1、MIL-C-4752E q4 m 9797906 0207706 5 M 1. SCOPE I INCEI-POUND 1 MIL-C-4952E (USAF) 28 NOV 88 SUPERSEDING MIL-C-4952D (USAF) 21 October 1964 MILITARY SPECIFICATION CARTRIDGES, DESICCANT, DEHYDRATOR This specification is approved for use within the Department of the Air Force and is available for use by
2、 all Departments and Agencies of the Department of Defense 1.1 - ScoDe. This specification covers two types of dehydration cartridges. 1.2. Classification. Cartridges shall be of the following - types as specified (See 6.2) : TYPES Type I - MA-1 Type II - MA-2 2. APPLICABLE DOCUMENTS 2.1 Government
3、documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specification
4、s and Standards (DODISS) and supplement thereto, cited in the solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be use in improving document should be addressed to: WR-f uC/mIRFW. Robins AFB. GA 31098 by using the self-addressed Standardizatio
5、n J Document Improvement Proposal (DD Fo The container body shall be fabricated from type I, grade 3, 107-pound base weight (pounds per base box) tinplate, having a tin coating Of 1.05 pounds per base box minimum average weight test value in accordance with QQ- I T-425. I 4 Provided by IHSNot for Re
6、saleNo reproduction or networking permitted without license from IHS-,-,-cl cl -4 d W O 4 m O +I O .-I MIL-C-4952E (USAF) W cl ra 9 O R “_ - .“ “ m W R 7 S z H R a a U M H cn W a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4952E (USAF) 3.7.
7、1.2 Seams. The body joint shall be an outside lock seam soldered the enti.re length with tin-lead solder, or welded (see 3.7.1.7). The end-to-body seam shall be a double seam approximately 0.125 inch in height. See figure 1 for a typical lock and double seam. 3.7.1.3 Ends. The container ends shall b
8、e fabricated from type I, grade 3, 75- to 90-pound base weight (pounds per base box) tinplate, having a tin coating of 1 .OS pounds per base box minimum average weight test value in accordance with QQ- T-425, 3.7.1.4 Lining compound. Lining compound used for end sealing shall be as recommended by th
9、e manufacturer. The lining compound shall not adversely affect or be affected by the desiccant. 3.7.1.5 Soldering. Soldering operations shall be made with tinlead solder, composition Sn40, Sn50, or Sn60 conforming to QQ-S-571. Corrosive or combustible flux may be used provided all traces of flux are
10、 removed from the outside of the cartridge and, insofar as possible, from the inside of the cartridhe. A maximum of 5 mg of solvent-extractable flux may be left inside the cartridge. Flux containing toxic materials or giving off toxic fumes at a temperature of 200 F or less shall not be used. 3.7. l
11、. 6 End retainers. Retainers shall be provided at the ends of the cartridge as shown on figure 1. The retainers shall be formed from iron or steel sheet of nominal 0.030-inch thickness and perforated with 0.094 inch holes on 3/16-inch centers. The retainers shall be a free-sliding fit-with a clearan
12、ce not to exceed 0.078-inch on diameter 2nd shall not be bound into the end seams when the container is sealed. 3.7.1.7 Welding. - The body shall be seamed the entire length by overlapping the body blank edges and applying continuous electrical resistance seam weld. 3.7.2 Filters. Three- glass-fiber
13、 filters shall be provided in each cartridge, one at each end and one in the middle as shown on figure 1. The filters shall withstand temperatures up to 6000 F without damage. They shall contain no bounding agent or impregnation that will burn or be absorbed by the desiccant. The filters shall be cu
14、t llot less than 0.750 inch oversize on diameter from glass-wool stock of sufficient density and thickness to support a uniform load of 1.500 psi without being compressed to a thickness of less than 0.313 inch. The filters shall be so installed that free passage of gases or desiccant particles will
15、not occur between the filter and the wall of the container, and so as to prevent desiccant dust.from leaving the cartridge. 3.7.3 Desiccant. 3.7.3.1 Type I. The desiccant shall be in accordance with MIL-D-3716, type I or 11, grade H-ar M. he desiccant shall be mechanically and chemically nontoxic an
16、d shall not: deliquesce in the presence of water or water vapor. A gas Or liquid shall not be produced or caused to be produced by the desiccant material in reaction to water or water vapor. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-4752E
17、 44 m 7777706 0207732 O m MIL-C-4952E (USAF) 3.7.3.2 Type II. The desiccant material shall meet the particle size, particle strength, and corrosiveness requirements as applicable to type II, grade H desiccant in accordance with MIL-D-3716. The desiccant particle size shall be between 8 and 16 mesh.
18、The desiccant shall be mechanically and chemically nontoxic and shall not deliquesce in the presence of water or water vapor. A gas or liquid shall not be produced or caused to be produced by the desiccant material in reaction to water or water vapor, 3.7.3.3 Desiccant quantity. The cartridge shall
19、be filled with sufficient desiccant to insure that: a. The desiccant will be held in compression by the fiber-glass filter pads after cartridge assembly. b. When the top cover is removed from a cartridge with its centeriine in the vertical plane, the end retansr wi.11 be so forced from the cartridge
20、 body by the filter pad resiliency that the upper edge of the retainer cup lip will extend not Less than 0.031 inch outside the cartridge bayond the unbroken end-to-body seam. 3.8 Part numbering of interchanpeable parts. All parts having the same manufacturers part number shall be functionally and d
21、imensionally interchangeable. The item identification and part number requirements of DoD-D-1000 shall govern the manufacturers part numbers and changes thereto, 3.9 Exterior finish. The exterior surface of the cartridge shall be finished with tinplate only. 3.10 Operational markings. 3.10.1 Handlin
22、g instructions. The instructions specified in table I shall be printed on the polyethylene bag specified in 3.12.3. The printing shall be legible and of a permanent nature. 3.10.1.1 Intended use marking. In addition to the instructions specified in table I, the following note shall be printed on the
23、 polyethylene bag: THE CARTRIDGE IS INTENDED FOR USE WITH THE DEHYDRATOR CYLINDER CONFORMING TO MIL-C-83960 TO DRY HIGH-PRESSURE AIR,OXYGEN, HY- DROGEN, HELIUM, OR NITROGEN GASES DURING GROUND SERVICING OF AIRCRAFT OR MISSILE GAS SYSTEMS. Provided by IHSNot for ResaleNo reproduction or networking pe
24、rmitted without license from IHS-,-,-MIL-C-4952E (USAF) TABLE I INSTRUCTIONS FOR REPLACING CARTRIDGES IN CARTRIDGE HOLDERS 1. Release pressure in cartridge holder. 2. Remove cartridge holder cap assembly and extract exhausted cartridge. 3. Inspect cartridge holder and cap assembly to insure gaskets
25、are in proper condition and position. 4. Cartridge holder interior should be free from dust, paint, or metal chips; grease, oil, water, or other contaminants. NOTE: When oil, grease, or any hydrocarbon is found in cartridge holders on BREATHING OXYGEN, or water-pumped nitrogen, hydrogen, helium, or
26、air servicing units, remove the complete cartridge holder from the unit, wash the holder (including cap assembly) in clean, pure cleaning solvent, then wash with hot water detergent or soap solution. Rinse in clean water, dry, and bake in an oven at 400 F for 1 hour. Install new packing and replace
27、holder on the servicing unit. Avoid even the slightest contamination-of the cartridge or cartridge holder with oil or grease, particularly when used on an oxygen servicing unit. 5. Open the end of the plastic bag and slip cartridge into holder. On oxygen servicing units, do not touch the cartridge d
28、uring insertion. - 6. Fit the cap assembly into place, press down, and start threads into engagement. The cutters will be forced into the top and bottom of the cartridge as the cap assembly is screwed into place. 7. Screw cap assembly down to a moderately tight fit using a handtool between the cap l
29、ugs. 8. Pressurlze SLOWLY and check for leaks. 3.11 Identification of product. The cartridge protective bag shall be marked in accordance with MIL-STD-130 as specified for parts. 3.11.1 Ending marking. The manufacturers mark and the year of manufacture shall be stamped on one end of the cartridge. 3
30、.12 Cleaning and degreasing. 3.12.1 Cleaning and degreasing prior to assembly. The cartridge shell, including the ends and retaining discs, shall be degreased before assembly. After the cartridge shell side seam and one end have been assembled and sealed, cleaning Shall be accomplished by one of the
31、 following methods: 3.12.1.1 Method A. A vapor degreasing method with.stabilized trichloroethane con- forming to MIL-T-81533 shall be used. The cartridge shall be blown clean and dry with a stream of clean, dry, oil-free air until all traces of the trichloroethane fluid have been removed. As an alte
32、rnate after degreasing, the cartridge shall .be dipped in a hot water (180“) bath and then wiped with a soft wiping cloth unti1dI traces of the trichloroethane are removed. a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4952E (USAF) 3.12.1.2
33、 Method B. The cartridge shall be flushed with naphtha conforming to TT-N- 95 and blown clean and dry of all solvent with oil-free air. It shall then be flushed with anti-icing fluid conforming to TT-1-735 or anhydrous ethyl alcohol and rinsed thoroughly with fresh, clean water. Following this, the
34、cartridge shall be thoroughly dried with a stream of clean, dry, oil-free air. 3.12.1.3. Method C. The cartridge shall be flushed with a hot, inhibited, alkaline cleaner until all traces of foreign matter have been removed and thoroughly rinsed with clean water. It shall then be thoroughly dried wit
35、h a stream of clean, dry, oil-free air. 3.12.2 Final deqreasing. After final assembly and testing, all cartridges shall be degreased, defluxed, and thoroughly dried before being packaged in the polyethylene bag specified in 3.12.3. Final degre-asing shall be accomplished in ac- cordance with method
36、A, B, or C as specified in 3.12.1.1, 3.12, 1.2, and 3.12.1.3. After final degreasing, the cartridge shall be handled in such a manner as to preclude contamination. / 3.12.3 Protective bag. After final cleaning and inspection, each cartridge shall be sealed within a polyethylene bag conforming to L-P
37、-378, type I, grade B, finish 2, having a minimum thickness of 5 mils. The bag shall be of sufficient size to permit the cartridge to be slipped from the bag and into the holder without touching the cartridge with the bare hands. 3.13 - Workmanshu. The cartridge shall be fabricated and finished in a
38、 thoroughly workmanlike manner. Particular attention shall be given to freedom from blemishes, defects, burrs, and sharp edges; accuracy of dimensions; thoroughness of soldering; et cetera. Loose, spattered, or excess solder; metal chips; solder flux; and all other foreign material shall be removed
39、prior to final degreasing. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as Specified herein. Except as otherwise specified, the supplier
40、may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that supplies and service conform to the prescribed requi
41、rements. 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this Specification shall become a part of the contractors overall inspection system or quality program. The absence OP any inspection requirements in the specification
42、shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirement of the contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actu
43、al, nor does it commit the Government to acceptance of defective material. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-4752E 44 m 4777706 0207735.b m MIL-C-4952E (USAF) 4.2 Classification of tests. The inspection and testing of the cartr
44、idge shall be classified as follows: a. Qualification testing . See 4.4 b. Acceptance tests See 4,5 4.3 Test conditions. I 4.3.1 Instrumentation 4.3.1.1 Pressure measurements. Pressures shall be recorded in pounds per square inch gage. Pressure differentials shall be recorded in inches of water or i
45、nches of mercury, as applicable. 4.3.1.2 Temperature measurements. Temperatures shall be measured by appropriately located thermometers or thermocouples used with calibrated potentiometers. Temperatures shall be recorded in degrees Fahrenheit. 4.3.1.3 Flow measurements. Gas flow measurements shall b
46、e obtained by passing the material through a properly Calibrated meter designed to handle the gas being measured. Gas flow rates shall be recorded as standard cubic feet per minute (scfm). I Total quantities of gas passed shall be recorded as standard cubic feet (scf). 4.3.2 Preparation for test. Th
47、e cartridge shall be prepared for testing as required by the specific test instructions. - 4.3.3 Observations. During the progress of all tests, the performance of the cartridge shall be observed to determine the degree of compliance with all requirements Specified herein. 4.3.4 Test data. Test data
48、 shall be recorded as required under the specific tests. 4.3.4.1 Correction of data. If the tests Specified herein cannot be conducted under the specified conditions, the tests may, upon approval by the procuring Conditions and the performance under the specified conditions calculated from the test
49、results obtained. The manner of calculation shall be demonstrated, and actual data proving the correctioness of the calculation methods shall be presented along with the report for review by the procur-ng activity. I activity for each deviation from the specified conditions, be conducted under other 4.3.4.2 Tolerances. The tolerances shall be as follows: a. Pressure gages shall be accurate to within 2 percent of the numerical figure recorded
