1、MIL-I-81508(AS) 5 December 1966 MILITARY SPECIFICATION INDICATOR PLUG, FOR MISSILE PROPELLANTS This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope - This specification establishes the requirements for an indicator plug to detect by color
2、change, leaks of certain propellants, principally mixed amine fuels and fuming nitric acid. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATI
3、ONS Federal QQ-A-00225/8 Aluminum Alloy Bar, Rod, Wire, and Special Shapes, Rolled, Drawn, or Cold Finished, 6061 UU-P-63 Paper , Blotting PPP-B-566 Boxes, Folding, Paperboard PPP-B-676 Box, Set-.up Military MIE B-117 Bags and Sleeves, Interior Packaging MIL-S-6855 Synthetic Rubber , Sheets , Strips
4、 , Molded or Extruded MIL-S-7742 Screw Threads, Standard, Optimum Selected Series, General Specification for Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-35O 66 M 77777Ob 0343375 b = MIL-I-81508( AS) STANDARDS Federal FED-STD-595 Colors Mili
5、tary MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 Marking for Shipment and Storage MIL- STD- 794 Parts and Equipment, Procedures for Packaging and Packing of MS3 3 5 86 Metals, Definition of Dissimilar (When requesting any of the applicable documents, refer to
6、both title and number. Copies of the specifications and applicable documents may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code 1061, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. ) 2.2 Other publications - The following document forms a part of this specific
7、ation to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. Handbook H28 - Screw-Thread Standards for Federal Services I (Application for copies should be addressed to the Superintendent of Documents, Gover
8、nment Printing Office, Washington, D. C. 20402. ) 3. REQUIREMENTS 3.1 Materials - Materiais used in the manufacture of the indicator plug shall conform to the applicable Government specifications or where Govern- ment specifications are not involved shall be of high quality and suitable for the inte
9、nded purpose. 3.1.1 Metal - Metal component parts of the indicator plug shall be mkufactured from an aluminum alloy conforming to QQ-A-00225/8. Unless suitably protected against electrolytic corrosion, dissimilar metais shall not be used in intimate contact. Dissimilar metals are defined in MS33586.
10、 3.1.2 Gasket material - Unless otherwise specified, rubber gasket components shall be fabricated from synthetic material conforming to MILS- 6855, Cl. I- II, Grade 60. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-81508 66 7797906 O1Ll337b B
11、 3.1.3 Spacer-separating washers - The spacer-separating washer materid shall be polytetrdtuoroethylene. 3.1.4 Plastic - Material used in the manufacture of the color code disk shall be a weather resistant plastic. The color shall be yellow, matching approximately Color Chip No. 23793 of FED-STD-595
12、. 3.1.5 Transparent viewer- The viewer shall be a transparent plastic such as plexiglass UF-3, capable of absorbing or reflecting ultra-violet light. 3.1.6 Propellant leak indicator element - Material used in the manu- facture of the indicating element shall be blotting paper conforming to W-P-63, G
13、rade 8, color white, halftone, and smooth on both sides. The thickness shall be O. 0185 110.0035 inch. The element shall consist of two semicircles of blotting paper. One semicircle shall be treated with enough N-phenylanthranilic acid to turn bright yellow when exposed to fuming nitric acid. The ot
14、her semicircle shall be treated with enough mercurous cliloride to turn black when exposed to the mixed amine fuel fumes. A thin green line shall be drawn across the center of the element to denote the treated side. The indicating paper containing N-phenylanthranilic acid shall be prepared by adding
15、 several drops of a mixture of O. 4 percent or more by weight of N-phenylanthranilic and O. 4 percent of water dispersible titanium dioxide (Titanox RAF-1 or equal) in methyl alcohol. The indicating paper containing mercurous chloride shall be prepared by adding several drops of a mixhire con- taini
16、ng 15 percent or more by weight of mercurous chloride and 1 percent by weight of carboxymethylcellulose in water. 3.2 Design - The propellant leak indicator shall be soesigned that the indicating element is freely exposed to a confined atmosphere such as in a drum container, missfle container, or be
17、hind a bulkhead door. The design shaU be such that only common hand tools are required to install and remove the plug from the container wall. Udess otherwise specified, dimensions shall be in coiiformance with Figures 1 and 2. 3.3 Construction and assembly - The leak indicator plug shall be so cons
18、tructed th& it will withstand the strains, shocks, aiid vibrations, due to shipping, storage, and service usage. Both the construction and assembly of the leak indicator plug shall be in accordance with Figures 1 and 2. 3.3.1 Screw threads - Unless otherwise specified, screw threads shall be 1-1/2 N
19、PS 11-1/2 (straight pipe thread) and shall conform to Handbook H28. 3.4 Identification and markings, - (See 6.2.) 3.4.1 Color code disk - The color code disk shall be marked for identification with lettering 1/8 inch high printed directly on the disk or on 3 4 cs Provided by IHSNot for ResaleNo repr
20、oduction or networking permitted without license from IHS-,-,-MIL-I-150 bb W 777770b 01113377 T M COLOR CODE DISK CONTAINER PARCO 568-126 “O“ RING RUBB LOCKSCREW PLUG SPACER - SEPARATIN WASSER (POLYTETRA FLUORETHYLENE) INDICATOR ELEMENT MARMNO GUIDE SIDE Il/yy FLAT (RUBBER) GASKETB SECTION A- A 1.62
21、5 - 12N - W MIL&7742 I I # 1.000 DIA LGROOE FOR 1“ ALLEN WRENCK DEPT ,376 LOCK8CREW PLUG DIMENSIONS IN INCHES ASSEMBLY 1-1/2 - NFS 11-1/2 rB 1 1.540 DA 1 DEEP INSIDE THREADS 1.375 DU 1.550 FLATTEN 1/16 i INTERNAL LENGTH DIMENSIONS BIIALL BE SUCH A8 TO ACCOMMODATE COMPONENT HARDWARE i. 8 LOCKBCREW, V
22、IEWER, INDICATOR ETC. 1 1 DIA X .o62 DEEP SECTION B-B #/A 1.000 “,.- 1.625 - 12N - 2B MIL-S-7742 Figure 1 VIEWER AND u)cKBCREW CONTAINER 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-81508 66 7777706 0143378 1 MIL-1-81508 (AS) BLACK LETTERI
23、NG 2.370 DIA - TO FIT OVER FUT GASKETS (RUBBER) Bright Yellow Like This Collar GUIDE BLACK LETTERING Black-MAF Leak White-Ok YELLOW CONFORMING APPROX TO FED. STD. 595 COMIR NO. 23793 COUIR CODE DISK i-l/Z - NPS 11-1/2 1 1.877 : DIA / 1 t- f 5: 1 t-“O l.SfSDIAJ TRANSPARENT VIEWER DIMENSIONS IN INCHES
24、 Figure 2 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-B35OB bb W 7779706 0343377 3 i MIL: 1-81508 (AS) labels which shall be waterproof and weatherproof. Lettering shall not be obliterated by normal handling or immersion in water and shal
25、l not fade under exposure to direct sunlight. 3.5 Color and sensitivity of the indicating element - When the indicator plug is subjected to the test of 4.5.1, the color of one semicircle of indicating paper shall be bright yellow, and the color of the other semicircle of the indicating paper shall b
26、e black. 3.6 Simdated sunlight exposure test - When the plug is exposed to the simulated sunlight exposure of 4.5.2, there shall be no evidence of dis- coloration of the indicating element in the plug. 3.7 Workmanship - The complete indicator plug shall show no mold marks, cracks, splits, nor other
27、surface or visible defects which may impair the physical properties and performance characteristics of the indica- tors in any way. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the pe
28、rformance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the in- spections set forth in the specification whe
29、re such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Sampling for inspection - Sampling for inspection shall be performed in accordance with the provisions set forth in MIL-STD-105 except where otherwise indicated. For purposes of sampling,
30、 an inspection lot shall consist of ail material made by the same process, from the same manufacturer, and to be delivered at one time. 4.2.1 Inspection of components and materials - In accordance with 4.1 above, the supplier is responsible for insuring that materiais and components used were manufa
31、ctured, tested, and inspected in accordance with the requirements of referenced subsidiary specifications and standards to the extent specified, or, if none, in accordance with this specification. In the event of conflict, this specification shall govern. 4.2.2 Examination of the end item - The end
32、item shall be examined in accordance, with the classification of defects, inspection levels, and acceptable quality levels (AQLS) set forth below. The lot size, for purposes of determining the sample size in accordance with MIL-STD-105, shall be expressed in units of indicators for examinations unde
33、r 4.2.2.1 and 4.2.2.2, and in units of shipping containers for examination under 4.2.2.3. 4.2.2.1 Examination of the end item for defects in appearance, con- struction, identification and workmanship - The sample Unit for this examination shaU be 1 indicator plug. Provided by IHSNot for ResaleNo rep
34、roduction or networking permitted without license from IHS-,-,-EXAMINE Mate ri al MIL-1-81508 bb 77777Ob 0143380 T Construction Ide nt ific at io n Workmanship MIL-1-81508 (AS) DEFECTS Dissimilar metals in intimate contact Gasket or sealing material adjacent to indicating element Metals not conformi
35、ng to QQ-A-00225/8 Indicating element blotting paper material not conforming to UU-P-63, Grade B Rubber material not conforming to MIL-S-6855, Class II, Grade 60 Color code disk material not conforming to 3.1.4 Separating washer material not conforming to 3.1.3 Viewer not transparent Indicating elem
36、ent is not freely exposed to the interior surface of container Special tools required to assemble and disassemble Exterior gaskets do not seat properly in plug groove Blotting paper not white in color, halftone and smooth on both sides Indicating element not placed in plug treated side up Illegible
37、Incorrect Incomplete Mold marks Cracks Tears Splits Surface defects Burrs 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-81508 (AS) 4.2.2.2 Examination of the end item for defects of dimension - The sample unit for this examination shall be
38、one indicator. Blotting paper EXAMINE Color code disk Plastic viewer Screw thread DEFECTS Blotting paper thickness varies more than tolerance specified in 3.1.6 Disk thickness varies more than tolerance specified in 3.1.4 Viewing area not as specified in 3.1.5 Thread size not 1-1/2 NPS 11-1/2 Color
39、code disk markings Lettering not 1/8 inch high 4.2.2.3 Examination of preparation for delivery - Examination shall be made to determine compliance with packaging and packing and marking require- ments of this specification. The sample unit shall be one shipping container fully packed and selected ju
40、st prior to the closing operation, EXAMINE DEFECTS Material Packaging: Heat sealable bag does nc conform to MIL-B-117, Class E Packing: Indicator not snugly packed Set-up box Incomplete or insecure sealing of container flaps Workmanship n Quantity differs from that specified in contract or purchase
41、order Packing: Insecure, loose strapping or tap e banding Bulging or distortion of shipping container Broken, bruised, crushed or otherwise damaged shipping container which may result in injury to or loss of contents 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
42、nse from IHS-,-,-MIL-1-81508 bb W 77777Ob 0243382 3 EXAMINATION PARAGRAPH INSPECTION LEVEL. 4.2.2.1 I 4.2.2.2 I 4.2.2.3 5-4 EXAMINE Workmanship (Continued) AQL 2.5 2.5 6.5 Weight DEFECTS l- Markings (unit package and shipping containers) : Omitted, incomplete, incorrect, illegible Of improper size,
43、location, sequence or method of application Gross weight in excess of weight limitations of container specific ation 4.4.1 Samples for quality conformance test - A sample unit con- sisting of two indicator plugs shall be randomly selected from each inspection lot in accordance with MIL-STD-105, Insp
44、ection Level S-2 and acceptance number zero. The sample unit as referenced herein is defined as the number of indicator plugs required to perform the test. 4.5 Test methods - 4.5.1 Color and sensitivity of the indicating element - 4.5.1.1 Apparatus - The apparatus shall consist of two desiccators ea
45、ch containing silica gel as the desiccant. Five cuhic centimeters of fuming nitric acid shall be poured in a small glass container contained in one desiccator. In the other desiccator, five cubic centimeters of mixed amine fuel shall be poured into a small glass container. 9 Provided by IHSNot for R
46、esaleNo reproduction or networking permitted without license from IHS-,-,- MIL-1-81508 hb 797790b 01iY3383 5 MIL-1-81508 (AS) 4.5.1.2 Procedure - An indicator plug containing the indicating element shall be placed in each desiccator. The color of the indicating paper shall be checked within fifteen
47、minutes for color change. The color of one semicircle of indicating paper shall be bright yellow. The color of the other semicircle of indicating paper shall be black, 4.5.2 Simulated sunlight exposure - 4.5.2.1 Test procedure - Place the indicator plug under a R. S. Sunlamp for 500 hours. The lamp
48、shall be positioned 15 inches fro& the base of a 16-inch diameter turntable which shall revolve at 3 RPM. The temperature on the turntable shall be maintained at 120 -+2 F. A power pac shall be installed in the line to maintain a constant line voltage to the lamp. Before exposing the indicator plug
49、under the sunlamp, the lamp shall have burned for a minimum of 100 hours. The lamp must also be in operation at least 3 hours immediately before plug exposure. After exposure, the plug shall be examined for conformance with the requirement. (See 3.6.) 4.5.3 Rejection criteria - Failure of the indicator plug to conform to the above tests shall reject the lot represented. 5.
