unbalance for three-phase generators, and
allowable unbalance for three-wire, dc generators.
(8) Brief power analysis to show what loads may be expected during various conditions of operation
including the event of loss of part of the generating capacity.
(9) Instructions for operating the system under split plant or parallel conditions, proper bus tie
connections for the various shipboard conditions, and the number of ship service generators which
may be operated safely in parallel without exceeding the interrupting capacity of the circuit breakers
shall be specified. A note shall be added that this should not limit the number of ship service
generators, which may be paralleled momentarily for transfer of load or synchronizing. It is not
intended that detail instructions be included for the operation of the generator itself such as method of
starting, controlling, and paralleling.
b.
Distribution system - A description shall be given and illustrations included, where specified, for ship's
service emergency, special, power and lighting systems.
c.
Type of distribution:
(1) A statement of the method of distributing the electric power, covering for example, that the system is
of the radial type, consisting of switchboards, load centers and power panels, bus ties, feeders, mains,
and submains.
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