1、FIIE-V-26UF;A (U SAF) 12 July 1957 - Superseding 16 January 19% MSO.V-26L15j (USAF) MILITARY SPECIFICAT ION VACUUM SYSlEM, LEAK DETECTOR, AUXILIARY AF/E3-1 1. SCOPE; 1.1 This specification Covors the requirements for one type of auxiliary leak detector vacuum system, designated AP/E34T-1. 2, APFSICA
2、BLE WaIMENTS 2.1 The following documents, of the issue in effect on date SPEGCFICBT IONS of invitation for bids, form a part of this specification: .” Federal QQ-P-4l.6 Plating, Cacmj.um (Electrodeposited) LLGB-631 UL-B-636 PPP-ES8s Boxes, Wood, Wirebound PPP-B-601 Boxes, Wood, Cleated-Plywood PPP-B
3、-621 Boxas; Fiber Corrugated (For Domestic Shipment) Boxes, Fibor, Solid, (For Domestic Shipment) Boxes, Wood, Nailed and Lock-Corner MIGP-116 MIL-P-138 Packaging and Packing For Overseas Shipment, Genera Specification Preservation, Plothods Of Boxes, Wood, Fiberboard-Lined For Overseas shipmnt (For
4、 Weight Contents Hot Exceeding 500 Pounds) btector, Leak, Mass Spectmnieter, Type MA4 Drawings and Khta Lists; Preparation Of 14anuf acturers 1 (For Production Aeronautical and Associated Equipment) Box, Wood, Cleated, Veneer, Paper Ooerlaid Liners, Case, Waterproof Colors Marking For Shipment and S
5、torage Identification Narking of U S. #ilitary Property Metalie, Definition of Dissimilm , FSC 4920 Licensed by Information Handling ServicesLicensed by Information Handling Services7 flIL-V-26115A 47 7777706 0477405 4 pm MLL-V-2611% (USAF) 3.4.2 PRDTECIIVE TREA2iGNT.- When materials are used In the
6、 construction of the system that are subject to deterioration when exposed to climatic and environmental conditions likely to occur during service usage, they shall be protected against such deterior- ation in a manner that will in no w+y prevent compliance with the perfornance requirements of this
7、specification. protective coating that will crack, chip, or scale with age or extremes of climatic and environmental conditions shU h4 avoided. The use of any 3.5 DESIGN PNiD CNSFUJCIION 3.5.1 The system shall be designed as a combination vacuum system and test bench which will facilitate simplified
8、 and rapid leak testing of hermetically sealed instruments and their associated equipment. The test bench shall house the vacuum pump, manifold, the controls and indicators. The manifold shall connect the vacuum pump to two pump plates on top of the test bench as hereinafter specified to facilitate
9、evacuating bell jars on the pump plates. 3.5.1.1 The.vacuum system shall be so constructed as to pro- vide an outlet connection fron the manifold suitablefor attaching directly to the intake line of the mass spectrometer type leak detector constructed in accordance with MIL-D-48J.S. and repairs can
10、be easily made by personnel of hstrument overhaul 3.5.2 The system shall be constructed so that ajustments depots. 3.6 PWOiWNCZ.- The system shall be capable of meeting the tests specified in section 4 when subjected to the following conditions: a. Pump down.- The system shall evacute the size No. 1
11、 bell jar from atmospheric pressure to 1000 microns Hg in not more than 1.5 minutes, b. Life.- Continuous operation for a period of 240 hours without mczlfiinction. 3.7 INli;EICHANGUL!LPCY.- All parts having the same manufac- turoers part number shall be functionally and dimensionally inter- changea
12、ble-. . govern changes in the manufacturerts part numbers. The drawing number requirements of i% . -. . . z. 5 i- , Licensed by Information Handling ServicesBELL JARS Licensed by Information Handling Services.- I- A -3 I . -1 NSTRW M ENT EXNAVST fV6 I VACUUM PLATE I 4 DIMENSIONS IN INCHESs. .UNLESS
13、OTHERWISE SPEGIFJEO, TOLERANCES: FRACTIONS A (USAF) 4.2.2 SAMPLING TESTS 4.2.2.1 SAMPLING PLAN.- One system selected at random from each ten or less produced on the contract or order shall be subjected to the folloking tests as described under 4.4 TEST METHODS: - a. Individual tests b. Continuous op
14、eration hb2*2b? REJECTION AND FWEST.- Nhen one item selected from a production run fails to meet the specification, no items sti on hand or later produced shall be accepted until the extent and cause of failure are determined. . 4.2.2.2.1 INIIIVLDUAL TESTS MAY C0hTINUE.- For operational reasons, ind
15、ividual tests may be continued pending the investigation of a sampling test failure. or later produced shall not be made until it is determined that items meet all the requirements of the specification. Eut final acceptance of items on hand 4.2.2.2.2 DEFECTS IN ITENS AU,RUDY ACCEP1ED.- The investiga
16、tion of a test failure could indicate that defects may exist in items already accepted, procuring activity of alz defects likely to be found and methods of , . correcting them. If soo the contractor shall fully advise the 4.3 TET CONDIlIONS 4.3.1 STANDJRD ATE0SPHE;RJ.C CONUTi1ONS.- %enever the press
17、ure and temperature existing at the time of the test are not specified definitely, it is understood that the test is to be made at atinosphefic pressure (approxhately 29.92 inches Hg) and at room temperature (approxiniately +25“C). When tests are made with atmospheric pressure or room temperature if
18、fering materially from the above vaues, proper allowance shall be made for the difference from the specified condition . . 4.4 TES1 METHDS 4.4, E;XAhINATION OP PRDC2.- Each vacuum system shall be inspected to determine compliance with the requirements specified herein with respect to materials, work
19、manship, and marking. . 4.4.2 PUMP Doh!.- Each system shall be tested for proper operation with each size of bell ja* furnished with the system. The system shall be prepared for operation by using the size1 bell jar on top of a vacuum plate. The time required to pump down the size 1 bell jar from at
20、mospheric pressure to 1000 microns Hg shall not exceed 1,s minutes. The large size bell jars shall be evacuated In a similar manner. . There. shall be no apparent-evidence of leakage during any of these tests. 9 . Licensed by Information Handling ServicesLicensed by Information Handling ServicesMIbV
21、-26115A (USAF ) 5.2.2 LEXEL B.- Vacuum system preserved and packaged to meet 5.1.2 shall be packed in domestic type exterior containers meeting PPP-B-O , PPP-B-585, PPP-B-621, or .ML-B-10377, shall be of minimum cube and tare consistent with the protection required, As far as practical, exterior con
22、tainers shall be of uniform shape and sise and contain identical quantities. The gross weight of each pack shall be limited to approximately 500 pounds. Contkiners shall be closed and strapped in accordance with.the applicable container specification or appendix thereto. When fiber- board containers
23、 are used, the fiberboard ahall meet the special Exterior containers requirements table of UEB-631, or UirB-636, as applicable. 5.2.3 LEVEL C.- Packages which require over-packing for accept- ance by the carrier shall ba packed in exterior type shipping con- tainers in a manner that will insure safe
24、 transportation at the lowest rate to the point of delivemy. solidated Freight Classification Rules or Regulations of other comon cariers as applicable to the mode of Transporbatin. Containers shall meet Con- 5.3 PHIIS1CA.L PRDl!ECIION.- Cushioning, blocking, bracing and . bolting as required shall
25、be5n accordance with JAN-P-100 except that for domestic shipments, waterproofing requirements for cushioning materials and containers shall bs Waived. shall be waived when preservation, packaging, and packing of the item is for immediate use or when drop tests of ME-Y-ll6 are ap.icable. Drop tests o
26、f JAN-P-l 5.4 URKING OF SKT,P“S.- Interior packages and derior shipping containers shall be marked in accordance.with MIL-SJ?D-129. The nomenclature shall be as follows: Vacuum System, Leak Detector, Auxiliary kF/E; and the fact that the Govern- . ment may have formulated, furnished, or in any way s
27、upplied the said drawings, specifications, or other data is not ta be regarded by implication or otherwise as in aw manner licensing the holder or an;y other perbon or corporation, or conveying any rights or permission to manufacture, use, or seli any patented invention that may in any way be mlated thereto. 12 Licensed by Information Handling Services
