NAVY MIL-C-18419 B (2)-1965 COMPRESSORS RECIPROCATING MOTOR DRIVEN NAVAL SHIPBOARD HIGH PRESSURE AIR SERVICE《海军船高压空中服务发动机驱动摆动压缩机》.pdf

1、- MIL-C-LiLSB (2) i3 M 99777Ob 04bL2b0 1i - L s, MIL-C-184 19B(SHIPS) AMENDMENT- 2 6 January 1965 SUPERSEDING 1:- - Amendment- 1 . . 14 April 1964 0 MILITARY SPECIFICATION COMPRESSORS, RECIPROCATING, MOTOR DRIVEN, NAVAL SHIPBOARD HIGH PRESSURE AIR SERVICE This amendment forms a part of Military Spec

2、i- fication MIL-C-l8419B(SHIPS), 29 June 1962. + Pages 1 and 2, paragraph 2.1: Make the following changes: Under “Specifications, Federal“ add: IFF-B- 185 - Bearings, Roller, Cylindrical: and Bearings, Roller, Self-aligning. I Under “Standards, Military“ add: “MIL-STD-276 - Impregnation of Porous No

3、nferrous Metal Castings. “MIL-STD-438 - Schedule of Piping, Valves, Fittings and Associated Piping Components for “MIL-STD-777 - Schedule of Piping, Valves, Fittings and Associated Piping Components for Submarine Service. Surface Ships.“ Under “Drawings, Bureau of Ships“ delete “5000-S4800-3000“ and

4、 add: 810-1385941 - Fittings. Sil Brzg: WOG, 3000 psi for UiT Inspection. “810-1385942 - Fittings, Bronze Sil Brzg., WOG, for U/T Inspection. “810-1385943 - Unions, Sil Brzg., 3000 psi, WOG, IPS for U/T Inspection. “810- 1385944 - Fittings, Sil Brzg., OD, 3000 psi, WOG for U/T Inspection. “810-13859

5、45 - Bushings, Reducing, CU-NI Sil Brzg., WOG for U/T Inspection. “810-1385946 - Unions, Bronze Sil Brzg., WOG for U/T Inspection. “810- 1385948 - Unions. Sil Brzg., OD 3000 psi, WOG for UT Inspection. “810- 1385950 - Bosses, Non-Ferrous, Piping for U/T Inspection. “810-1385951 - Bushings, Reducing,

6、 CU-NI Sil Brzg., IPS, 3000 psi, WOG for U/T Inspection. “810-1385952 - Bushings, Reducing, CU-NI Sil Brzg., OD 3000 psi, WOG for U/T Inspection.“ Under “Publications, Bureau of Ships“ delete: “NAVSHIPS 250-637-2“ and “NAVSHIPS 250-648-8“ and add “NAVSHIPS 250-634-6 - Fabrication and Inspection of B

7、razed Piping Systems.“ Page 2, paragraph 2.2: Under “Compressed Air and GasInstitute“ in third 1ine.change “2nd edition“ to “3rd edition“. LCHANGES FROM PREVIOUS ISSUE. THE OUTSIDE MARGINS OF THIS DOCUMENT HAVE BEEN MARKED “% TO INDICATE WHERE CHANGES (DELETIONS, ADDITIONS, ETC,) FROM THE PREVI- OUS

8、 ISSUE HAVE BEEN MADE. THIS HAS BEEN DONE AS A CONVENIENCE ONLY AND THE GOV- ERNMENT ASSUMES NO LIABILITY WHATSOEVER FOR ANY INACCURACIES IN THESE NOTATIONS. BIDDERS AND CONTRACTORS ARE CAUTIONED TO EVALUATE THE REQUIREMENTS OF THIS DOCUMENT BASED ON THE ENTIRE CONTENT AS WRITTEN IRRESPECTIVE OF THE

9、 MARGINAL SOTATIONS AND RELATIONSHIP TO THE LAST PREVIOUS ISSUE. I FSC 43101 /- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-II NIL-C-L419B (2) L13 W 9999906 OL1bL2bL 3 A I MIL-C- 18419B(SHIPS) AMENDMENT- 2 # Page 3, paragraphs 3.3 through 3.3.1

10、.3: Delete and substitute: . “3.3 General design. - - “3.3.1 Tlie principle of maximum reliability is paramount and no compromise of this principle shall be made with .my ocher basic requirements of design. Where wear or corrosion is unavoidable, the parts sub- jected EO such wear or corrosion shall

11、 be of the best material for the purpose in order to reduce those detri- mental effects to 2 minimum. It is the intention of this specification to obtain air compressors of such design that they will haye an operating life of at least 50,000 hours with no limitation on the number of starts and stops

12、, and without major overhauls of less than 10,000 hours intervals. Replacement of easily replaceable wearins parts such as cylinder suction and discharge air valves should not be required at intervals of less than 1000 hours. Replacement of piston rings should not be required at intervals of less th

13、an 1000 hours for the high pressure stages and of not less than 2000 hours for the first and second stages. “3.3.1.1 The designer should take cognizance of the conditions under which equipment will be maintained and repaired on shipboard, and of the fact that the personnel responsible for maintenanc

14、e and repair may not be seasoned mechanics. For example, parts should be so designed that it is impossible to replace them in a wrong position; and adjacent studs should be of the same length, or of large difference in lengths, so that a mistake will not easily occur; serrated surfaces should not be

15、 used for accurate positioning unless specifi- cally approved by the Bureau of Ships since areas should be avoided where strong wrenching would cause damage. sors shall. incorporate all the following requirements: “3.3.1.2 in addition to the paramount concept of reliability, the design and construct

16、ion of all compres- /- (a) Accessibility for repair. (b) Satisfactory operation when inclined as follows: (1) Up to 30 degrees in any direction (permanently inclined), (2) With the ship rolling up to 60 degrees from the vertical to either side, taking 8 seconds for (3) With the ship pitching 10 degr

17、ees up and down from the normal horizontal plane, taking 6 a complete cycle (with direction of crankshaft in fore and aft position). seconds for a complete cycle. (c) Quiet operation. (d) Minimum space and weight. “3.3,1.3 To be in consonance with 3.3.1.2(d) the dry weight of compressors with 440 vo

18、lt (v.) alternating current (a.c.) motors, less motor controllers, but including all other appurtenances, shall not exceed 4000 pounds. The corresponding weight with 230 v. direct current (d.c.) motors shall not exceed 5000 pounds. “3.3.1.4 Reliability analysis.- In order to achieve the desired reli

19、ability the contractor shall submit an analysis of those factors effecting reliability, as highlighted in 3.3.1. The analysis shall be such that the composite reliability of the compressor, including essential appurtenances, can be predicted in terms of mean-time-between-failures (MTBF). MTBF is the

20、 time which equipment (parts, material) can be expected to operate satisfactorily before failure occurs. “3.3.1.4.1 The reliability analysis shall include, but shall not be limited to the following: (a) List of those parts which experience and judgement show are subject to wear and service fail- (b)

21、 Specific design features employed to attain the required service life of the parts. Some sug- (c) CompIete calculations of temperatures throughout the air path. (d) Choice an& analysis of all bearings. (e) Inter and after cooler design data, (f) How failure of one part affects other parts. ures. ge

22、ated design features are: choice of materials, compatability of materials, hardness, surface finishes, fits, clearances, and so forth, Include calculations when applicable. “3.3.1.4.2 The reliability knalysis shall include preventive maintenance and servicing requirements nec- essary to the achievem

23、ent of the predicted MTBF. Any unusual steps or precautions necessary in carrying out maintenance and servicing requirements shall be pointed out. Page 2 of 5 pages Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a . MIL-C-LqLSB (2) LI3 m 9999906 046

24、1262 5 W MIL-C- 18419B(SHIPS) AMELNDMENT-2 “3.3.1.5 The reliability analysis shall be submitted at the same time, or prior to, the submittal of class A and class D drawings for approval (see 3.7.7.2). Approval of the reliability analysis is a requisite for ap- proval of new class 4 and class D drawi

25、ngs. 3 the case of chss A drawings approved prior to the require- ment for reliability analysis, such reliability analysis shall be submitted to the Bureau of Ships for approval $rior to using the dass X drawings on any contract or order involving a bidding invitation dated subsequent to GE date of

26、this specification amendment.“ P:ge 4, paragraph 3.3.4(c), after “Relative humidity“: Delete “50 percent“ and substitute “0.0 percent t2ry &:I-!. Y Page 4, paragraph 3.3.5.1: Delete and substitute: “3.3.5.1 The design of all complete air compressor units shall be such that they are capable of passin

27、g the t?rpe A, high impact (H.I.) shock tests for grade A, class III, equipment in accordance with MIL-S-901. A shock test with the compressor solidly mounted is considered proof of dass III capability (see 4.5.4). NAV- SHIPS 250-660-30 may be used as a guide for design of shock resistant Naval equi

28、pment. Page 4, paragraph 3.3.6.2, last sentence: Delete and substitute: “The compressor manufacturer will not be required to furnish any mounting members, motion limiting, or vibration buffering devices between the isolation mounts and the ships structure.“ Page 4, paragraph 3.3.7, first sentence: D

29、elete and substitute: “Gage board temperature indicating and alarm instrument, drain valves and all features of an operational nature shall be located on or operable from one side, designated as the operating side of the compressor, so as to be accessible if the compressor is installed adjacent to a

30、 bulkhead.“ Page 5, paragraph 3.3.14.1, line 3: After “MIL-B-17931“ insert “or FF-B-185“. Page 5, paragraph 3.3.15.3, line 3: Between “bearings,“ and “gears“ insert “wrist pin bearings,“. Page 6, paragraph 3.3.16, third sentence: Delete and substitute: “Al1 top arid bottom bearing surfaces shall be

31、machine finished, except bottom of subbases designed for center-of-gravity sound-isolation support.“ Page 6, paragraph 3.3.17, third sentence: Insert a period after “bearings“ and delete the remainder of the sentence, Page 6, paragraph 3.3.19.1.3, line 3: Delete “motor“ and substitute “water“. Page

32、8, paragraph 3.3.20.5, first sentence: Insert a period after “minimum“ and delete the remainder of the sentence. Page 9, paragraph 3.3.25: Delete and substitute: “3.3.25 Piping.- . “3.3.25.1 All piping and fittings shall conform to MIL-STD-438 or MIL-STD-777 except as modified herein. Where ultrason

33、ic inspection requirements are invoked components to the following Bureau of Ships drawings shall be used 810-1385941 to 810-1385946 inclusive, 810-1385948, 810-1385950 to 810-1385952 inclusive. “3.3.25.2 Unions or flanges shall be used for compressor water connections to external shipboard piping s

34、ystems. The unions and flanges shall be in accordance with MIL-F-1183 and MIL-F-20042 respectively. When space or weight savings can be effected, terminal connections to compressor component parts may have unions partially integrated with such parts, and may utilize the brazed or welded ring and mal

35、e union nut type of construction with soft copper gaskets. Tapered pipe thread connections shail not be used except for fittings such as plugs for core holes, or the dead ends of cross-drilled passages, which are intended to keep openings Fage 3 of 5 pages I Provided by IHSNot for ResaleNo reproduct

36、ion or networking permitted without license from IHS-,-,- MILCLB439B (2) 43 U 9999906 0463263 7 U I MIL-C- 18419B(SHIPS) AMENDMENT-2 permanently closed. Terminals and joints of small tubing lines mounted on the compressor shall be straight thread flareless fittings conforming to MIL-F-21467 except t

37、hat working pressures above 3000 psi will be permitted in the 1/4 inch outside diameter (0.d.) size only. The final discharge air connection to the ships piping shall be a union connection in accordance with Drawing 810-1385884 with socket welding tail piece. All piping shall be designed and arrange

38、d to permit maximum accessibility to compressor parts requiring peri- odic inspections or repair. “3.3.25.3 All silver brazed piping connections shall conform to the fabrication and inspection require- ments of XAVSHIPS 250-634-6.“ # Page 9, paragraph 3.3.29: line 2: Delete “sulfuric“. Page 11, para

39、graph 3.5.2.1, line 7: Delete “(see 3.3.1.5.4)“ and substitute “(3.3.15.4)“. Page 12, paragraph 3.6.1: Delete and substitute: “3.6.1 Onboard.- When required by the contract or order (see 6.1), repair parts shall be furnished and processed in accordance with MIL-P-15137. Each set of repair parts shal

40、l consist of the parts listed on the latest approved Allowance Parts List (APL) covering the particular equipment being furnished under the con- tract or order. if no approved APL exists covering the particular equipment, then table II shall be used as the basis for provisioning forms required by MI

41、L-P- 15 137, and any other items considered necessary by either the bureau or agency concerned or the manufacturer to be essential in successful servicing of the equipment shall be included.“ Page 16, paragraph 3.7.4.3.3, line 3: Delete “shall“ and substitute “may“. # Page 17, paragraph 4.1: Delete

42、and substitute: “4.1 Responsibility for inspection. - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any co

43、mmercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the speci- fication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.“ Page 19, paragraph 4,5.1.2, line 3:

44、Delete “NAVSHIPS 250-648-8“ and substitute “NAVSHIPS 250-634-6.“ Page 19, paragraph 4.5.2.1, at the end of the first sentence change the period to a comma and add “cor- rected to rated speed, receiver temperature, zero humidity and 14.7 p.s.i.a. barometer“: last sentence: De- lete and substitute: “T

45、he calibration of the flask volume shall be at the final flask temperature of 122F., and shall be made in the presence of the Government inspector.“ Page 19, paragraph 4.5.2.1.1, lines 4 and 5: Delete “second“ and substitute “third“. Page 21, paragraph 4.5.3.8, line 4: Delete “3.3.1 (e)“ and substit

46、ute “3.3.1.2 (b)“. # # Page 21: Add as paragraphs 4.5.3.10, 4.5.3.10.1 and 4.5.3.10.2: “4.5.3.10 Castings, testing and repair.- Castings having excess porosity, sponginess or cracks will be cause for rejection. Peening of such castings to repair defects will not be permitted. Where minor porosity is

47、 evident as disclosed by weeping or sweating, castings may be repaired by impregnation in accordance with “4.5.3.10.1 For water jacketed cylinder castings (less cylinder liners) where radiographic inspection is required as a prerequisite to impregnation but is not practical due to the design of the

48、castings, these cast- ings shall be subjected to the proof test in 4.5.3.10.2 in lieu of radiographic inspection prior to impregnation. MIL- STD-276. “4.5.3.10.2 First hydrostatically test the castings to a pressure of 1000 p.s.i.g. with the pressure np- plied slowly and maintained for 15 minutes. F

49、ollowing this, the castings shall be inspected by dye penetrant Page 4 of 5 pages Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C- 18419B(SHIPS) AMENDMENT- 2 test. Then if the castings pass both the dye penetrant test, without giving evidence of linear indications. and the 1000 p.s.i.g. hydrostatic pressure test, they may be impregnated.“ Page 21, paragraph 4.5.4, line 4: Delete “grade“ and substitute “class“: after last se