1、. MILITARY SPECIFICATION VALVES, ANGLE, RELIEF, FOR GAS AND OXYGEN SERVICE (SIZES 2-INCHES IPS AND BELOW); NAVAL SHIPBOARD MIL-V-22549D(SHIPS) 20 September 1968 SUPEFSEDING 28 November 1966 (See 6.3) MIL-V-22549C(SHIPS) 1. SCOPE 1.1 Scope. - This specification covers angle relief valves of pressure
2、tight spring housing construc- tion for gas and oxygen service. 1.2 Ratings. - Valves shall have nominal pressure ratings of 400, 1500, 3000, and 6000 pounds per 4 square inch gage (psig) (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for
3、bids or request for proposal, form a part of the specification to the extent specified herein. SPECIFICATIONS FEDERAL QQ-N-281 - Nickel-Copper-Alloy, Bar, Plate, Rod, Sheet, Strip, Wire, Forgings and Struc- tural and Special Shaped Sections. QQ-N-288 - Nickel-Copper-Alloy and Nickel-Copper-Silicon A
4、lloy Castings. QQ-S-764 - Steel Bar, Corrosion-Resisting, Free Machining. MILITARY MIL-S-901 - Shock Tests, H. I. (High-Impact); Shipboard Machinery, Equipment and MIL-D-1000/2 - Drawings, Engineering and Associated Lists. MIL-F-1183 - Fittings, Tube, Cast Bronze, Silver Brazing. MIL-M-15071 - Manua
5、ls, Equipment and Systems. Systems, Requirements for MIL-B-I - Bronze, Nickel-Aluminum Castings for Seawater Service. MIL-B-24059 - Bronze, Nickel Aluminum; Rod, Flat Products with Finished Edges, Shapes and Forgings. STANDARDS MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-167 - M
6、echanical Vibrations of Shipboard Equipment. MIL-STD-1330 - Cleaning and Testing of Oxygen and Nitrogen Gis Piping Systems, I DRAWINGS MILITARY -810-1385884 - Unions, Fittings and Adapters, Butt and Socket Welding, 6000 PSI, WOG, IPS. 810-1385943 - Unions, Silver Brazing, 3000 PSI, IPS, WOG for UT I
7、nspection. -7 810-1385946 - Unions, Bronze Silver Brazing, WOG, for UT Inspection. F FSC 4821) p. I , B Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-22549D(SHIPS) (Copies of specifications, standards and drawings required by suppliers in con
8、nection with specific Pro- curement functions should be obtained from the procuring activity or as directed by the contracting officer, ) 2.2 Other publications. - The following documents form a part of this specification to the extent spei- fied herein. Unless otherwise indicated, the issue in effe
9、ct on date of invitation for bids or request for pro- posal shall apply. AMERICAN IRON AND STEEL INSTITUTE (AISI) Steel Products Manual (Application for copies should be addressed to the American Iron and Steel Institute, 150 East Forty- Second Street, New York, New York 10017). AMERICAN SOCIETY FOR
10、 TESTING MATERIALS (ASTM) B21 - Naval Brass, Rod, Bar and Shapes. B61 - Steam or Value Bronze Castings B148 - Aluminum Bronze Sand Castings B150 - Aluminum Bronze Rod, Bar and Shapes. (Application for copies should be addressed to the American Society for Testing Materials, 1916 Race Street, Philade
11、lphia, Pa. 19103). NATIONAL BUREAU OF STANDARDS Handbook H-28 - Screw-Thread Standards For Federal Services. (Application for copies should be addressed to Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402). AMERICAN SOCIETY OF MECHANICAL ENGINEERS Boiler and Pre
12、ssure Vessel Code. (Application for copies should be addressed to the American Society of Mechanical Engineers, 345 East 47th Street, New York, New York 10017). (Technical society and technical association specifications and standards are generally available for reference from libraries. They are al
13、so distributed among technical groups and using Federal Agencies). 3. REQUIREMENTS 3.1 Definitions. - The following definitions are applicable to this specification. # 3.1.1 Set pressure. - The pressure at which the valve pops, Expressed in pounds per square inch gage (psig). # 3.1.2 Set pressure to
14、lerance. - The permissible plus or minus deviation from the specified set pres- sure. Expressed in pounds per square inch (psi) or as a percent of the set pressure. # 3.1.3 Set pressure range. - The range over which the set pressure can be adjusted with the installed spring. 3.1.4 Accumulation. - Th
15、e increase in pressure, above the set pressure required to pass rated flow. Expressed in psi or as a percent of the set pressure. # 3.1.5 Accumulation pressure. - The set pressure plus the accumulation. Expressed in psig. # 3.1.6 Blowdown. - The decrease in pressure, below the set pressure, required
16、 for the valve to reseat, Expressed in psi or as a percent or the set pressure. The accumulation and blowdown establish the operat- ing band of the relief valve at a particular setting. P 3.1.7 Blowdown pressure. - The set pressure minus the blowdown. Expressed in psig. -. -7 n Provided by IHSNot fo
17、r ResaleNo reproduction or networking permitted without license from IHS-,-,-u 3.2 Valve description. - The valves shall be self-contained, single seated, spring loaded relief valves where the inlet pressure is sensed under and directly operates the spring loaded disc. Where operationally advantageo
18、us, other self-contained designs (such as inverted, expanded area, or pilot operated) which con- form to the basic requirements of this specification, may be permitted, However, all of these alternate designs shall be of the fail-open design and approval for their use is required by the Auxiliary Eq
19、uipment Branch of the Naval Ship Engineering Center, H 3.3 Materials of construction, - Materials shall be as specified hereinafter. They shall be suitable for the intended pressure and shall be selected to prevent galling, seizing, or excessive wear between operating parts. 3.3.1 Gas service. - 3.
20、3.1.1 Body and spring housing, - The body and spring housing shall be one of the following basic ma- terials: (a) 18-8 corrosion resistant (stainless) steel - ALSI 303, 304 or 316. (b) Aluminum bronze - Grade 9BHT of ASTM B-148, alloy 2 of ASTM B-150, MIL-B-23921 or MIL-B-24059. When castings are us
21、ed, the body shall be cast as a solid billet, Coring will not be permitted. (c) Bronze - ASTM B-61. (d) Naval brass - Alloy B of ASTM B-21. 3.3.1.2 Springs. - Springs shall be manufactured from corrosion-resistant steel or carbon-steel. Where carbon-steel springs are used, they shall be electroplate
22、d with cadmium or zinc. 3.3.1.3 Non-metallic disc inserts, diaphragms, gaskets and similar parts. - All non-metallic parts shall be compatible with the fluid media specified (see 6.2). These parts shall also be compatible with both petroleumbase andphosphate estertypefluids, and shall be as approved
23、 by the command or agency concerned. - 3.3.1.4 Valve stems. - Valves stems shall be manufactured from nickel-copper alloy (monel) or cor- rosion-resistant steel. 3. 3.1.5 Nuts, bolts, washers, bushings, guides, bellows and similar parts.- All materials used in the construction of nuts, bolts, washer
24、s, bushings, guides, bellows and similar parts shall be of the quality best suited for the intended purpose and shall be in strict accordance with the material specification shown on the approved drawing. 3.3.2 Oxygen service.- “ 3.3.2.1 Body and spring housing. - The body and spring housing shall b
25、e of monel (nickel-copper alloy) in accordance with QQ-N-281 or QQ-N-288. 3. 3.2.2 Springs, - Springs shall be manufactured from one of the following materials: (a) Bronze (b) Monel (nickel-copper-alloy) (c) Copper-nickel-alloy (70-30). 3.3.2.3 Valve stems, - Valve stems shall be manufactured from m
26、onel (nickel-copper-alloy) or copper nickel-alloy (70-30). 3.3.2.4 Valve disc inserts, - Valve disc inserts shall be manufactured from Teflon, 3.3.2.5 -Diaphragms, “O1 rings, gaskets and similar parts. - Diaphragms, “O1 rings, gaskets and similar parts shall be in accordance with the requirements sp
27、ecified in 3.3.1.3 (see 6.2). 3.3.2.6 Nuts, bolts, bushings, guides and similar parts. - Nuts, bolts, bushings, guides and similar parts shall be in accordance with the requirements specified in 3.3.1.5. f- “ 3 -1 I. 3 / . Provided by IHSNot for ResaleNo reproduction or networking permitted without
28、license from IHS-,-,-3.4 Design and construction. - # 3.4.1 Pressure-temperature ratings. - The pressure-temperature ratings for valves covered by this specification shall be as specified in 3.4.1.1 and 3.4.1.2. The term “valve body“ shall refer to all portions of the pressure containing envelope su
29、bject to inlet pressure and the term “spring housing“ shall refer to all portions of the pressure containing envelope subject to outlet or discharge pressure, Table I - Pressure-temperature rating. Nominal (PS plus or minus, shall not exceed 2 psi or 2 percent of the set pressure, whichever is great
30、er. # 3. 5. 5 Accumulation. - Valves shall be sized to pass the capacity specified (see 6.2) without permitting the inlet pressure to exceed the accumulation limit specified in figure 1, The valve shall show no signs of instability as a result of the accumulation test of 4.2. # 3. 5. 6 Blowdown. - V
31、alves shall operate satisfactorily with a blowdown setting not exceeding that permit- ted by figure 1. # 3. 5.7 Seat tightness. - With an inlet pressure at or above the minimum allowable blowdown pressure, the valve shall seat tightly. Allowable leakage under this condition shall not exceed 15 stand
32、ard cubic inches per hour per inch of seat diameter. # 3.5.8 Installation limitations. - Unless otherwise specified (see 6.2), valve operation shall not be ad- versely affected by an inlet pressure loss up to 25 percent of the relief valve blowdown, a discharge pressure buildup up to 10 percent of t
33、he set pressure, or both. Where the installation will subject the valve to greater piping restrictions, this information must be included in the ordering data. # 3. 5.9 Endurance. - The valve shall show no signs of damage to the seating surface, instability, no leakage in excess of the amount specif
34、ied in 3.5.7 and the set pressure shall remain within the tolerance specified in 3. 5.4 after subjection to the endurance test of 4.2. # 3.6 Mechanical shock and vibration. - Valves shall be designed to conform to the mechanical shock requirements of MIL-S-901 and the vibration requirements of MIL-S
35、TD-167. Requirements for shock and vibration testing shall be as specified (see 6.2). # 3.7 Marking. - “ # 3.7.1 Body markings. - All valve bodies shall have the nominal pressure rating and manufacturers name or trademark cast or forged integral with the valve body. When employed as a means of marki
36、ng, metal stamping shall be permitted on valve body surfaces that are not subjected to high stress in service. # 3.7.2 Identification plates, - An identification plate made of CmS, brass, or anodized aluminum, shall be permanently fastened to a part of the valve not subject to working pressure, and
37、shall contain the follow- ing data or a space therefor: (a) Manufacturers name or trademark. (b) Body material composition. - ,_ 6 F I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-225LI7D LIB W 7777706 027L1050 B m (c) Size of valve and rate
38、d capacity in SCFM at the applicable setting and accumulation, (d) Set pressure (psig) blowdown pressure (psig) and accumulation pressure (psig). (e) Range of set pressure adjustment availabe with installed spring, (f) Installation limitations of valve (maximum permissible inlet pressure loss and ma
39、ximum per- (g) Manufacturers model or part number and drawing number. (h) Space for nine digit CID number. missible back pressure buildup for which valve is designed). I 3.8 Drawings. - 3.8.1 Preliminary drawings. - Preliminary drawings which are sufficient to permit evaluation of the design and app
40、roval of materials shall be submitted with bids to the procuring activity, These drawings shall show the following: A sectional assembly of the valve and details of the seat, and disc and stem assembly. Finishes of all guiding and seating surfaces. Bill of materials listing specification, grade, con
41、dition, and any other data required to fully Installation dimensions, end connection detail, and clearance dimensions required for disas- Performance characteristics, estimated weight, and any limitations on installation. Note any previous shock, vibration, or First Article inspection approval. Tabu
42、lation of data for all springs required to meet adjustment limits specified in 3.5.1. Recommended assembly torques, or other equivalent procedures, for making up all joints and identify the properties of the materials proposed. sembly. threaded dimensions. # 3. 8.2 Final drawings. - Final drawings a
43、nd certification data sheets shall be submitted to the procuring activity for apprOVa1 within 60 days after date of contract. These drawings shall be in accordance with type 11 and III Of MIL-D-1000/2, except for extent of detail. Only the information required in 3.8.1 need be fur- nished for the ty
44、pe II drawings. The following data, in addition to that required in MIL-D-1000/2, shall be furnished for the type III drawings: (a) Valve description (b) Set pressure and adjustable set pressure range (c) Required capacity (d) “Rated capacity (at accumulation pressure) (e) Maximum allowable accumula
45、tion (f) Accumulation ( at rated capacity) (g) Maximum allowable blowdown (h) Blowdown (if adjustable, list adjustable blowdown range as well as actual blowdown setting) (i) Installation limitations of valve (maximum permissible inlet pressure loss and maximum per- missible back pressure buildup for
46、 which valve is designed). # 3.8.3 Limited rights legend. - When the Government has only limited rights in the data shown on the drawings, as determined by the contractural provisions regarding rights in technical data, the drawings furnished may be marked with the following restrictive legend: “Fur
47、nished under United States Government Contract No. . Shall not be either released outside the Government, or used, duplicated or disclosed in whole or in part for manufacture or procurement without the written permision of , except for (a) emergency repair or overhaul work by or for the Government w
48、here the item or process concerned is not otherwise reasonably available to enable timely performance of the work; or (b) release to a foreign Government, as the interests of the United States may require; provided that in either case the release, use, duplication or disclosure hereof shall be subje
49、ct to the forego- ing limitations. This legend shall be marked on any reproduction hereof in whole or in part. # 3.9 Manuals. - Manuals shall be furnished in accordance with type I of MIL-“15071. The quantity and distribution of manuals shall be as specified (see 6.2). The following, in addition to that required for type I of MIL-“15071, shall be included as part of the manual contents; (a) The approved engineering drawings for the valve (including certification data sheet). These Vawings shall
