1、MIL-V-24740 48 H 7777906 O43b56 H ZNCH-POUND MIGV-24740(SH) 31 May 1990 MILITARY SPECIFICATION VALVE, SAFETY: BOILER, REMOIE PILOT OPERATED, FOR SHIPBOARD USE This spec$cation is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all depaments and
2、agencies of the Depai?inent of Defense, 1. SCOPE 1.1 Scope. This specification covers a high-performance boiler safety valve with a remote, hydraulic, non-steam flow pilot assembly, for steam drum and superheater service at working pressures of 600 and 1500 pounds per square inch (lb/in2). 1.2 Class
3、ification. Valves shall be provided in the classes and styles specified in 1.2.1 and 1.2.2, as specified in the contract or order (see 6.2). 1.2.1 Classes. Valves shall be of the following classes: a. Class 1 - 600 lb/inz service L b. Class 2 - 1500 ib/in2 service 1.2.2 Styles. Valves shall be of th
4、e styles specified in table I (see 3.3.1.2 and table II). 2. APPLICABLE DOCUMENTS 2,l Government documents, 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise Specified, the issues of these docu
5、ments are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this docume
6、nt should be addressed to: Commanding Officer, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 4820 DISTRIB
7、UTION STATEMENT A, Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SPECIFICATIONS FEDERAL PPP-F-320 MILITARY MIL-v-3 MIL-V-24740 48 777770b 043b857 T MILV-24740(SH) MIGS-1% MILS-901 MIGS-1222 MI
8、L-P-i5024 MILP- 15024/5 MIGR-1713 1 MILL- 19 140 STANDARDS FEDERAL FED-STD-H28 FED-STD-H28/1 FED-STD-H28/2 FED-STD-H28/4 Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade) and Cut Shapes Valves, Fittings, and Flanges (Except for Systems Indicated Herein); Packaging of Support Items, Acc
9、essories, and Kits, Mechanical; Packaging of Shock Tests, HI (High-Impact); Shipboard Machinery, Equipment, and Systems, Requirements for Studs, Bolts, Hex Cap Screws, Socket Head Cap Screws, and Nuts Plates, Tags, and Bands for Identification of Equipment Plates, Identification Rods and Powders, We
10、lding, Surfacing Lumber and Plywood, Fire-Retardant Treated Screw-Thread Standards for Federal Services Section 1; Screw-Thread Standards for Federal Services, Nomenclature, Definitions, and Letter Symbols for Screw Threads Section 2; Screw-Thread Standards for Federal Services, Unified Inch Screw T
11、hreads - UN and UNR Thread Forms Section 4; Screw-Thread Standards for Federal Services, Controlled Radius Root Screw Threads, UNJ Symbol 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-0 MIL-V-24740 44 U 9999906 04365 L m FED-STD-H28/6 Section 6;
12、Screw-Thread Standards for Federal Services, Gages and Gaging for Unified Screw Threads - UN and UNR Thread Forms FED-STD-H28/19 Section 19; Screw-Thread Standards for Federal Services, Miscellaneous Threads Section 21; Screw-Thread Standards for Federal SeMces, Metric Screw-Threads FED-STD-H28/21 M
13、ILITARY MIGSTD-167-1 Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited) Welding and Brazing Procedure and Performance Qualification MIL-SID-248 MIL-STD-278 Welding and Casting Standard MIL-STD-777 Schedule of Piping, Valves, Fittings, and Associate
14、d Piping Components for Naval Surface Ships (Unless otherwise indicated, copies of federal and military specifications and standards are available from the Naval Publications and Forms Center, (AITN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 21.2 Other Government documents. The follow
15、ing other Government documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSHIPS 5000-S5103-841622 Valves, Boiler Safety, Dimensional Standard for 300, 600, and 1500 Psi
16、 Nominal Pressure NAVSHIPS 250-660-30 A Guide for Design of Shock Resistant Naval Equipment (Application for copies should be addressed to the Naval Publications and Forms Center, (AIT“: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 3 Provided by IHSNot for ResaleNo reproduction or networ
17、king permitted without license from IHS-,-,-MIL-V-24740 48 I 9999906 OV36859 3 MIL-V-24740( SH) 22 Non-Goveniment publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are tho
18、se listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN NATIONAL, STANDARDS INSTITUTE (ANSI) B16.5 Pipe Flanges and Flanged Fittings; (DO
19、D adopted) (Application for copies should be addressed to the American National Standards Institute, Inc., 1430 Broadway, New York, NY 10018.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) Boiler and Pressure Vessel Code Section I. (Application for copies should be addressed to the American Societ
20、y of Mechanical Engineers, 345 East 47 Street, New York, NY 10017.) AMERICAN SOCIETY FOR Tl3ZI“IN AND MATERLQLS (ASTM) A 269 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service; (DOD adopted) A 351 A 479 Standard Specification for Steel Castings, Aust
21、enitic, for High-Temperature Service; (DOD adopted) Standard Specification for Stainless and Heat-Resisting Steel Bars, and Shapes for Use in Boilers and Other Pressure Vessels; (BOD adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Str
22、eet, Philadelphia, PA 19103.) (Non-government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 4 Provided by IHSNot for ResaleNo rep
23、roduction or networking permitted without license from IHS-,-,-MIL-V-24740 48 m 7777706 0436860 T MILV-24740( SH) 23 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document
24、, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQ- 3.1 Fmt articleq When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.5), in accordance with 4.3. 32 Material 3.21 General. Materials incorporated into the
25、se valve assemblies shall be as specified herein. Materials used in the design and construction of components shall be as shown in table I. TABLE I. Materials. Part Bonnets Nozzles and disks, except superheater applications Nozzles and disks, super- heater Threaded fasteners Unloader valve flanges P
26、ilot valve Tubing and tubing couplings Material Corrosion-resisting steel Corrosion-misting steel Hard surfaced Stellite seating surfaces Chromium-molybdenum vanadium steel Steel Corrosion-resisting steel Hard stainless steel Applicable documents ASTM A 351, CFB or CEBC, ASME Boiler and Pressure Ves
27、sel Code ASTM A 351, CF8 or ASTM A 479, grade 304, ASME Boiler and Pressure Vessel Code MIL-R-17131, type MIL-RCoCr-A and hard surfacing requirements of MIL-STD-24 MIL-STD-248 Bolts to B16 or better, nuts to grade 4 or better of MILS-1222 ANSI B16.5 ASTM A 351, CF8 or ASTIM A 479, grade 304, ASME Bo
28、iler and Pressure Vessel Code ASTM A 269 3.2.1.1 Springs. Springs shall be of non-corrosive materials that shall retain their properties under the service conditions specified herein (see 3.4.2.4 and 3.4.2.5). 5. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
29、om IHS-,-,-MIL-V-24740 48 7777706 04368bL L W MILV-24740( SH) 321.2 Unloader valve. The unloader valve parts shall be made of the material specified in table I. Equivalent or better materials proposed by the contractor will be considered for acceptance by the acquiring activity. 3213 Pilot assembly.
30、 The pilot assembly may be subjected to continuous blowdown and therefore shall be constructed and its materials selected for withstanding full boiler water pressure and temperature in accordance with MIGSTD-777 (see ASTM A 351, CF8, or ASTM A 479, grade 304, MME Boiler and Pressure Vessel Code). 32
31、2 Recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the i
32、ntended use. The term “recovered materials“ means materials which have 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 allo
33、wed under this specification unless otherwise specifically specified. 3.23 Material identincation and control System fluid pressure retaining parts and the fas- teners that provide the clamping force to retain these parts shall be subjected to strict material identification and control. The contract
34、or shall assure the identification of chemical and physical properties of these parts by maintaining continuous traceability thereof to their original heat or batch. These parts shall be marked to relate the part to the material chemical composition and physical properties documentation. Nonmetallic
35、 materials and such items as setting or adjusting (threaded) parts 1/2-inch diameter or less shall be excluded om this requirement (see 6.3). 33 Construction. Construction of the safety valves shall be in accordance with 3.3.1 through 3.3.5.4. 33.1 Characteristics. Characteristics shall be in accord
36、ance wjth 3.3.1.1 through 3.3.1.4. 33.1.1 Configuration. The boiler safety valve system covered by this specification shall include the following general features, as defined hereinafter: a. b. A safety valve (the unloader valve) for installation at the superheater outlet and the steam drum A hydrau
37、lic, non-steam flow pilot assembly for continuously sensing boiler drum pressure; for actuating, automatically, the lifting of the unloader valve for blowdown; and for repressurization for safety valve closure A boiler water storage canister, with filter, in the water supply line to the pilot valve
38、assembly Means for manually actuating lifting (popping) and reseating of the safety valve The above items, other than the unloader valve, shall be located away from the vicinity of the boiler to permit ease of maintenance. c. d. e. 6 Provided by IHSNot for ResaleNo reproduction or networking permitt
39、ed without license from IHS-,-,-MIL-V-24740 48 7777706 0436862 3 W MIGV-24740(SH) Other appurtenances, to include a manually operated three-way valve and the self-contained piping between pilot assembly components, as necessary for satisfactory performance, shall be provided. Terminal piping and tub
40、ing connections for the sensing line, the water inlet line to the canister, and the actuating line shall be socket-welded ends located sufficiently away from their units in a convenient location far shipbuilder attachment of piping, as necessary. These lines shall contain suitable makanical (takedow
41、n) fittings near the socket-welded ends. 33.12 DiPinemiom- NAVSHIPS 500-S5603-8$1622 is referenced primarily to show general configuration of the uriloader valve. The size of the safety (unloader) valve is the size of the inlet flange shown in table II (which is the nominal size of the inside diamet
42、er of the inlet opening at the flange face). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-247i.10 i.18 W 0b 043b8b3 5 MILV-24740( SEI) 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-
43、V-24740 48 9 7777706 0436864 7 MILV-Z4740( S.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24740 48 I 777770b OY3bbb O Provided by IHSNot f
44、or ResaleNo reproduction or networking permitted without license from IHS-,-,-M1L-V-24740( SH) 33.13 Pressure- Unless otherwise specified (see 6.2), safety valves shall be designed and constructed to one of the standard pressures specified in 3.3.1.3.1 and 3.3.1.3.2, as applicable. 33.13.1 600 pound
45、s (nominal) standard Valves for use on boilers having drum pressures of 326 lb/in2 to 675 lb/in2 (for which the safety valve popping pressure may exceed 675 lb/in2, but will not exceed 735 lb/in2) shall be designed for a pressure of at least 735 lb/in2 and an operating temperature of at least 875 de
46、grees Fahrenheit (OF). 33.1.3.2 1500 pounds (nominal) standard Valves for use on boilers having drum pressures of 676 to 1600 lb/in2 for which the safety valve popping pressure may exceed 1600 lb/in2, but will not exceed 1700 lb/in2 shall be constructed for a pressure of at least 1700 lb/in2 and an
47、operating temperature of at least loo0 OF. 33.1.4 Shut down and start up. If maintenance requiring disassembly is required, means shall be provided to relieve all pressure-containing pockets without creating a hazard to personnel. If lay up or maintenance on the valve or its boiler can adversely aff
48、ect its performance by loss of primary fluid, or other causes, the design and construction shall incorporate means for properly placing the system into service, when necessary. Venting or other means used shall not constitute a hazard to personnel. Such means used shall be foolproof to eliminate the
49、 possibility of adversely affecting normal service. Items such as petcocks shall be unacceptable. 3.3.2 Shipboard environmental conditioas. Safety valves shall be designed and constructed to perform their required functions in a reliable manner when installed and operated on board Navy ships under the following shipboard arrangements and environme
