1、 MIL-DTL-25bbbF = 99999Ob 2005730 006 LNCH-POUNDI MIL-DTL-25666F (USAF) 15 September 1995 SUPERSEDING 03 June 1980 MIL-C-25666E (USAF) DETAIL SPECIFICATION CONVERTER, LIQUID OXYGEN, CAPACITANCE TYPE GAUGING, GENERAL SPECIFICATION FOR This specification is approved for use by the Department of the Ai
2、r Force and is available for use by a11 Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the genera1 requirements for liquid oxygen converters that will store liquid oxygen on board an aircraft and that will convert the liquid oxygen to gas as requ
3、ired to supply the oxygen regulators. It includes converters of various capacities and operating pressures with either integral warming coils or separate aircraft installed warming coils. Provisions for quick-change installation in aircraft or permanent installation in aircraft are included. 1.2 Cla
4、ssification. Classification of the converters are as follows: Capacitv Liters Associated meci fication IYW MIL-DTL-25666/1 GCU-2A/A 10 MIL-DTL-2566612 GCU31A 10 MIL-DTL-2566613 GCU- 1 O/A 10 MIL-DTL-25 666/4 GCU- 12A/A 5 MIL-DTL-25666/5 GCU- 1 7/A 25 MIL-DTL-25666/6 GCU-20/A 75 MIL-DTL-2566617 ME-3
5、25 Omrating pressure PSI 70 70 300 70 300 300 300 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are needed to meet the requirements specified in sections 3, 4, and 5 of this specification. This section does not include documents cited in other sections of this specificati
6、on or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3,4, and 5 of this specification, whether or not they are lis
7、ted. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: OC-ALCTICLA, 3001 Staff Drive, Tinker AFB, OK 73145- 3037 by using the self-addressed Standardization Document Improvement Proposal D Form 14
8、26) appearing at the end of this document or by letter. AMSC NIA FSC 1660 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling Services flIL-DTL-25bbbF W 0b 20057LL T42 MIL-DTL-25666F (USAF) 2.2 Governmdo cuments. 2.2.1 Spec ifications an
9、d standarh. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index for Specifications and Standards (DODISS) and supplement ther
10、eto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL BB-N-411 Nitrogen, Technical DEPARTMENT OF DEFENSE MIL-P-7 105 MIL-S-7742 MIL-V-9050 MIL-F-18264 MIL-D- 19326 MIL-C-255 16 MIL-L-25 567 MIL-1-25645 MIL-V-25961 MIL-0-272 1 O MIL-T-27730 MIL-V-3 820 1 Pipe Threads, Taper, Aeronautical N
11、ational Form, Symbol ANPT, General Screw Threads, Standard Optimum Selected Series: General Requirements for Valves, Oxygen, Pressure Relief, Aircraft Finishes: Organic, Weapons System, Application and Control of Design and Installation of Liquid Oxygen Systems in Aircraft, General Connectors, Elect
12、rical, Miniature, Coaxial, Environment Resistant Type, Leak Detection Compound, Oxygen Systems Indicator, Liquid Oxygen Quantity, Capacitance Type, General Specification Valve, Fill-Buildup-Vent, Liquid Oxygen Converter CRU-SO/A Oxygen, Aviators Breathing, Liquid and Gas Tape, Antiseize, Polytetrafl
13、uoroethylene, with Dispenser Valve, Filler, Liquid Oxygen, Female CRU-59E Requirements for Specification for General Specification for for STANDARDS FEDERAL FED-STD-595 Colors Used in Govemment Procurement DEPARTMENT OF DEFENSE MIL-STD-100 MIL-STD-130 MIL-STD-72 1 MIL-STD-78 1 MIL-STD-8 10 MIL-STD-8
14、89 MIL-STD-1359 MS33583 MS33584 Engineering Drawing Practices Identification Marking of US Military Property Definitions of Terms for Reliability and Maintainability Reliability Testing For Engineering Development, Qualification and Production Environmental Test Methods and Engineering Guidelines Di
15、ssimilar Metais Cleaning Methods and Procedures for Breathing Oxygen Equipment Tubing End Double Flare, Standard Dimensions for Tubing End Standard Dimensions for Flared t (Unless otherwise indicated, copies of the above specifications, and standards are available ftom the Standardization Documents
16、Order Desk, Building 4D, 700 Robbins Ave, Philadelphia, PA 191 1 1-5094) 2 Licensed by Information Handling ServicesMIL-DTL-25bbbF 9Ob 20057112 989 MIL-DTL-25666F (USAF) 2.2.2 Other Government doc uments. drawings. and publications. The following other Government documents, drawings, and publication
17、s form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA) NHB 8060.1 Office of Safety and Mission Quality Flammability, Odor, Offgassing, and Compatibility Requiremen
18、ts and Test Procedures for Materials in Environments that Support Combustion (Application for copies should be addressed to the National Aeronautics and Space and Administration (NASA), NASA Headquarters, Technical Standards Division, Code QE, Washington, DC 20546) 2.3 Non-Government publication. Th
19、e following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in th
20、e DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D25 12 Compatibility of Materials with Liquid Oxygen (Impact Sensitivity Threshold and Pass-Fail Technique), Test Method for ASTM B117 Standard Practice for Operating
21、Salt Spray (Fog) Testing Apparatus (Application for copies should be addressed to the American Society For Testing Materials, 1916 Race St, Philadelphia, PA 19103-1 187) METALS AND ALLOYS IN THE UNIFIED NUMBERING SYSTEM (UNS) UNS S30403 Austenitic Cr-Ni Stainless Steel (Low Carbon) (Application for
22、copies should be addressed to the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096 2.4 Order of hecedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated specifications, specification shee
23、ts, or MS standards), the text of this documents takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Associated mecification. The individual item requirements shall be as specified herein a
24、nd in accordance with the applicable associated specification. In the event of any conflict between the requirements of this specification and the associated specification, the latter shall govern. 3.1.1 Qualification. The converters furnished under this specification shall be products which are aut
25、horized by the qualifjing activity for listing on the applicable qualified products list at the time set for opening of bids (see 4.2 and 6.3). 3.2 Ma-io r comDonents. The major components of the converters shall be as follows: a. Liquid oxygen container (see 3.5.1). 3 Licensed by Information Handli
26、ng Services MIL-DTL-25bbbF 0b 2005733 835 MIL-DTL-25666F (USAF) b. Capacity sensing element and connections (see 3.5.2). c. Fill-buildup-vent valve (applicable to converters with provisions for quick-change installations)(see 3.5.3). d. Pressure closing valve (see 3.5.4). e. Pressure relief valve (s
27、ee 3.5.5). f. Overpressure safety device (see 3.5.6). g. Mounting provision and system connections (see 3.5.7). 3.3 Materials. Materials shall conform to applicable specifications as identified herein. Materials that are not covered by specifications shall be suitable for use in liquid oxygen system
28、s. The use of reclaimed materials shall be encouraged to the maximum extent possible without jeopardizing the function of the end item. 3.3.1 Metals. Metals shall be corrosion-resistant steel or nonferrous metal that has been treated to resist corrosion. Metallic materials that are subject to corros
29、ion in oxygen, salt air, or any other atmospheric conditions likely to occur during the usage of the converter shall be protected against such corrosion in a manner that will not in any way prevent compliance with the performance requirements of this specification. 3.3.1.1 Dissimilar metals. Unless
30、protected against electrolytic corrosion, dissimilar metals as defined in MIL- STD-889 shall not be used in intimate contact. 3.3.1.2 Nonmetallicmatenals. Nonmetallic materials shall have the physical properties required for the converter to function, without being adversely affected, while exposed
31、to cryogenic temperatures. The contractor shall be responsible for the evaluation of materials for their suitability in each application. The contractor may evaluate materials in accordance with either ASTM D25 12 or NASA NHB 8060.1. 3.3.2 Exterior coating. After the cleaning specified (see 3.9) has
32、 been completed, the assembled liquid oxygen container and any parts of the other components that are to be painted shall be coated with a primer compatible with the finish to be applied. One or more coats of durable, high quality paint shall be applied as required to achieve a smooth protective fin
33、ish free of cracks, checks, or runs. The color of the topcoat shall conform to 14187 of FED- STD-595. Organic finishes shall be applied in accordance with MIL-F-18264. 3.4 Desim and constru ction. Each converter shall be designed and constructed in accordance with the applicable associated specifica
34、tion (see 1.2). 3.4.1 Tubing- . All openings of the finished converter shall be capped or plugged to prevent thread damage and to prevent the entry of moisture and foreign matter. Aluminum tubing that interconnects components shall be double flared to conform to MS33583. Tube fittings and pipe threa
35、d bosses for mating the converter to aircraft lines shall be corrosion-resistant steel. Corrosion-resistant steel tubing shall be single flared to conform to MS3 3 584. 3.4.2 Antiseize tape. Antiseize tape that conforms to MIL-T-27730 shall be used on tapered male pipe thread fittings. The antiseize
36、 tape shall not be used on the straight threads or the tubing fittings. Particles of the antiseize tape shall not be allowed to enter the inside of plumbing lines. 3.4.3 Beck valves and flow restructures . Check valves and flow restrictors may be used in the circuit as required for function. Check v
37、alves and flow resricors shall be spring loaded as necessary to avoid any possibility of entrapment of liquid oxygen in a dead end circuit. 3.4.4 Dimensions. The dimensions of the converter shall be as specified in the applicable associated specification. 4 Licensed by Information Handling ServicesM
38、IL-DTL-25bbbF m 9999906 2005714 75L m MIL-DTL-25666F (USAF) 3.4.5 us. Screw threads shall be in accordance with MIL-S-7742. Pipe threads shall be in accordance with MIL-P-7 105. 3.4.6 Weight. The weight of the complete converter, including the converter portion of any quick disconnects, shall not ex
39、ceed the weight specified in the applicable associated specification. 3.5 Details of components. 3.5.1 Liauid oxygen container. The liquid oxygen container shall be a double-walled, vacuum-insulated container that will limit heat transfer and maintain a near perfect permanent vacuum. The vacuum betw
40、een the inner wall (inner vessel) and the outer wall (outer vessel) shall contain a getter (see 6.5) that will not propagate fne or explosion in the event of a direct hit by an incendiary projectile. The fill line entrance to the storage space of a liquid oxygen container shall not allow the filling
41、 stream to impinge on the vent outlet opening. The inner vessel and the outer vessel shall be fabricated utilizing manufacturing processes and selected corrosion-resistant steels that conform to S30403 to assure limited chromium carbide grain formulation thereby reducing susceptibility to stress cor
42、rosion. The outer vessel shall have a rupture area that is positioned or shielded to minimize the danger to nearby personnel. 3.5.2 Capacity sensing element and connections. A capacity sensing element that will provide a linear incremental increase in electrical capacitance proportional to the liqui
43、d oxygen quantity shall be incorporated within the liquid oxygen container. The capacity sensing element shall function with gage system components that conform to MIL-1-25645. The two leads from the capacity sensing element shall terminate in electrical receptacles. The electrical receptacle for th
44、e high impedance lead shall conform to style B of MIL-C-25516. The electrical receptacle for the low impedance lead shall conform to style E of MIL-C-25516. The electrical receptacles of the converters shall be provided with storage caps that preclude contamination of the receptacle terminals during
45、 transit and storage. 3.5.3 Fill-buildupvent valve, When the applicable associated specification specifies a fill-buildup-vent valve as a component of the converter, the fill-buildup-vent valve shall meet the requirements specified in MIL-V-25961. The fill-buildup-vent valve shall be located so that
46、 it will interface and provide the hand operation clearance necessary to accomplish normal filling actions with a CRU-59E female filler valve that conforms to MIL-V-38201. 3.5.4 Pressure closinz valve. The pressure closing valve shall be actuated by a leakproof metal bellows as the pressure responsi
47、ve element. The adjustment feature of the pressure closing valve shall be secured in place by safety wire or sealant, or both, to prevent vibration induced changes. 3.5.5 Pressure relief valve. The pressure relief valve or valves, shall meet the performance requirements of MIL-V-9050. The type of pr
48、essure relief valve or valves identified in the applicable associated specification shall be utilized. 3.5.6 Overpressure sa fety device. A secondary overpressure device shall be incorporated in the plumbing of the converter at a location to insure rapid dumping of the head pressure from the convert
49、er in the event the pressure relief valve fails to open. 3.5.7 fis. The mounting provisions for either quick-change or fxed installation type converters and their system connections shall be as specified in the applicable associated specification. 3.6 Interchanpeability. Ail parts having the same manufacturers part numbers shall be dimensionally and hnctionally interchangeable. The item identification and part number requirements of MIL-STD- 1 O0 shall apply. 3.7 Markinp. 3.7.1 r du t. Each converter shall be permanently identified as specified in MIL-STD-1
