1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2953C 47 9917906 0270333 O = MIL-S-2953C * 1.2.1.2 3- code number. The pressure rating of the strainer is identified as follows: patina code number ANSI B16.5 ratino; 06 15 Class 600 pound Class 1
2、500 pound 1.2.1.3 and Casting Inspection and Repair for Machinery, Piping and Pressure Vessels in Ships of the United States Navy. (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific acquisition functions should be obtained from the co
3、ntracting activity or as directed by the contracting officer.) * 2.2 Pther publica tions. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue In effect on dete of invitation for bids or request for proposal shall apply. AMER
4、ICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A167 - Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip. A193 - Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service. A194 - Carbon and Alloy Steel Nuts for Bolts for High-pressure and High-Temperature
5、Service. A216 - Carbon-Steel Castings Suitable for Fusion Welding for High-Temperature Service. A217 - Martensitic Stainless Steel and Alloy Steel Castings for Pressure-Containing Parts Suitable for High-Temperature Service. A240 - Heat-Resisting Chromium and Chromium-Nickel Stainless Steel Plate, S
6、heet, and Strip for Fusion- Welded Unfired Pressure Vessels. and Other Pressure-Containing Parts. A698 - Steel Bars, Carbon, Hot-Rolled and Cold-Components (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) AMERIC
7、AN NATIONAL STANDARDS INSTITUTE (ANSI) 81.12 - Class 5 Interference - Fit Thread. B16.5 - Steel Pipe Flanges and Fittings. B16.11 - Forged Steel Fittings, Socket-Welding and Threaded. B16.25 - Buttwelding Ends. (Application for copies should be addressed to the American National Standards Institute,
8、 Inc., 1430 Broadway, New York, NY 10018.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2953C AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) Boiler and Pressure Vessel Code - Section VIII, Division 1, Appendix II. (Application for copies
9、should be addressed to the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017.) (Technical society and technical association specifications and , standards are generally available for reference from libraries. They are also distributed among
10、 technical groups and using Federal agencies.) 3. REQUIREMENTS 3.1 Materials. Materials shall be as specified in table I. - Name of part Body Cover Basket screen Ga ske t s Studs for covers Nuts for covers TABLE I. Materi au. f I I Composition t ion 1 Compo;i t ion Materials form Casting ASTM A217,
11、ASTM A217, ASTH A216, - - grade WC9 grade WC6 grade WCB Casting Bar stock - - - ASTM A696 - ASTM A167, type 316 ASTM A240 Spiral wound MIL-G-21032, type I 8 Alloy steel ASTM A193, ASTM A193, for high grade 816 grade B16 temperature bolting Heavy semi- ASTM A194, ASTM A194, finished grade 4 grade 4 h
12、exagon carbon and alloy steel for high temperature bolting - ASTM A193, grades B7 and B16 ASTM Al 94 , grades 2, 2H and 4 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-II 3.1.1 Recovered materials. Unless otherwise specified herein, all equipment
13、, material, and articles incorporated in the products covered by this specification shall be new and shall be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which hav
14、e been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified.
15、 3.2 Desina a construction. 3.2.1 Sizes. Strainers shall be furnished in nominal pipe sizes of 1/2, 3/4, 1, 1-1/11, 1-1/2, 2, 2-1/2, or 3, as specified (see 1.2.1.4 and 6.2.1). i 4 3.2.2 connections . Strainers shall have flanged ends in accordance with ANSI 816.5 and table II, butt-weld ends in acc
16、ordance with ANSI B16.25, or socket weld ends in accordance with ANSI B16.11 as specified (see 1.2.1.3 and 6.2.1). The design of the strainer nozzle cross-section, the area between the end connection and the strainer body, shall be such that the connecting piping (considering maximum size and schedu
17、le to be used) will reach yield stress prior to the strainer nozzle cross-section. imensions. TABLE II. Flanne face-to-face d I - Rating Strainer size (inches) I I ANSI B16.5 r 2 1-1/4 1-1/2 1 /2 j/4 1 - Class 600 5-518 6-3/8 7-3/8 ii-3/6 CJ-Y/ 11-7/8 14-1/4 17-1/4 L. Class 1500 11 . 11-1/4 . 11-1/2
18、 13 3.2.3 W. Covers shall be flanged and bolted. Covers shall not be fitted with any connection for a blow valve. Wye type strainer covers shall be provided with a boss to facilitate attachment of a blow down or drain connection. The following features shall be incorporated: (al Cover alinement shal
19、l be obtained by body guiding, that is, a close tolerance fit between the cover and strainer body. The cover shall not be alined by means of the cover fasteners. (b) Flange joint design shall assure proper compression of type I gaskets, in accordance with MIL-G-21032, when body and cover flanges are
20、 drawn up metal-to-metal. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2753C ri7 7774 .O270337 8 C ver flanges shall be secured by any of the following: (1) Through bolts threaded the entire length and fitted with a nut on each end, Thread
21、s on the bolts and nuts shall be class 2 fit. at tap end and a class 2 fit at nut end. Interference shall be in accordance with ANSI B1.12. 2 fit of ASTM A193. Allen head type cap screws shall not be used. Threaded fasteners, quantity and size, shall comply with ASME Boiler and Pressure Vessel Code,
22、 Section VI, Division 1, Appendix II. (2) Tap end studs with interference class 5 fit (3) Cap screws in accordance with B-7, class 3.2.4 Basket gcreen. The free area through the basket screen shall be at least 2-1/2 times the area of the inlet. Holes shall be either punched or drilled with all burrs
23、 removed. Holes shall be 0.020 inch in diameter and equally spaced over the basket. Spacing of holes on centers shall be approximately twice the diameter of the hole or greater. Metal thickness of basket shall be 0.015 inch minimum. Wire mesh will not be acceptable. 3.2.5 Strainer body. The design o
24、f all strainers shall provide that steam shall pass through the basket and shall be directed axially into the inside of the basket so that any foreign material intercepted by the strainer may be withdrawn by removal of the cover. The basket shall be installed in such a manner as to provide for easy
25、removal. Each strainer shall have distinctly cast or stamped on one side of the body the size, the trademark of the manufacturer, and the pressure rating of the strainer. The walls of the bodies shall be curved surfaces; no flat surfaces will be peimitted. They shall be ribbed as necessary to provid
26、e strength. The low point of the strainer body shall be provided with a boss to facilitate installation of a drain connection by welding. In wye type strainers the boss on the strainer cover is considered to fulfill this requirement. t 3.3 pressure temDeratu. Pressure temperature rating shall be in
27、accordance with ANSI 16.5, class 600 and class 1500. 3.4 Shock. Strainers furnished in accordance with this specification, shall meet the requirements of MIL-S-901 when tested in accordance with 4.5.2. 3.5 Nondestructive Jest-. Nondestructive testing I requirements shall be in accordance with MIL-ST
28、D-278. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4. QUALITY ASSURANCE PROVISIONS 4.1 Resbons ibili tv fer JnsDecti on. Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirement
29、s as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the ins
30、pections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Samriling fer Quality confor mance insbectio n. 4.2.1 M. All strainers of the same composition, pressure rating, size, and construction offered
31、for delivery at the same time shall be considered a lot for purposes of sampling. 4.2.2 -1inq a examination nf d itegi. Sampling for the examination specified in 4.3.1 and 4.3.2 shall be conducted in accordance with MIL-STD-105. The acceptance quality levels (AQL), expressed in defects per hundred u
32、nits (DHU) and the inspection levels shall be as shown in table III. TABLE III. Insbect ion level. AQLS Inspect ion Examination levels Major Total Visual examination (see 4.3.1) II 2.5 6.5 Dimensional examination (see 4.3.2) I 1.5 4.0 4.3 Ex amina t ion. 4.3.1 Jiisua examination. Sample strainers sh
33、all be visually examined in accordance with table IV. I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2953C TABLE IV. Class ification af pefects. Defect I Examination Not material specified - Design and construction Component missing or damag
34、ed Workmanship I Poor assembly Cover not properly alined I Welding not properly fused or inadequate I I Poor finish on machining identification and marking Improper, missing or illegible I Major itn,” x I - - I x 4.3.2 Pimensi- mation. Sample strainers shall be examined to determine conformance with
35、 the dimensional requirements specified herein. Any deviation from the specified tolerances shall constitute a defect. Any dimensional lefect for pressure containing parts shall constitute a major defect. 4.4 parta. 4.4.1 Pressure contain- parts. Pressure containing parts shall be examined to determ
36、ine conformance with applicable specifications. 4.4.2 BonDressure containinnu. The DCASMA may accept certification that nonpressure containing parts conform to their applicable material specification providing that such certification contains the actual test, examination, or other verifiable data. 4
37、.5.1 Shelliests. Each of the strainers shall be subjected to the pressures specified in table V for the duration of 1 minute. The water temperature shall not exceed 100F. Any weeping, leakage, or Permanent deformation shall be cause for rejection. 8 Provided by IHSNot for ResaleNo reproduction or ne
38、tworking permitted without license from IHS-,-,-ANSI 016.5 rating I Pounds 1 b/ in2 I Pressure (gage) Class 600 Class 1500 Composition A and B 2250 5625 Composition D 2225 5575 I- I I II 4.5.2 Shock. Equipment and test classification shall be grade A, hull/bulkhead mounted, class III, type A. Method
39、 of mounting shall comply with figure 1. * 4.5.2.1 Strainer shall be hydrostatically pressurized with water to the cold rating specified in ANSI B16.5. Any external leakage of the strainer or straineripiping or visible damage to the strainer basket shall constitute failure. 4.5.3 Nondestruct ive tes
40、ts. Strainers 2-1/2 and 3 inches in size shall be tested in accordance with MIL-STD-278. 4.6 InsDection nf packaaillg . The preservation-packaging, packing, and marking shall be inspected for compliance with section 5 of this document. 5. PACKAGING (The packaging requirements specified herein apply
41、only for direct Government acquisitions. For the extent of applicability of the packaging requirements of referenced documents listed in section 2, see 6.4.) 5.1 Pr eservation -ackzRlntz, pack- u e. Steam strainers shall be preserved-packaged level A or C and packed level A, B, or C as specified (se
42、e 6.2.11, and marked in accordance with MIL-P-17286. 6. NOTES 6.1 Jntended u. Strainers covered by this specification are intended for steam and steam drain use only and have pressure-temperature ratings in accordance with ANSI 816.5 except for maximum allowable temperatures. The maximum temperature
43、 limitations will be 1050F for composition A strainers, 1000F for composition B strainers, and 775OF for composition D strainers. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2953C V7 973906 02703LiL T MIL-S- 2 9536 t 6.2 grdering data. Ac
44、quisition documents should specify the following: (a) Title, number, and date of this specification. (b) Definitive military specification part number required (see 1.2.1). (cl Quantity required. (d) Level of preservation-packaging and packing required (see 5.1). t 6.3 Defin itive militarv gDecifica
45、tion u number. The military specification part number is a definitive part number which corresponds to the composition, rating, end style, and size of the strainers covered by this specification and defines the requirements of the options presented under this specification. The military specificatio
46、n number, composition code letter, rating code number, end style code letter, and size code number are combined to form the definitive military specification part number. 6.4 Sub -contract e4 Werial azLp parts. The packaging requirements of referenced documents listed in section 2 do not apply when
47、material and parts are acquired by the contractor for incorporation into the equipment and lose their separate identity when the equipment is shipped. 4 6.5 SuDersessiop u. MIL-S-2953, dated 3 October 1951 has been superseded as follows: - I - Class a Class b Class c NAVSHIPS Drawing 810-841499 M295
48、3-DO6 XXX M2953-BO6 XXX 6.6 Channes fi*sra Dre viu issue. The margins of this specification are marked with an asterisk (fi) to indicate where changes (additions, modifications, corrections, deletions) from the previous issue were made. This was done as a convenience only and the Government assumes
49、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 irrespective of the marginal notations and relationship to the last previous issue. Custodians: Army - ME Navy - SH Army - ME Review activities: DLA - CS Preparing activity: Navy - SH Agent: DLA - CS (Project 4730
