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|  MIL-P-17840C(SH)
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
Positioning and alignment of parts in assembly shall employ posi-
reassembly.
tive means such as shoulder, tongue and groove, or other locating techniques
whereby correct reassembly is repeatedly assured. In consonance with the con-
cept 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)
Alignment and positioning dowels.
(c)
Jacking screws.
(d)
Ease of access to coupling.
(e)
(f)
Re-makeable piping connections.
(g)
Piping out of way of maintenance access.
(h)
Ease of packing, mechanical seal, bearing, and wearing ring
replacement.
(i)
Split casing, bearing housings, and so forth.
Guards for rotating and moving components.
(j)
Warning plates to prevent casualties to equipment and personnel.
(k)
Provisions for connecting instruments for performance evaluation.
(l)
Attached instruments for monitoring performance.
(m)
Visibility and access to attached instruments.
(n)
(o)
Thoroughness of operating instructions.
Thoroughness of preventive maintenance instructions.
(p)
Explicit assembly and disassembly instructions.
(q)
Exploded views of critical assemblies.
(r)
Adequate system diagrams.
(s)
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 3-year intervals during the service life of the pump (with the
exception of packing and seals) shall have a life of 10,000 actual operating
hours , and they shall be identified in appropriate drawings and manuals. The
requirement set forth above shall not be construed or interpreted as a warranty
requirement, nor otherwise affect the manufacturer's warranty.
3.2.2.3 Maintainability. The time to perform pump maintenance action
requiring part removal shall not exceed 3 hours.
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