1、AMSC N/A FSC 1660 MIL-PRF-7605G 26 August 2013 SUPERSEDINGMIL-PRF-7605F 20 November 1997 PERFORMANCE SPECIFICATION REGULATOR, OXYGEN, DEMAND, PRESSURE BREATHING, TYPE A-21 INCH-POUND Comments, suggestions, or questions on this document should be addressed to Oklahoma City Air Logistics Center/ENSDAA
2、, 3001 Staff Drive, Tinker AFB, OK 73145-3036 or emailed to af71tinker.af.mil. Since contract information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking
3、permitted without license from IHS-,-,-MIL-PRF-7605G 2 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a portable, demand, pressure breathing, oxygen regulator designated Type A-21. 2. APPLICABLE DOCUM
4、ENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 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 ensur
5、e the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and
6、 standards 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. FEDERAL SPECIFICATIONS BB-A-1034 - Compressed Air, Breathing (for guidance only) COMMERCIAL ITEM DESCRIPTIONS A-A-59503 -
7、 Nitrogen, Technical DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-6019 - Gages, Pressure, Dial Indicating, Low-Pressure Oxygen (for guidance only) MIL-DTL-7891 - Filler Valve, Aircraft Oxygen (Copies of these documents are available online at http:/quicksearch.dla.mil/ or from the Standardization Do
8、cument Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government drawings. The following other Government drawings form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the sol
9、icitation or contract. AIR FORCE DRAWINGS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7605G 3 44A23824 - Seat-Oxygen Mask to Regulator Connector 52B3903 - Cover Assembly, Portable Demand And Pressure Demand Oxygen Regulator (Copies of the
10、 above drawings are available from Oklahoma City Air Logistics Center/ENSDAA, 3001 Staff Drive, Tinker AFB, OK 73145-3036 or e-mailed to af71tinker.af.mil.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specifie
11、d, the issues of these documents are those cited in the solicitation or contract. ASME INTERNATIONAL ASME B1.20.1 - Pipe Threads, General Purpose (Inch) (ASME documents may be obtained online at http:/www.asme.org/ or from ASME International, Three Park Avenue, New York, New York 10016-5990, USA.) A
12、MERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables For Inspection By Attributes (ANSI/ASQ documents may be obtained online at http:/www.asq.org/ or from American Society for Quality, P.O. Box 3005 Milwaukee, WI 53201-3005 or 600 North Plankinton Avenue, Milwaukee, WI 53
13、203, USA.) ASTM INTERNATIONAL ASTM B117 - Salt Spray (Fog) Apparatus, Operating (ASTM documents may be obtained online at http:/www.astm.org or from American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) SAE INTERNATIONAL SAE AS5201 - Fitting End, Exter
14、nal Taper Pipe Thread, Design Standard SAE AS5202 - Port or Fitting End, Internal Straight Thread SAE AS8010 - Aviators Breathing Oxygen Purity Standard (SAE documents may be obtained online at http:/www.sae.org/ or from SAE International Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-00
15、01 USA.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, (except for related Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-
16、PRF-7605G 4 specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The regulators furnished under this specification shall be pr
17、oducts that are authorized by the qualifying activity for listing on the applicable Qualified Products Database before contract award (see 6.3). 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximu
18、m extent possible provided that the materials meets or exceeds the operational and maintenance requirements, and promote economically advantageous life cycle cost. 3.3 Materials. All materials shall be corrosion resistant or suitably treated to resist corrosion due to electrolytic decomposition, sal
19、t spray, and any other atmospheric conditions that may be encountered during operational use or storage (see 6.5). The use of toxic chemicals, hazardous substances, or ozone depleting chemicals shall be avoided, whenever feasible. 3.3.1 Safety specific materials. All materials used shall be capable
20、of operating safely in a pure oxygen environment without creating health or fire hazards (see 6.9). Cadmium shall not be used. 3.3.2 Elastomers. Elastomers, if used, shall be silicone-based (see 6.6 and 6.7). 3.3.3 Finish. Unless otherwise specified, the surfaces of the regulator shall not be painte
21、d. 3.4 Interface. 3.4.1 Dimensions. The regulator shall conform to dimensions shown in figures 1 and 2. 3.4.2 Pipe threads. Pipe threads shall be in accordance with ASME B1.20.1. 3.4.3 Bosses. Bosses shall conform to SAE AS5201 and SAE AS5202, as applicable. 3.4.4 Regulator inlet. Access to other co
22、mponents of the regulator shall not require removal of the inlet fitting. 3.4.5 Pressure gage. The regulator shall be provided with a pressure gage conforming to MIL-DTL-6019 (for guidance only). 3.4.6 Cover assembly. The regulator shall be provided with an outlet cover assembly conforming to Air Fo
23、rce Drawing 52B3903. 3.4.7 Oxygen mask connector. The regulator shall be provided with an oxygen mask connector Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7605G 5 conforming to Air Force Drawing 44A23824. 3.4.8 Filler valve. The regulato
24、r shall be provided with a filler valve conforming to M7891LM-4 in accordance with MIL-DTL-7891. 3.4.9 Pressure control knob. The markings on the pressure control knob shall be 1/8 inch in height conforming to figures 1 and 2. The markings shall be permanent and coated with luminescent material. 3.4
25、.10 Position indicator. The pressure control knob position indicator shall conform to figures 1 and 2. The indicator shall be 11/64 inch in diameter, coated with a luminescent material, and flush with the case. The markings shall be permanent. 3.5 Performance. 3.5.1 Pressure regulator. The regulator
26、 shall be a pressure demand type, and shall operate with oxygen having a pressure range of 50 to 500 pounds per square inch (psi). 3.5.2 Weight. The complete regulator shall not exceed 2.2 pounds. 3.5.3 Identification. The regulator shall be permanently and legibly marked with the following data (se
27、e 6.2). a. Nomenclature b. Type A-21 c. Serial number d. National stock number (NSN) e. Contract number f. Manufacturers name or CAGE code g. Manufacturers part number h. Date of manufacture 3.5.4 Inlet filter. A replaceable 200 mesh stainless steel screen shall be provided in the oxygen inlet for f
28、iltering (see 6.10). 3.5.5 Pressure control. The regulator shall have a four-position pressure control knob for selecting either demand operation (NORM position) or positive pressure operation (30M, 42M, and EMER positions). The pressure control knob shall not rotate between the NORM and EMER positi
29、ons without progressive movement through the other positions. Stops shall be provided for each position. 3.5.6 Pressure relief device. A replaceable pressure relief device shall be incorporated to vent the final stage pressure through the case to the atmosphere. The pressure relief device shall vent
30、 10 liters per minute (LPM) at a pressure no greater than 3 inches of mercury. The device leakage shall not exceed 0.01 LPM at 15 inches of water. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7605G 6 3.5.7 Flow suction characteristics. Whe
31、n in the demand operation mode (pressure control knob in NORM), the outlet suction required to obtain the specified outlet flow rate shall conform to table I (see 6.9). TABLE I. Flow suction characteristics Oxygen supply pressure (psi) Outlet flow rate at sea level (LPM) Maximum outlet suction (inch
32、es of water) 50 to 500 10 - 0.4 50 to 500 50 - 1.4 150 to 500 115 - 1.4 3.5.8 Pressure breathing characteristics. When in positive pressure mode (pressure control knob in 30M, 42M, or EMER), the outlet pressure flow characteristics for each pressure control setting shall conform to table II. The out
33、let pressure at each of the three flow rates listed in table II, column 3 may vary from the column 2 value up to the allowable pressure variation specified in the table. For example, with the pressure control knob at 30M and a 50 LPM flow rate, the outlet pressure shall be between 0.6 to 2.4 inches
34、of water (see 6.9). TABLE II. Pressure breathing characteristics Pressure control setting Outlet pressure at 10 LPM Allowable outlet pressure variation (inches of water) (inches of water) 0 LPM 50 LPM 90 LPM 30M 2.0 0.4 + 1.0 - 1.0 - 1.0 42M 6.0 0.5 + 1.5 - 1.5 - 1.5 EMER 13.0 1.0 + 2.0 - 2.0 - 2.0
35、3.5.9 Overload. The regulator shall be capable of withstanding a suction of 24 inches of water applied at the outlet for 2 minutes. 3.5.10 Outward leakage. With any pressure in the range of 0 to 17 inches of water at the outlet and the inlet plugged, the leakage through the regulator shall not excee
36、d 0.01 LPM with the pressure relief device capped. The leakage through the regulator with the pressure relief device uncapped shall not exceed 0.02 LPM. 3.5.11 Case leakage. The case, threads, and connections shall not leak. 3.5.12 Outlet leakage. With no demand applied at the outlet, the regulator
37、outlet flow shall not exceed 0.01 LPM. 3.5.13 Filler valve leakage. The filler valve shall not leak more than 0.001 LPM with an applied pressure of 500 psi. 3.5.14 Orientation. The regulator shall meet all performance requirements while mounted in Provided by IHSNot for ResaleNo reproduction or netw
38、orking permitted without license from IHS-,-,-MIL-PRF-7605G 7 any position. 3.5.15 Internal vibration and noise. The regulator shall be free from internal vibration or noise. 3.5.16 Reliability. The mean (breathing) cycles between failures (MCBF) shall be 300,000 cycles (see 6.9). 3.5.17 Operating l
39、ife span. The regulator shall have an operating life span of 800,000 cycles (see 6.9). 3.6 Interchangeability. All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. 3.7 Environmental conditions. a. Operating temperature range -65 to 160F b. Non-
40、operating temperature range -80 to 160F 3.8 Cleanliness. All surfaces shall be free of visible particulates (50 microns and larger), free of visible fluorinated lubricants, and free of hydrocarbon contamination to a level not greater than 3 milligrams per square foot (mg/ft2)(see 6.8). 4. VERIFICATI
41、ON 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2) b. Conformance inspection (see 4.3) 4.2 Qualification inspection. Unless otherwise specified in the acquisition documents (see 6.2), qualification inspe
42、ction shall be performed on three regulators. The qualification inspection shall consist of the tests in 4.6. Three regulators shall be subjected to the reliability test in 4.6.17. Two regulators shall be subjected to the life cycle test in 4.6.18. 4.3 Conformance inspection. Conformance inspection
43、shall include the individual tests in 4.3.1 and the sampling tests in 4.3.2. 4.3.1 Individual tests. The regulator shall be subjected to the following tests: a. Examination (see 4.6.1). b. Cleanliness (see 4.6.2). c. Flow suction characteristics (see 4.6.3). d. Pressure breathing characteristics (se
44、e 4.6.4). e. Outward leakage (see 4.6.5). f. Case leakage (see 4.6.6). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-7605G 8 g. Outlet leakage (see 4.6.7). h. Filler valve leakage (see 4.6.8). i. Pressure relief device (see 4.6.9). 4.3.2 Sa
45、mpling tests. Sampling tests shall be performed in accordance with the guidance in ANSI/ASQ Z1.4 at the normal inspection level. The sampling tests are: a. Overload (see 4.6.10). b. High temperature operation (see 4.6.11). c. Low temperature operation (see 4.6.12). d. Orientation (see 4.6.13). e. Hi
46、gh temperature exposure (see 4.6.14). f. Low temperature exposure (see 4.6.15). g. Reliability test (see 4.6.17). Samples shall be subjected to the test conditions of the reliability test for 9,000 cycles. The regulator shall then be subjected to flow suction characteristics and pressure breathing c
47、haracteristics tests. 4.4 Test conditions. Unless otherwise specified in the acquisition documents (see 6.2), all inspections shall be performed in accordance with the test conditions in this document. Unless otherwise specified in the test description, tests shall be conducted at: a. Ambient atmosp
48、heric conditions. b. Inlet gas pressure shall be 500 psi. c. The diaphragm of the regulator shall be in the vertical plane. d. The regulator shall not be subjected to vibration or tapping. e. The test gas shall be oxygen conforming to Type I of SAE AS 8010, water-pumped nitrogen conforming to Type I
49、, Class I, Grade B of A-A-59503, or water-pumped air conforming to BB-A-1034 (for guidance only). 4.5 Requirements cross-reference matrix. Table III provides a cross-reference matrix of the section 3 requirements tested or verified in the paragraphs below. Provided by IHSNot for ResaleNo reproduction or networki
