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| MIL-P-18682D(SH)
3.2.2 The equipment specified herein will be operated, maintained, and
repaired on board Navy ships. Attention is directed to the high equipment
density of shipboard machinery spaces, to the fact that maintenance and repair
will be made underway in heavy seas, that equipment will operate unattended,
and that maintenance personnel may not be seasoned mechanics. The requirements
for maximum reliability directly relates to those shipboard environmental and
service conditions, and they shall be fully considered in the pump design.
The aspects of "human engineering" shall be fully explored and considered in
the equipment design to minimize the possibility of failure through improper
operation and maintenance, and to preclude personnel safety hazards. In no
case shall parts be physically interchangeable or reversible unless such parts
are also interchangeable functionally and from considerations of strength.
3.2.2.1 The equipment shall have maximum repair accessibility for ease
of examination of wearing parts and for simplicity of disassembly and proper
reassembly. Positioning and alinement of parts in assembly shall employ positive
means such as shoulder, tongue, and groove or other locating techniques whereby
correct reassembly is repeatedly assured. In consonance with the concept of ease
of maintenance and where not already specified, the pump designer shall consider
all of the following features for incorporation in the design and technical
documentation wherever such incorporation will significantly contribute to ease
of maintenance without compromising performance reliability:
Lifting lugs.
(a)
Casing assembly guide pins.
(b)
Alinement and positioning dowels.
(c)
Jacking screws.
(d)
Ease of access to couplings.
(e)
(f)
Re-makeable piping connections.
Piping out of way of maintenance access.
(g)
Ease of packing, mechanical seal, bearing,
(h)
and wearing ring replacement.
(i)
Split casing, bearing housings, etc.,
(except for submarine service).
Guards for rotating and moving components.
(j)
(k)
Warning plates to prevent casualties to
equipment and personnel.
Provisions for connecting instruments for
(l)
performance evaluation.
(m)
Attached instruments for monitoring performance.
(n)
Visibility and access to attached instruments.
Thoroughness of operating instructions.
(o)
Thoroughness of preventive maintenance instructions.
(p)
Explicit assembly and disassembly instructions.
(q)
Exploded views of critical assemblies.
(r)
(s)
Adequate system diagrams.
3.2.2.2 Each pump shall have a service life of 30 years of which 40 percent
shall be actual operation. There shall be no limit on the number of starts
during the life of the pump. It shall be assumed that during the life of the
pump, parts subject to unavoidable wear and deterioration (with the exception of
packing and seals) will be replaced at intervals no shorter than 3 years. The
parts subject to wear, deterioration, and normally requiring replacement at
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