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|  MIL-P-17840C(SH)
(Application for copies should be addressed to the American Society for
Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.)
HYDRAULIC INSTITUTE
Test Code of Standards - Centrifugal Pump Section.
(Application for copies should be addressed to Hydraulic Institute, 712
Lakewood Center N., 14600 Detroit Avenue, Cleveland, OH 44107.)
(Nongovernment standards and other publications are normally available
from the organizations which prepare or which distribute the documents. These
documents also may be available in or through libraries or other informational
services.)
2.3 Order of precedence. In the event of a conflict between the text of
this specification and the references cited herein (except for associated detail
specifications , specification sheets or MS standards), the text of this specifi-
cation shall take precedence. Nothing in this specification, however, shall
supersede applicable laws and regulations unless a specific exemption has been
obtained.
REQUIREMENTS
3.
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).
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 in MIL-STD-1399, section 301. 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.
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.
4
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