1、DOD-P-24562A 20 W 7777706 0373077 3 W 1 November 1982 SUPERSEDING DOD-P-24562(SH) 28 December 1977 (See 6.6) MILITARY SPECIFICATION f PROPELLERS, SHIP, CONTROLLABLE PITCH (METRIC) This specification is approved for use by.the Naval Sea Systems Command, Department of the Navy, and is available for us
2、e by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers general requirements for marine propellers of the controllable pitch type. Specific requirements will be in accordance with the contract or order. For this specification, a propeller shall b
3、e considered as consisting of propeller blades, a hub with an internal activating mechanism for the blades, propulsion shafting, shafting internal components, an oil distribution box or pitch control unit, hydraulic and mechanical systems required for operation of the propeller pitch mechanism, and
4、associated components, tools, and devices. 1.2 Classification. Controllable pitch propellers shall be of the fol- lowing styles, blade designs, types, and levels, as specified (see 6.2.1): Style H - Hydraulic or hydro-mechanical propeller blade Style M - Mechanical propeller blade actuating mechanis
5、m. Blade design A - Propeller hydrodynamic blade design provided by the contracting activity (see 3.4.2). Blade design B - Propeller hydrodynamic blade design provided by the contractor (see 3.4.3). Blade design C - Propeller blade design in accordance with American Bureau of Shipping (ABS) Rules wi
6、th no ice strength- ening requirements (see 3.4.3). actuating mechanism. 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, W
7、ashington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Blade design D - Propeller blade design i
8、n accordance with ABS Rules, Tolerance level 1 - Very high tolerances on hydrodynamic surface measure- Tolerance level 2 - High tolerances on hydrodynamic surface measurements Tolerance level 3 - Moderate tolerances on hydrodynamic surface measure- Tolerance level 4 - Tolerances on hydrodynamic surf
9、ace measurements to with ice strengthening (see 3.4.3). ments (see 3.17.2). (see 3.17.3). ments (see 3.17.4). suit the intended service (see 3.17.5). (see 3.7.4). motor-driven (see 3.7.5). standby pump, shaft- or gear-driven (see 3.7.6). 4.4.2, 4.4.5, 4.5, and 4.6). (see 4.4.1, 4.4.3, 4.4.5, 4.5, an
10、d 4.6). in ship (see 4.4.1, 4.4.4, 4.4.5, 4.5, and 4.6), Type 1 - Hydraulic system main pump, shaft- or gear-driven Type 2 - Hydraulic system main and standby pumps, electric Type 3 - Hydraulic system main pump, electric motor-driven; Test level A - Spin testing of assembled propellers (see 4.4.1, T
11、est level B - Nonrotating testing of assembled propellers Test level C - Testing of assembled propeller following installation 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks, Unless otherwise speci- fied, the following specifications, standards, and
12、handbook of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein, SPECIFICATIONS FEDERAL PF-B-17 1 FF-B-185 FF-B-187 FF-S-86 FF-S-92 FF-S-200 FF-S-210
13、GG-1-492 QQ-T-390 TT-S-1732 PPP-B-601 PPP-B-62 1 - Bearings, Ball, Annular (General Purpose). - Bearings, Roller, Cylindrical; and Bearings, Roller, - Bearing, Roller, Tapered. - Screw, Cap ,. Socket-Head . - Screw, Machine: Slotted, Cross-Recessed or Hexagon - Setscrews; Hexagon Socket and Spline S
14、ocket, Headless, - Setscrews: Square Head (Inch) and Slotted Headless - Indicator, Sight, Liquid. - Tin Alloy Ingots and Castings and Lead Alloy Ingots Self -Aligning . Head . (Inch and Metric) . and Castings (Antifriction Metal) for Bearing Applications. - Sealing Compound; Pipe Joint and Thread, L
15、ead Free General Purpose. - Boxes, Wood, Cleated-Plywood. I; Bbxds ,=-Wood ; Nailed. and. :Lo where an amount of play is not objectionable, Unified lA/lB fits may be used. Inter- ference fit threads shall be American National Coarse, class 5. - Male threads on threaded fasteners shall extend one to
16、five thread lengths beyondthe nut. Washers shall not be used for the sole purpose of lessening thread protrusis: The shear load strength of engaged threads shall exceed tensile load strength of the stud or bolt. Threaded fasteners subject to loosening by vibration, accessible only by disassembly, or
17、 not accessible while the propeller shaft is turning, shall be self-locking or shall be provided with cotter pins or safety- wires in accordance with MS33540. Lock washers shall not be used. Propeller blade bolts and threaded fasteners installed in locations where the use of self-locking fasteners,
18、cotter pins, or safety wires is impractical shall be torqued or prestressed under controlled conditions to assure the retention of tightness and to minimize the magnitude of cyclic loads transmitted therethrough. Locking devices shall be used for mounting -bolts for electrical equipment, except for
19、the fittings specified in NAVSEA 0900-LP-000-1000. Anti-seizing compound shall be used where appropriate to reduce galling. Anti-seizing compound shall not be used in areas in contact with hydraulic fluid except where required. Antiseizing compound shall not be used as an alternative to proper mater
20、ial selection. Plugs in the hub, propeller cap, and areas which are inaccessible while the propulsion system is rotating, shall be staked or peened at assembly to prevent loosening. Set screws shall be utilized only where alternative means are not feasible. 3.3.8 Bolt and pin connections. Bolt and p
21、in connections between the propeller blades and hub, and between the propeller hub and shaft shall be drilled to jigs. 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3,3.9 Resilient mounts, When resilient mounts are specified (see 6.2.1) or used,
22、 resilient mounts shall be in accordance with MIL+-17185. Selection and installation of mounts shall be in accordance with NAVSEA 0900-LP-089-5010, Units installed on such mounts shall have sufficient stability to prevent excessive motion under all ship operating conditions, including shock when spe
23、cified, Sufficient clearances shall be provided to prevent resiliently mounted units from striking structures, adjacent fixed or resiliently mounted units, or other fixed objects under all ship operating conditions, including shock when specified. Piping rigidly attached to a resiliently mounted uni
24、t shall be considered as integral with the unit. If in an installation placed on resilient mounts, there is a possibility of misalinement between two or more components connected by shafting, the components shall be mounted on a common subbase with the mounts installed between the subbase and the su
25、pporting structure. The subbase shall not result in misalinement of components when the subbase is rigidly supported at three extreme corner points. 3.3,lO Piping and tubing. Piping and tubing shall be designed in accord- ance with ASME B31,l. 3.3.11 Vents. Tank vents shall be 1-1/2 inches iron pipe
26、 size minimum. Tank vents shall be run with the maximum attainable slope and with no pockets to facilitate draining back to the tanks served. Sump tank vents shall terminate in the hub head tank, unless pressurized hub head tanks are provided. Other tank vents shall terminate in return bends, the we
27、ather, or ventilated spaces clear of air ports, ventilation intakes, and sources of heat or sparks. Pipe line vents shall be provided at the high points of oil and water lines for bleeding air from lines. Vents on the oil distribution box shall be designed and located to preclude visible oil leakage
28、. 3.3.12 Drains, Drains shall be provided as required for system operation and at low points for complete drainage of the inboard portions of the propeller for maintenance and disassembly. Hydraulic fluid drains shall discharge to the sump tank, except that hydraulic fluid drains used only for maint
29、enance may be arranged to drain into a bucket. 3.3.13 Flexible connections. Piping connections between fixed; shaft mounted, and resiliently mounted equipment shall be through the use of flexible connections. 3.3.14 Shaft bore tubing and hose joints. Joints in tubing and hoses in the shaft bore shal
30、l be provided at or immediately adjacent to each shaft section coupling. Joints at any shaft section coupling shall be separable without disturbing the joints at other couplings. 3,3,15 Fluid velocities. Fluid velocities shall not exceed the -following: (a) Air flow through vent piping: 7.6 meters p
31、er second (m/s) (25 feet per second (ft/s) when tanks are being filled at the maximum rate. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(b) Sea water piping: 4.6 m/s (15 ft/s). (c) Sea water at oil cooler inlet nozzles: 2.3 m/s (7-1/2 ft/s)* (
32、d) Hydraulic fluid (pressurized): 6.1 m/s (20 ft/s). (e) Hydraulic fluid in pump suction_ lines and in lines having no . positive head: 1.2 mis (4 ft/s).- 3.3.16 Lifting devices. Provision shall be made for eyebolts or other lifting devices- for components where mechanical assistance is necessary du
33、e to weight or location. No provisions for eyebolts are required for the hub casting. If provision is made for a lifting eyebolt on the propeller hub casting, an eyebolt, designed as specified on Drawing 810-4435837, shall be provided with each hub. 3.3 A7 Instrumented trials requirements. If instru
34、mented trials are specified (see-6.2.1), provision- shall be made for the installation of test instrumentation .as specified in 4.6.6. The equipment used and method of instal- lation shall be in accordance with instrumented trials drawings (see 3.21.i.9). 3.4 Propeller blade and blade attachment des
35、ign. 3.4.1 Propeller blade attachment. Propeller blades shall be individually attached to the-propeller hub. When specified (see 6.2.1), the design of the blade-to-hub attachment shall be such as to permit blades. to be changed under- water without loss of oil, without flooding of any space normally
36、 filled with hydraulic fkiid, and without significant degradation of any propeller parts. 3.4.2 Blade design A. The design of“the propeller blades shall suit the hydrodynamic blade design, predicted powering performance, wake data, and unsteady blade forces provided by the contracting activity. Mino
37、r modifications in the hydrodynamic blade design are acceptable if the blade palm diameter selected by the contractor dif-fers from the one assumed in the hydrodynamic design, provided that the changes do not degrade the design. 3.4.3 Blade designs B, C, and D. The design of the propeller blades sha
38、ll be suitable for the intended service. In addition, blade design C shall meet ABS requirements for propellers without ice strengthening, and-blade design D shall meet ABS requirements for ice strengthening for the ABS ice class speci- fied (see 6.2.1). 3.4.4 Blade fillet design. The fillet between
39、 the hydrodynamic blade surface and the blade palm shall be designed in accordance with Drawing 810-4435837, except that deviations are permissible where hydrodynamic surfaces abut the edge of the blade palm and to improve distribution of forces among propeller blade bolts. 3.4.5 Numerically control
40、led machining of blades. If numerically con- trolled machining is specified (see 6.2.1), propeller blades shall be machined using equipment programmed for automatic contouring of hydrodynamic surfaces. Edges and tips may be formed using conventional means. 3.4.6 Prairie air orifices in blades. For p
41、ropellers with a prairie air system, holes shall be provided in the pressure and suction faces of the blades for passage of air. Holes shall be 1.2 mm (3/64 inch) diameter, drilled normal to the blade surface, and spaced 25 mm (1 inch) apart. Holes shall be 17 Provided by IHSNot for ResaleNo reprodu
42、ction or networking permitted without license from IHS-,-,-located along a locus of points 19 mm (3/4 inch) from the edge of the blade in the developed view. Holes shall extend from the intersection of the blade surface and the fillet, around the leading edge, to a point 125 mm (5 inches) past the b
43、lade centerline. The channel for air supply to the holes may be machined in either the pressure or suction face. The channel shall be approxi- mately 25 mm (1 inch) wide. Depth of the channel shall provide sufficient pas- sage for the air to the holes. Minimum depth of the channel shall be 2.4 mm (3
44、/32 inch) at the blade tip. Changes in depth shall be faired smoothly. The channel shall be provided with lands for welding of a cover plate. Minimum dimensions of the cover plate shall be 38 mm (1-1/2 inches) wide by 2.8 mm (7/64 inch) thick after final machining. Joint design shall be in accordanc
45、e wth MIL-STD-22. Joints between prairie air channel cover plates and propeller blade castings shall be of the single “V“ or single “U“ type with minimum root openings of 4.8 mm (3/16 inch). Butt welds in prairie air channel cover plates shall be such to assure 100 percent penetration without burnth
46、rough. The completed fabrication shall be free of slag, weld chips, and other material which could interfere with air flow. 3,4,7 Blade edge protectors. Following component examination and testing (see 4.4.1), propeller blade edges shall be protected at all times, except during subsequent testing an
47、d application of preservation-packaging, by the use of edge protectors. Edge protectors shall be formed and installed as specified in MIL-P-2845. 3.5 Main propulsion shafting, Main propulsion shafting shall meet the requirements as specified (see 6.2.1). The contractor shall ensure that all componen
48、ts of the propeller are compatible with these requirements. 3.6 Bearing design. 3.6.1 General, Babbitt bearings shall be cast in accordance with NAVSEA 0283-LP-228-1000, The babbitting technique used shall be in accordance with one of the destructtve tests specified in NAVSEA 0283-LP-228-1000, 3.6.2
49、 Thrust bearings. For shaft-mounted oil distribution boxes, a thrust bearing shall be provided within the oil distribution box to maintain proper longitudinal positioning of the box or unit. For shaftlnounted prairie air inlet housings, a thrust bearing shall be provided within the housing to main- tain proper longitudinal positioning of the housing. Thrust bearings shall be provided with replaceable babbitt inserts. Consideration shall be given to the effect of temperature changes on axial clearances
