1、a h v- O a -e zs+-J DOD-B-24668(Sl-i) 27 August 1986 MILITARY SPECIFICATION BEARING UNIT, MAIN THRUST, SUBMARINE PROPULSION SYSTEM This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Depa
2、rtment of Defense. 1. SCOPE 1.1 Scope. This specification covers propulsion system thrust bearing units for naval submarines, where such units combine a hydrodynamic thrust bearing, a vibration reducer and a journal (radial) bearing in a common housing and utilize an external force-fed lubricating o
3、il system for the bearings and an external hydraulic system for the vibration reducer. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and stan- dards form a part of this specification to the extent specified herein. Unless otherwise
4、 specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement: thereto, cited in the solicitation. SPECIFICATIONS FEDERAL QQ-C-390 - Copper Alloy Castings (IncluLALig Cast Bar). QQ-T-390 - Tin A
5、lloy Ingots and Castings and Lead Alloy Ingots and Castings (Antifriction Metal) for Bearing Applications. MILITARY MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. MIL-S-1222 - Studs, Bolts, Hex Cap Screws, and Nuts. MIL-G-2697 - Glasses, Po
6、rtlight, Circular, Heat Treated. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the se
7、lf-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 3130 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited / THIS DOCUMENT CONTAINS 5 I PAGES. Provided by IHSNot for ResaleNo reproductio
8、n or networking permitted without license from IHS-,-,-MILITARY (Continued) MIL-P-2845 - Packaging of Main Propulsion Shafting, Bearings, Boat and Ship Propellers, arad Associated Repair Parts. MIL-G-2860 - Glasses, Sight-Flow, Clear, Borosilicate. MIL-S-5000 - Steel, Chrome-Nickel-Molybdenum (E4340
9、) Bars and Reforging Stock. MIL-C-5015 - Connectors, Electrical, Circular Threaded, General Specification for. MIL-S-5626 - Steel: Chrome-Molybdenum (4140) Bars, Rods, and Forging Stock (for Aircraft Applications) . MIL-R-8791 - Retainer, Packing, Hydraulic, and Pneumatic, Tetrafluoroethylene Resin.
10、 MIL-Q-9858 MIL-P-15024 MIL-P-15024/5 - Plates, Identification. MIL-S-15083 - Steel Castings. MIL-C-15345 - Castings, Nonferrous, Centrifugal. MIL-T-15377 MIL-1-17244 MIL-L-17331 - Lubricating Oil, Steam Turbine and Gear, Moderate MIL-T-17600 - Turbines, Steam, Propulsion Naval Shipboard. MLL-S-2269
11、8 - Steel Plate and Shapes, Weldable Ordinary Strength MIL-S-23284 - Steel Forgings, Carbon and Alloy, for Shafts, - Quality Control System Requirements. - Plates, Tags and Bands for Identification of Equipment . - Temperature Monitor Equipment Naval Shipboard. - Indicators, Temperature, Direct-Read
12、ing , Bimetallic, (3- and 5-inch Mal). Service. and Higher Strength: Hull Structural. Sleeves, Couplings, and Stocks (Rudders and Diving Planes) . - Steel Forgings, Carbon and Alloy Beat Treated. - Thermocouple and Resistance Temperature Assemblies, MIL-S-24093 MIL-T-24388 DOD-F-24669 - Forgings and
13、 Forging Stock, Steel Bars, Billets DOD-F-24669/1 - Forgings and Forging Stock, Steel (Carbon and MIL-R-83248 - Rubber, Fluorocarbon Elastomer, High-Temperature, General Specification for (Naval Shipboard). and Blooms, General Specification for. Alloy) Blooms, Bars, Billets and Slabs. Fluid, and Com
14、pression Set Resistant. (Metric) (Metric) STANDARDS FEDERAL FED-STD-HZ8 - Screw-Thread Standards for Federal Services . MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Inter- nally Excited). P
15、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a * a DOD-B-24bb 31 W 7779706 0105LO 2 W MILITARY (Continued) MIL-STD-167-2 - Mechanical Vibrations of Shipboard Equipment (Reciprocating Machinery and Propulsion Systan and Shafting) Types ILI, IV, and
16、V. MIL-STD-271 - Nondestructive Testing Requirements for Metals. MIL-STD-278 - Fabrication Welding and Inspection; and Casting Inspection and Repair for Machinery, Piping and Pressure Vessels in Ships of the United States Navy. tings for Hydraulic Power Transmission Equipment. ated Piping Components
17、 for Submarine Service. MIL-STD-419 - Cleaning and Protecting Piping, Tubing, and Fit- MIL-STD-438 - Schedule of Piping, Values, Fittings , and Associ- MIL-STD-882 - System Safety Program Requirements. DOD-STD-2183 - Bond Testing, Babbitt JLned Bearings. 2.1.2 Other Government documents, drawings, a
18、nd publications. The following other Government documents, drawings, and publications form a part of this specifi- cation to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. DESIGN DATA SHEETS (DDS) 072-1 - Shock Design Val
19、ues. 243-1 - Propulsion Shafting. DRAWINGS NAVAL SEA SYSTEMS COMMAND (NAVSEA) 803-2145807 - Propulsion Shafting and Components. PUBLICATIONS NAVAL SEA SYSTEMS COMMAND (NAVSEA) 0283-LP-228-1000 - Bearing Babbitting Procedures. NAVSHIPS 250-644-1 - Measurement of Bearing Reactions. SUPERVISOR OF SHIPB
20、UILDING, THIRD NAVAL DISTRICT SUPSHIP 280-8 - Shock Design Criteria for TRIDENT Submarines. (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by th
21、e contracting activity.) 2.2 Other publications. The following documents form a part of this speci- fication to the extent specified herein. Unless otherwise specified, the issues . of the documents which are DoD adopted shall be those listed in the issue of the DoDISS specified in the solicitation.
22、 Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovernment docu- ments which is current on the date of the solicitation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMERICAN NATIONAL STAN
23、DARD INSTITUTE (ANSI) Y14.36 - Surface Texture Symbols. (DoD adopted) (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 108 - Standard Specification for Steel Bars, Carbon,
24、 A 485 - Standard Specification for High Hardenability Bearing A 512 - Standard Specification for Cold-Drawn Buttweld Carbon A 513 .- Standard Specification for Electric-Resistance-Welded (DoD adopted) A 516 - Standard Specification for Pressure Vessel Plates, Carbon Cold-Finished, Standard Quality
25、. (DoD adopted) Steels . (DoD adopted) Steel Mechanical Tubing. Carbon and Alloy Steel Mechanical Tubing. Steel, for Moderate- and Lower-Temperature Service. (DoD adopted) A 519 - Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing . A 541 - Standard Specification for Steel
26、Forgings, Carbon and Alloy, Quenched aIzd Tempered, for Pressure Vessel Component s . A 576 - Standard Specification for Steel Bars, Carbon, Hot-Wrought , Special Quality. (DoD adopted) A 675 - Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Property. A 686 -
27、Standard Specification for Carbon Tool Steels. (DoD adopted) A 830 - Standard Specification for Plates, Carbon Steel, Structural Quality, Furnished to Chemical Composition Requirements. B 26 - Standard specification for Aluminum-Alloy Sand Castings. (DoD adopted) B 108 - Standard Specification for A
28、luminum-Alloy Permanent Mold Castings. (DoD adopted) B 209 - Standard Specification for Aluminum and Aiminurn-Alloy Sheet and Plate. (Metric) (DoD adopted) E 208 - Standard Method for Conducting Drop-FJeight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels. (DoD adopted) (Do
29、D adopted) (Application for copies should be addressed to the American Society or Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Nongovernment standards and other publications are normally available from the organizations which prepare or dich distribute the documents. These docu
30、ments also may be available in or through libraries or other infornational services .) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-B-2Llbb 31 W 777770b 0105110 O W DOD-B-24668(SH) 2.3 Order of precedence. In the event of a conflict between th
31、e text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifica- tion shall take precedence. Nothing in this specification, however, shall super- sede applicable laws and regulations unless a
32、 specific exemption has been obtained. 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). 3.2 Design. 3.2.1 General. The thrust bearing unit shall incorporate bearings which provide longitudi
33、nal and radial restraint for the propulsion shafting and shall contain those elements of a vibration reducer system delineated in 3.2.10.3.5. Provision shall be made on the housing to accept oil supply, return and drain lines, and for all instrumentation and control connections necessary for the ope
34、ration, control, and monitoring of the unit and the vibration reducer. Oil seals are to be provided at all housing penetrations. The design shall include features that facilitate inspections, maintenance, repairs and overhauls. 3.2.1.1 Major components. The major components are the housing, a thrust
35、 shaft with an integral thrust collar, a hydrodynamic journal bearing, pivoted ahead and astern hydrodynamic thrust shoes, mechanical or mechanical/hydraulic elements to equalize the thrust load between the shoes transmitting the thrust load, and connections to a hydraulic system of the vibration re
36、ducer system. Journal bearing shall support one end of the thrust: shaft and may provide radial support for other portions of main shafting. 3.2.1.2 Criticality. Thrust bearing unit is a critical element of the submarine propulsion plant. Bearing unit shall perform over the entire operating range of
37、 the ship as specified in 3.2.3. 3.2.2 Reliability. The principle of reliability is paramount and no com- promise of this principle shall be made with any requirement. It is intended that no part shall be replaced nor repaired during the specified design life (see 3.2.7) except for damage incurred d
38、ue to external causes unrelated to design. Planned maintenance actions and associated periodicities shall be provided as part of the design report (see 3.8.3). The reliability design requirement shall be as specified (see 6.2.1) except for those parts which are readily replaceable and subject to hea
39、vy wear or erosion. For these parts, the MTP is 20,000 hours with an associated mean-time-to-repair (MTTR) of no more than 24 man-hours. Reliability reports shall be as specified (see 4.7.5 and 6.2.1) and shall be prepared in accordance with the data ordering documents included in the contract or or
40、der (see 6.2.2). 3.2.3 Operating conditions. Bearing unit shall operate satisfactorily when supplied with lubricating oil, as specified in 3.4.1, under the loads defined herein and any possible combinations thereof. The numerical values of the loads (and speeds, where applicable) shall be as specifi
41、ed in the contract or order (see 6.2.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(a) Ahead propulsive thrust load. The range from minimum continuous ahead propulsive thrust at minimum sustained ahead shaft speed to design full power ahead pro
42、pulsive thrust at maximum design ahead shaft speed. (b) Astern propulsive thrust load. The range from minimum continuous astern propulsive thrust at minimum sustained astern shaft speed to design full power astern propulsive thrust at maximum design shaft speed . (c) Thrust lad due to full rudder ma
43、neuvers. Additional thrust equal to 20 percent of ahead propulsive thrust during ahead operation and 20 percent of astern propulsive thrust during astern operation. Full rudder maneuvers may be conducted at any speed, and time duration is not limited. The range from zero to design maximum submergenc
44、e thrust. Design maximum submergence thrust is defined as the thrust that occurs from seawater pressure at design depth acting on the shaft cross-sectional area and shaft seal up to the seal balance diameter, radial bearing due to weight of propulsion shaft components supported by the bearing as det
45、ermined from final shafting arrangement and alignment schedule and including the effect of alignment tolerances, alignment changes during operation, resilient mount drift, bearing weardown and forces and moments imposed by propulsor and flexible couplings. Orientation of line-of-action of journal lo
46、ad relative to radial bearing will vary as a function of ships attitude (roll and list). Radial bearing shall be designed to operate satisfactorily under maximum steady journal load over the full range of list and roll motions defined in 3.2,3(f). resulting from trim, list, and dynamic motions (roll
47、 and pitch) of ship, while it is operating submerged, at snorkelling depth and on the surface. Trim and list or roll and pitch can occur simultaneously. The following shall be as specified (see 6.2.1). (d) Submergence thrust load. (e) 14aximum steady journal load, Design maximum value of load on (f)
48、 Thrust loads from trim, list, roll and pitch. Thrust loads 1. Maximum permanent trim angle, down bow or stern. 2. Maximum permanent list angle, port or starboard. 3. Maximum roll angle and cycle time, port or starboard from 4, Maximum pitch angle and cycle time, up or down from normal even keel . w
49、ater line. Under some casualty conditions, trim angle may be up to 45 degrees. Bearing unit shall operate satisfactorily at this trim angle, but some oil leakage past seals is permitted (see 3.2.10.3.8). (g) Transient thrust during crash ahead and crash astern maneuvers. Additional thrust equal to 100 percent of design full power ahead or astern propulsive thrust for durations of up to 3 seconds. This load does not occur simultaneously with the full rudder maneuver load cited in 3.2
