MIL-P-24475 (SHIPS)
3. 2.1.1 The equipment shall be designed for maximum repair access ibility, for ease of
examination of wearing parts and for simplicity of disassembly and proper reassembly.
Positioning and alignment of parts in assembly shall employ positive means such as shoul-
ders , tongue and groove or other locating techniques whereby correct reassembly is repeat-
edly 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 comprosmising performance reliability:
Lifting lugs.
(a)
Casing assembly quide pins.
(b)
Alignment and positioning dowels.
(c)
Jacking screws.
(d)
Ease of access to couplings.
(e)
Remakeable piping connections.
(f)
Piping out of the way of maintenance access.
(g)
Ease of seal cage, mechanical seal, bearing and wearing ring replacement.
(h)
Spilt casings, bearing housings, etc.
(1)
Guards over rotating, moving components.
(j)
Warning plates to prevent casualties to personnel and equipment.
(k)
Provisions for connecting instruments for performance evaluation.
(1)
Attached instruments for monitoring performance.
(m)
Visibility and access to attached instruments.
(n)
Thoroughness of operating instructions.
(o)
Thoroughness of preventive maintenance instructions.
(p)
Explicit assembly and disassembly instructions.
(q)
Exploded views of critical assemblies.
(r)
Adequate system diagrams.
(s)
3.2.1.2 Each pump shall be designed to have a servi\ce 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 pumps. It shall be assumed that during the life of the pumps, parts subject
to unavoidable wear and deterioration (with the exception of seals) will be replaced at
intervals not shorter than three years. The parts subject to wear, deterioration and nor-
mally requiring replacement at three year intervals during the service life of the pumps
(with the exception of seals) shall be designed for a life of 10,000 actual operating hours
pumping sewage and they shall be identified in the appropriate drawings and manuals. The
requirements set forth above shall not be construed or interpreted as a warranty requirement
nor otherwise affect the manufacturer's warranty.
3.2.2 Mounting.
3.2.2.1 Pump units shall be horizontal or vertical mounted, as specified (see 6.1) .
3.2.2.2 Unless otherwise specified in the contract or order, each horizontal flexible
or ridid-coupled pump and separate driving unit, complete with all appurtenances, shall be
mounted on a common bedplate.
3.2.2.3 Bedplates shall be of cast steel, or of structural steel fabricated by welding.
3.2.2.4 Bedplates shall be sufficiently rigid to permit handling. shipment, and
installation of the units onboard ship, to minimize misalignment of the assembled units;
and such that the normal distortion, weaving or vibration of the supporting structures
onboard ships cannot cause misalignment between the pumps and driving units. The driver
shall be doweled and the unit realigned by the installing activity after final installation.
The manufacturer shall furnish a warning plate indicating the above.
3.2.2.5 All bearing and seating surfaces of bedplates shall be finish machined.
3.2.2.6 Each component part of an assembled flexible coupled unit supported directly
by a bedplate shall be doweled thereto to facilitate reassembly and maintenance of alignment
except that final doweling of the driver shall be performed by the installing activity
after final installation.
3.2.2.7 In the event special bulkhead mounting is required, sideplates shall be
furnished subject to all conditions specified for bedplates (see 3.2.2.3 through 3.2.2.6).
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