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Vacuum Pumps, Power Driven, Centrifugal Pump Priming Service, Naval Shipboard
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Vacuum Pumps, Power Driven, Centrifugal Pump Priming Service, Naval Shipboard
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General design



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MIL-V-18683A(SHIPS)
STANDARDS
MILITARY
MIL-STD-278 - Fabrication, Welding, and Inspection of Machinery, Piping, and Pressure Vessels
for Ships of the United States Navy.
MIL-STD-438 - Schedule of Piping, Valves, Fittings, and Associated Piping Components for Sub-
marine Service,
MIL-STD-777 - Schedule of Piping, Valves, Fittings, and Associated Piping Components for Surface
ships .
DRAWING
MILITARY
B-153 - Packings and Gaskets, Standard Application of.
(Copies of specifications, standards, drawings, and publications required by suppliers in connection with
specific procurement functions should be obtained from the procuring activity or as directed by the contracting
officer.)
2.2 Other publications.  The following documents form a part of this specification to the extent specified
herein, Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal
shall apply.
NATIONAL BUREAU OF STANDARDS
Handbook H28 - Screw-Thread Standards for Federal Services.
(Application for copies should be addressed to the Superintendent of Documents, Government Printing Office
Washington, D. C. 20402).
UNIFORM CLASSIFICATION COMMITTEE
Uniform Freight Classification Rules,
(Application for copies should be addressed to the Uniform Classification Committee, 202 Union Station,
516 West Jackson Boulevard, Chicago, Illinois 60606),
3. REQUIREMENTS
3.1  Qualification.  Power driven vacuum pumps furnished under this specification shall be products which
are qualified for listing on the applicable qualified products list at the time set for opening of bids (see
4.2 and 6.3).
Materials for the pump shall be in accordance with table I.
3.2 Materials.
Table I - List of materials.
#
3.2.1 Specification QQ-C-390 covers a number of alloys.  Alloys other than those shown in table I may be
#
used subject to prior approval by the Naval Ship Engineering Center (NAVSEC).
3.2.2 The use of materials differing in properties from those specified for a given application will be
considered when the supplier shows the necessity for such substitution, the material proposed is readily obtain-
able, and provided that the material is satisfactory to the command or agency concerned.
3.2.3 Where no specifications are specified herein for the material for certain parts, the material used
shall be of a type and quality consistent with that specified for associated parts in the pump. The use or sub-
stitution of manufacturers material shall be subject to approval by the command or agency concerned and shall
2

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