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|  MIL-P-18547A(SHIPS)
NATIONAL BUREAU OF STANDARDS
Handbook H28 - Screw-Thread Standards for Federal Services.
(Application for copies should be addressed to the Superintendent of Documents, Washington 25, D. C.)
(Technical society and technical association specifications and standards are generally available for ref-
erence from libraries. They are also distributed among technical groups and using Federal agencies,)
3. REQUIREMENTS
3.1 Qualification. - Class O-1 pumps furnished under this specification shall be products which have been
tested, and passed the qualification tests specified herein, and have been listed or approved for listing on the
applicable qualified products list.
3.2 Preproduction model.- Prior to beginning production a preproduction model of a class O-l pump
shall be tested as specified in 4.6.
3.3 Materials not applicable to class CO-1 pumps. -
3.3.1 For the materials of construction of major parts of pumps covered by this specification, see table It
of 6.2. This table lists a number of materials which are considered adequate for the applications, and the table
should be followed; however this specification is not intended to be restrictive provided proposed alternate ma-
terials will give equal or better service, and Bureau of Ships approval is obtained prior to offering equipment
in response to invitations for bids. Manufacturers are urged to make use of class C drawings (basic design
drawings) to obtain approval of any desired alternate materials (see 3.8.2.3).
3.4 General design. -
3.4.1 The principle of reliability is paramount and no compromise of this principle shall be made with any
other basic requirements of design. Pumps shall be designed to operate for 40,000 hours over a period of
twenty years with a minimum of servicing. The pumps shall operate the first 9000 hours without replacement
of any parts except packing. Where wear or erosion is unavoidable, the parts subjected to such wear or ero -
ion shall be of the best materials available for the purpose in order to reduce these detrimental effects to a
inimum. The design and construction of all pumps shall be the most compact consistent with the following
requirements:
(a) Reliability.
(b) Accessibility for repair.
(c) Resistance to wear or corrosion.
(d) Economy.
(e) Unless otherwise specified in the contract or order, satisfactory operation when inclined as
follows:
Surface ships. -
(1) Up to 15 degrees from the normal horizontal position in any direction (permanently in-
clined).
(2) With the ship rolling up to 45 degrees from the vertical to either side.
(3) With the ship pitching 10 degrees up and down from the normal horizontal plane.
Submarines:
Trim (permanent)
30 degrees
Pitching
10 degrees
4 seconds
Time of complete pitch cycle
List (permanent)
15 degrees
60 degrees
Rolling
Time of complete roll cycle
8 seconds
Note 1 - Degrees indicated are measured from the vertical to either side for list and roil, and from the
normal horizontal plane up or down for trim and pitch.
Note 2 - Horizontal pumps shall be suitable for installation either fore and aft or athwartship.
3
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