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|  MIL-P-17639F(SH)
3.
REQUIREMENTS
3.1 First article. When specified in the contract or purchase order, a
sample shall be subjected to first article inspection (see 4.3 and 6.3). On
board repair parts and stocked spare parts ordered for pumps built to this
specification shall be subject to the same tests as the original equipment.
3.2 General design. The design and construction of pumps shall comply with
the space and weight requirements as specified (see 6.2.1). The pump unit shall
perform under the list, pitch, roll and trim conditions as specified (see 6.2.1).
Pumps shall operate continuously at any point over the entire flow range and the
design conditions as specified (see 6.2.1).
3.2.1 Reliability. The requirements of this specification are imposed
exclusively to obtain equipment of utmost reliability for the service intended.
The assurance of maximum reliability shall be the paramount controlling principle
in the design, fabrication, assembly, and testing of this equipment. Users of,
and contractors to, this specification are urged to communicate to NAVSEA any
findings related to the requirements or lack of requirements of this specifica-
tion whereby improvement of equipment reliability can be achieved. On board
repair parts and stocked spare parts ordered for pumps built to this specifica-
tion shall be subject to the same tests as the original equipment.
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 relate to those shipboard environmental and
service conditions, and they shall be fully considered in the pump design.
The aspects of "human engineering" shall also 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:
(a)
Lifting lugs.
(b)
Casing assembly guide pins.
(c)
Alinement and positioning dowels.
(d)
Jacking screws.
(e)
Ease of access to couplings.
(f)
Re-makeable piping connections.
6
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