1、 AMSC N/A FSC 1660 MIL-DTL-19803G 05 February 2007 SUPERSEDING MIL-C-19803F 24 March 1982 DETAIL SPECIFICATION CONVERTER, LIQUID OXYGEN, 10-LITER, GCU-24A/A Reactivated after 05 February 2007 and may be used for new and existing designs and acquisitions. This specification is approved for use by all
2、 Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of aircraft converter, GCU-24A/A, used for storing and pressuring 10 liters of liquid oxygen. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sect
3、ions 3 and 4 of this specification. This section does not include documents cited in other sections of this specification 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 me
4、et all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent speci
5、fied herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Air Warfare Center Aircraft Division, Code 491000B120-3, Highway 547, Lakehurst, NJ 08
6、733-5100 or emailed to thomas.omaranavy.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil.INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
7、ense from IHS-,-,-MIL-DTL-19803G 2 FEDERAL STANDARD FED-STD-595 - Colors Used in Government Procurement: Color number: 14187 COMMERCIAL ITEM DESCRIPTIONS A-A-58092 - Tape, Antiseize, Polytetrafluorethylene A-A-59503 - Nitrogen, Technical DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-9050 - Valves, Ox
8、ygen, Pressure Relief, Aircraft MIL-DTL-25516 - Connectors, Electrical, Miniature, Coaxial, Environment Resistant Type, General Specification for MIL-PRF-25567 - Leak Detection Compound, Oxygen Systems MIL-PRF-25961 - Valve, Fill-Buildup-Vent, Liquid Oxygen Converter, CRU-50/A MIL-PRF-27210 - Oxygen
9、, Aviators Breathing, Liquid and Gas DEPARTMENT OF DEFENSE STANDARDS MIL-STD-129 - Military Marking for Shipment and Storage MIL-STD-130 - Identification Marking of U.S. Military Property MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equ
10、ipment MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 - Dissimilar Metals MIL-STD-1916 - DoD Preferred Methods for Acceptance of Product Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 3 MS22068
11、 - Coupling Assemblies, Quick Disconnect, Aircraft Liquid Oxygen Systems. (Inactive for New Design) MS90341 - Mounting Bracket, Configuration, Mating Portion for 5 and 10 Liter Liquid Oxygen Converters. (Inactive for New Design) DEPARTMENT OF DEFENSE HANDBOOK MIL-HDBK-781 - Reliability Test Methods,
12、 Plans, and Environments for Engineering Development, Qualification, and Production (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA
13、 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ-Z1.4 - Sampling Proced
14、ures and Tables for Inspection for Attributes. (DoD Adopted) (Copies of this document are available from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203-4606 or http:/www.asq.org.) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) SAE-ARP1176 - Oxygen System and Component Clea
15、ning and Packaging. (DoD Adopted) (Copies of this document are available from www.sae.org or SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this
16、document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 4 3. REQUIREMENTS 3.1 Qualification
17、. The converter furnished under this specification shall be a product that is authorized by the qualifying activity for listing on the applicable qualified products lists before contract award (see 4.1 and 6.3). 3.2 First article. When specified (see 6.2), the converter shall be subjected to first a
18、rticle inspection in accordance with 4.3 and 6.4. 3.3 Materials. Materials shall conform to applicable specifications and shall be as specified herein and on applicable drawings. Materials which are not covered by specifications, or which are not specifically described herein, shall be of the best q
19、uality, of the lightest practicable weight, and for the purpose intended. 3.3.1 Metal parts. All metals parts shall be of a corrosion-resistant material or treated in a manner to render them resistant to corrosion. 3.3.1.1 Dissimilar metals. Unless protected against electrolytic corrosion, dissimila
20、r metals shall not be used in intimate contact with each other. Dissimilar metals are specified in MIL-STD-889. 3.3.2 Nonmetallic materials. Any nonmetallic material that is affected by continued use with oxygen shall not be used. 3.3.2.1 Age. Elastomer components, except silicon, shall be not great
21、er than 12 months old from the date of manufacture to the date of delivery to any Government Service or to any airframe or accessory manufacturer. 3.3.3 Protective treatment. When materials are used in the construction of the converter that are subject to deterioration when exposed to environmental
22、conditions likely to occur during service usage, they shall be protected against such deterioration in a manner that shall in no way prevent compliance with the performance requirements (see 3.5) of this specification. Protective coating which might crack, chip or scale during normal service life or
23、 under extremes of environmental conditions shall not be used. 3.4 Design and construction. The design and construction shall be in accordance with figures 1, 2, 3, and 4. The converter shall include provisions for filling with liquid oxygen when either installed or not installed in the aircraft and
24、 for being transported in the filled condition. The converter shall consist of the following major components: Container Container outer shell Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 5 Sensing element Electrical connectors Comb
25、ination fill-buildup-vent valve Relief valve Secondary overpressure safety device Pressure control valve Mounting base 3.4.1 Components and hardware. The design of the components and associated hardware shall be such that the assembly/disassembly of the converter can be accomplished without the use
26、of any special tools. All components and hardware shall be designed, protected, or positioned to prevent chafing due to normal service, shipping, and handling environments. Tube assemblies and warming coils shall be a minimum of 0.0625 inch (1.58 mm) from the container outer shell. 3.4.2 Container.
27、The container shall be designed to contain a minimum of 10 liters of liquid oxygen measured at 1 atmosphere (101.3 kPa). The container shall be designed such that in case of contamination the container can be easily and completely cleaned by Overhaul and Repair servicing personnel and then returned
28、to service status. If the container employs a vacuumized space as insulation, it shall be provided with a functional adsorbent. The container shall be baffled to prevent direct exit of liquid oxygen through the vent line during initial stages of the filling operation. 3.4.3 Container outer shell. Th
29、e outer shell of the container shall be provided with a rupture point having not less than a 0.375 inch (9.525 mm) diameter escape area. Pressure required to rupture the escape area shall be at least 20 percent less than the burst pressure of the outer container shell. The rupture point shall be loc
30、ated in such a position that in case of rupture the danger to personnel shall be at a minimum. 3.4.4 Sensing element. The sensing element shall consist of an electrical capacitance having characteristics that provide for a linear relationship between electrical capacitance and volume sensed. The ele
31、ment shall be designed for use with indicator system components to indicate the amount of liquid oxygen in the liquid oxygen container. The sensing element shall be an integral part of the container and shall be permanently installed. The sensing element shall not be electrically grounded to the con
32、tainer. The interference limits shall be in accordance with MIL-STD-461. 3.4.4.1 Electrical connectors. The high impedance sensing elements lead shall be terminated in a connector conforming to MIL-DTL-25516, B polarity. The low impedance lead shall be terminated in a connector conforming to MIL-DTL
33、-25516, E polarity. The connectors shall provide waterproof connection. The connectors shall be provided with dust caps connected to the converter by a chain or linkage arrangement. Storage clips shall be provided for these caps near the electrical connectors. Provided by IHSNot for ResaleNo reprodu
34、ction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 6 3.4.5 Combination fill-buildup-vent valve. The combination fill-buildup-vent valve, as a component only, shall meet the performance requirements of MIL-PRF-25961. 3.4.6 Relief valve. The relief valve, as a component only, sh
35、all meet the performance requirements of MIL-PRF-9050, Type II. 3.4.7 Pressure control valve. The pressure control valve shall be a pressure closing (shut-off) valve. 3.4.8 Check valve. The check valve, if used, shall be spring loaded. 3.4.9 Test port. A test port with a cap and retaining chain shal
36、l be incorporated in the tubing and located in such a manner that the entire converter assembly can be pressurized through the test port. 3.4.10 Secondary overpressure safety device. A secondary overpressure safety device, incorporating a frangible safety burst disc, shall be embodied in the plumbin
37、g of the converter. The location of the safety device shall be such that it will ensure rapid dumping of the head pressure from the converter in the event the pressure relief valve fails to open. The safety device shall contain a visible means of ascertaining the condition of the frangible safety bu
38、rst disc without disassembly. 3.4.11 Shock mounts. Shock mounts and sway clearance due to shock mounting shall be within the specified envelope. 3.4.12 Antiseize tape. Antiseize tape shall be used on all male pipe thread fittings. Antiseize tape shall conform to and shall be applied as specified in
39、A-A-58092. Tape shall not be used on flare tube fittings, straight threads, coupling sleeves, or on the outer side of tube flares. None of the tape shall be allowed to enter the inside of a fitting. 3.4.13 Mounting base. The mounting base shall conform to the configurations and dimensional requireme
40、nts on figure 4. 3.5 Performance. 3.5.1 Permanent volumetric expansion. The permanent volumetric expansion of the inner vessel shall be not greater than 10 percent of the volumetric expansion at the test pressure when tested as specified in 4.6.2. There shall be no evidence of mechanical or material
41、 failure. 3.5.2 Pressure tests. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 7 3.5.2.1 Inner vessel. The inner vessel shall show no evidence of material failure when tested as specified in 4.6.3.1. 3.5.2.2 Complete assembly. The com
42、plete converter assembly shall show no evidence of system leaks except as noted herein when tested as specified in 4.6.3.2. 3.5.3 Filling time. The time required to fill the converter, which shall have been initially at room temperature, shall be not greater than 6 minutes when tested as specified i
43、n 4.6.4. 3.5.4 Buildup time. The time required to attain the buildup pressure of 70 psig (482 kPa) shall be not greater than 5 minutes when testing as specified in 4.6.5. 3.5.5 Dielectric strength. The leakage current of the converter sensing element shall be not greater than 1.0 milliampere when me
44、asured as specified in 4.6.6. 3.5.6 Insulation resistance. The insulation resistance of the converter sensing element shall be 10 megohms between each electrode and converter ground and be not less than 20 megohms between the electrodes when measured as specified in 4.6.7. 3.5.7 Sensing element cali
45、bration. 3.5.7.1 Empty converter. The capacitance of the sensing element shall be 123.5 + 2 picofarads (pf) when tested as specified in 4.6.8.1. 3.5.7.2 Filled converter. The capacitance of the sensing element shall be between the maximum and minimum limits as derived from the following equations wh
46、en tested as specified in 4.6.8.2. Cmax = (2.33 x W) + 124.7 Cmin = (2.25 x W) + 122.3 C = Capacitance in pf W = Exact weight of the liquid oxygen in pounds at the test point. 3.5.8 Relief valve test. The relief valve shall operate between 100 and 120 psig (689 and 827 kPa) and shall allow a minimum
47、 flow of 80 liters/min (Lpm) (0.080 cubic meters/min.) at 120 psig (827 kPa) through the valve when tested as specified in 4.6.9. 3.5.9 Evaporation loss test. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19803G 8 3.5.9.1 Initial evaporatio
48、n loss in vented condition. The converter shall not have a weight loss greater than 3.0 pounds (1.36 kg) for a 24-hour period with the unit vented to the atmosphere when tested as specified in 4.6.10.1. 3.5.9.2 Second evaporation loss in vented condition. The converter shall meet the requirements sp
49、ecified in 3.5.9.1 when tested as specified in 4.6.10.2. 3.5.9.3 Evaporation loss in pressurized condition. The converter shall not have a weight loss greater than 7.5 pounds (3.375 kg) for a 48-hour period when tested as specified in 4.6.10.3. 3.5.10 Secondary overpressure safety. 3.5.10.1 Secondary overpressure safety (standard temperature). The secondary overpressure safety device sh
