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|  MIL-P-171381D(SHIPS)
Where:
Ns = specific speed at the best efficiency point.
(2) Effects of thrust reversal where conditions which might cause thrust
reversal exist.
(3) Effects of roll, pitch, list and trim of the ship (including gyroscopic
effects) shall be considered in the bearing design.
(4) Bearing clearance ratios, L/D ratio and characteristic numbers, lubrica-
tion flow and temperature rise (water lubricated bearings).
(S) Minimum film thickness required and calculated under maximum radial and
axial load conditions over the range of specified pump operating
conditions (water lubricated bearings).
(c) Analysis of driver bearings for close-coupled or rigidly coupled units.
(d) Calculation of the worst case cumulative effect of dimensions and tolerances
for parts and locations. These calculations shall demonstrate:
(1) There will be no interference between rotating and stationary parts
as assembled.
(2) There will be no interference between rotating and stationary parts, and
hence no reduction in life of wearing parts, when these worst case
cumulative effects are combined with operational environmental, and
thermal loading.
#
3.12 Design record. A design record when required (see 6.1) shall be submitted to the
design review agency. This record shall be completed except as noted in 3.12.2, and for-
warded prior to unit delivery or at a time agreed to by the design review agency concerned.
3.12.1 The design record shall contain the following:
(a) The design data and calculations which were-submitted for manufacturing
release, except as modified to resolve comments at time of manufacturing
.
release.
(b) Revised calculations in those areas of design where the original calculations
must be modified as a result of an approved design change.
(c) Approved design l valuation test reports, including resolution of comments
in the approval action and any special testing which may be performed to
verify new design features.
3.12.2 Changes in pump design approved subsequent to issue of the design record, or
approved deviations in the design evaluation test unit from the design described in the
design record, shall be submitted as an addendum to the design record. The addendum shall
include applicable revised drawings.
4.
QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for ins ction. Unless otherwise specified in the contract or
purchase order, the supplier is responsible for the performance of all inspection require-
ments as specified herein. Except as otherwise specified in the contract or order, the
supplier may use his own or any other facilities suitable for the performance of the inspec-
tion requirements specified herein, unless disapproved by the Government. The Government
reserves the right to perform any of the inspections set forth in the specification where
such inspections are deemed necessary to assure supplies and services conform to prescribed
requirements.
4.1.1 The inspection requirements shall consist of the following:
#
(a) Completed part examination (see 4.1.2),
(b) Qualification (see 4.2).
(c) Tests (see 4.3).
(1) Shop tests. TO be conducted on each pump supplied under the contract
or order (see 4.3.1).
(2) Performance l valuation tests. To be conducted on one pump of each type,
design and size on each contract or order (ace 4.3.2).
(3) Design evaluation tests. To be conducted on one pump of each type,
size (see 4.3.3).
#
" The inspection system which the supplier is required to main-
tain, as provided in inspection clause of the contract or order, shall be in accordance
with MIL-I-45208 (see 6.1 and 6.2).
17
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