1、MIL-P-6131 C MIL-P-6131 B 15 July 1969 MI LI TA RY S P ECI F I CATION PLUGS, DEHYDRATOR, INDICATING HUMIDITY This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes requirements for humidity indicating, d
2、ehydrator plugs that are intended to protect aircraft engine cylinders and other similar equipment against corrosion due to moisture and to indicate through color change unsafe levels of humidity (see 6.1). 1.2 Classification. Dehydrator plugs shall be of the following types, as specified (see 6.2).
3、 Type I - Reusable. Type II - Reusable and refillable. . 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specification and standards. Unless otherwise specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specification a
4、nd Standards (DoDISS1 specified in the solicitation form a part of this specification to the extent specified herein. SPEC1 FICATIONS Federal PPP-B-60 1 Boxes, Wood, Cleated-Plywood PPP-B-621 Boxes, Wood, Nailed and Lock Corner Beneficial comments (recommendations, additions, deletions) and any pert
5、inent data which may be of use in improving this document should be addressed to: 931, Naval Air Engineering Center, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appe.aring at the end of this document or by letter. Engineering Specific
6、ations and Standards Department (Code / FSC 6685 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.* c. MI L-P-613 1 C - *$ ., SPECIFICATIONS (Continu.ed) . Federal (Conti nued) PPP-B-636 . P$P-C-96 v.- Mi 1 i ta2 - Mi L.-D-.3716 MIL-D-6054 STANDARDS
7、Fe :l?rai, FED. TEST METHOD STD, NO. 101 .- -._ Vilttag. I M 1 1 .-STO- I O 5 MIL-STD-129 MS3396 MS .*, 398 MS272 15 , I . : Box, Shippng, Fi,berboard, Cans, Metal; 28 Gage ahd Lighter . - Desiccants, Activated: For Dynamic Dehurni di f i cat i on Drum, Me tal:. Shi ppi ni and S torge Rubber, Synthe
8、tic, .Sheets, Strips, -Molded or *. Extruded Shapes 1. / LZ =1 Test Procedures for Packag4 ng Mdter als 5 Sampl tng Procedures and Tables for .Inspection by Attrlbutes Marklng-for Shipment and Storage Iden t i fi cat i on Marki ng . of U. S. Mi 1 1 tary Property Plug, Dehydrator, Humid1 ty Indkating
9、, Englne Cy1 i nder-d) Card-Humid1 ty-Indlcatlng Color tomparison Plug, Dehydrator, Humidity Indi:cating, -Engine Cy1 Inder (18mm Thread) e- (Copies of specifications, standards, handbooks, drawings add pub1 ications required by manufacturers In connection wlth specific acquisitlon functlons should
10、be obtained from the contracting activl ty or as directed by the contract i ng off i Cer. ) thls specification. and references cl ted herein, the text of th$ specification shall takwprecedence. 2.1.2 Order of precedence. In the event ofifnflict between the text in 2 only As received After aging shal
11、l occur. neg 1 i g i bl e “dus ti ng “ of des i ccan t Vi si bi 1 i ty of desiccant Quantity of desiccant in opaque portion of plug shall not exceed 80% of minim charge specified .in table II. . Seal effectiveness . Moi sture absorbed: maximum based on minimum charge specified In table II. 1 .5 mg/g
12、 , Moisture content of 6% by weight, maximum. desiccant: as received 1 I Mat er vapor absor p t i on of desiccant Shall be capable of absorbing 0.28 g of watervapor per 48 hrs per sq. cm. of plug cross section, Watervapor transmission Weight of desiccant in plug shall not change more than 1.5 mg per
13、 gram, based on minimum charge specified in table II. of plug Thermal stabi 1 i ty and react i vat ion (plugs ) (a) Shall show no deformation or loss of physical properties. (b) Shall conform to watervapor transmission requirement (4,6.7). (cl Moisture content of desiccant . after. watervapor transm
14、i ssion test shall not exceed 6% by weight (4.6.5) 6 Test paragrap T 4.6.1 4.6.2 4.6.2 4.6.3 4.6.4 4.6.5 4,6.6 4.6.7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE III. Performance requirements. (Continued) Complete the procedure in 30 secs. I
15、 Disassembly, refi 11 - (4) Mo wo Where MP = weight of moisture content of test desiccant prior to test = W, Mo wo W, = weight of test desiccent after exposure in humidity cabinet. WP = weight of test desiccant after moisture content test. Mo = average weight of moisture content “as received plugs.
16、Wo = average weight of desiccant aftermoisture content test for “as received“ pi ugs. All units are in grams. The above value is then divided by the area of the plug based on the nominal thread diameter to obtain the watervapor absorption value. shall meet the applicable requirement of table III. Th
17、e plugs 4.6.6.2.2 Type II pluq. The contained desiccant of three type II plugs After exposure, the shall be removed and weighed to the nearest milligram, the desiccant replaced, the seal removed, and the plugs exposed in a humidity cabinet under the same conditions and period of time as for the type
18、 I plugs. contained desiccant of each plug shall again be removed and weighed. The watervapor pick-up shall be determined for each plug and shall meet the applicable requirement of table III. 4.6.7 Watervapor transmission of plug. 4.6.7.1 Apparatus. The apparatus shall include six stoppered weighing
19、 bottles, a scale capable of weighing to the nearest milligram, six aluminum-alloy bosses of the type described in 4.6.1.1, a humidity cabinet, described in ASTM D 1748 and an oven, 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.6.7.2 Procedure
20、. The seal shall be taken off six plugs, the desiccant removed, and an amount of desiccant equal to at least 75 percent of the amount specified as a minimum charge on the applicable MS drawing placed in separate weighing bottles, stoppered and weighed to the nearest mi 11 igram. Removal of the desic
21、cant from the plugs may be accomplished as %follows: (a) Disconnect the glass part from the body of the plug where means are provided for this operation, or (b) Remove or puncture the retainer in the moisture entrance end of the plug. All of the desiccant, previously removed, to the plug from which
22、it was removed, and the plug immediately screwed into a boss. The plug shall be screwed into the- boss to the seating torque specified in the appl icable MS drawing. Three assembl ies shall be exposed in a humidity cabinet to an atomsphere of 120 +2“F and a relative humidity of 92.5 52.5 percent for
23、 a period of 72 hours: The other three assemblies shall be exposed in an oven maintained at a temperature of 120 +Z0F for a period of 72 hours. At the end of the exposure periods in the humidity cabinet and oven, the plugs shall be detached from the boss, the desiccant removed and the desiccant from
24、 each plug reweighed to the nearest milligram in a stoppered weighing bottle. For the plugs exposed in the oven, the average change in weight from the three plugs shall be calculated. The three results of the watervapor transmission test shall be calculated as follows: sha-11 then be rapidly transfe
25、rred Gain (mg/g = humidity cabinet change in mg - average oven pickup in mg minimum charge in grams specified in table II The watervapor transmission for each plug shall meet the applicable requirement in Table III, 4.6.8 Thermal stability and reactivation. 4.6.8.1 Apparatus. The apparatus shall inc
26、lude a humidity cabinet, described in ASTM D 1748, an oven with two narrow supports and a desiccator. 4.6.8.2 Procedure. A plug with the seal removed shall be placed in a humidity cabinet at a dry bulb temperature of 120 +2OF and relative humidity of 92.5 52.5 percent for 120 hours. At the end of-th
27、is time, the plug .shall be placed in an oven at a temperature of 265 to 275F in a horizontal position, supported freely on two narrow supports, each support to be Tocated within 114 inch of the end of the plug. After 24 hours of such conditioning, the plug shall be removed from the oven and placed
28、in adesiccator and allowed to cool for one hour. The plug shall be examined carefully to determine whether it has been deformed in any way physically by the temperature of the oven. The plug shall then be tested to determine conformance with the requirements for watervapor transmission (see table II
29、I and 4.6.7). Following this test, the plug shall be opened, and the moisture content of the contained desiccant determined. table III. The plug shall meet the applicable requirement in 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-F MIL-P-bL31C
30、 bb 9999906 0951588 7 MI L-P-6 13 1 C 4.6.9 Pressure (leakage) I 4.6.9.1 Apparatus. screwing into the threaded section, a source of air pressure (gage) and either a container of water or gages suitable for detecting a loss in pressure. A boss capable of gripping the base of the plug by 4.6.9.2 Proce
31、dure. The plug shall be fitted into a boss by screwing into the threaded section. For the 18 mm cyclinder plugs, 10 psig shall be applied to the filter end of the plug. the filter end of the plug. The assembly shall be examined for leakage in accordance with Method 5009 of FED.TEST METHOD STD. NO. 1
32、01. (See table III.) For 14 mm plugs, 2 psig shall be applied to 4.6.10 Corrosion. 4.6.10.1 Procedure. A plug shall be exposed to an atmosphere of 120 +2OF and 100 percent relative humidity in a humiditycabinet described in ASTM D 1748 for a period of 150 hours. At the completion of the exposure per
33、iod, the plug shall be examined for corrosion. Neither corrosion of the plug seal (provided the corrosion does not interfer with the removal of the seal from the plug) nor discoloration of the metal components of the plug (provided there is no pitting) shall be causes for corrosion failure, (See tab
34、le III,) 4.6.11 Flammability of desiccant retainer. 4.6.11.1 Procedure. The desiccant retainer or its components from a plug shall be exposed to the flame of a bunsen burner for 5 seconds. shall then be removed, and the retainer or its components examined to determine compliance with the applicable
35、requirement of table III. charring shall not be considered cause for rejection. The flame Light 4.6.12 Disassembly, refill and assembly. A filled type II plug shall be disassembled, disiccant reDlaced and reassembled either manually or with standard toois in the timestated in table III. - 5. PACKAGI
36、NG 5.1 Preservation, Preservation shall be level A or industrial, as 5.1.1 Level A. The plugs shall be snugly packed, cushioned with specified (see 6.2). chemically inert dunnage, if necessary, in 1-gal lon, mu1 tiple-friction closure cans conforming to type V, class 2 of PPP-C-96. one comparison ca
37、rd conforming to MS3398. activity, containers conforming to MIL-D-6054 may be used as an alternative container. specified by the acquisition activity (see 4.4.2 and 6.21, In each can shall be placed When specified by the acquisition The quantity of plugs preserved in each container shall be as 5.1.2
38、 Industrial. Plugs shall be preserved in accordance with ASTM D 3951. 5.2 Packing. The levels of packing shall be Level A, 6 or Industrial as 14 specified (see 6.2). P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 1 MIL-P-bL3LC bb -I 7q97qOb 055J5
39、7 7 _ - MIL-P-6131C i Ip : 5.2.1 Level A. Unless otherwise specified by the acquisition activity, 1 plugs, preserved in accordance with 5.1, shall be packed in containers conforming to overseas type PPP-B-601 or overseas type PPP-B-621 (gross weight not to exceed 150 pounds). 5.2.2 Level B. Plugs, p
40、reserved in accordance with 5.1, shall be packed i n containers conforming to domesti c types PPP-B-601 or PPP-B-621 (gross weight not to exceed 150 pounds) or overseas type PPP-6-636 class (gross weight not to exceed 70 pounds). 5.2.3 Industrial. Plugs, preserved in accordance with 5.1, shall be pa
41、cked in accordance with ASTM D 3951 5.3 Marking. 5.3.1 Interior and shipping containers .shall be marked as specified in MIL-STD-129. 5.3.2 Precautionary marking. Al 1 PPP-C-96 containers shall be marked with the fol lowing precautionary marking: CAUTION: REPLACE COVER AFTER EACH PARTIAL REMOVAL OF
42、CONTENTS. 6. NOTES 6.1 Intended use. The reusable plugs covered by this specification are intended for use in the preservation of reciprocating aircraft engines and related equipment. facilities to reactivate the contained desiccant are available. reactivate the contained desiccant are not available
43、, or where it would be more convenient to refi 11 the deactivated plug with fresh activated desiccant. The type II plug may be reactivated, if desired. 6.1.3 Moisture content. Plugs are satisfactory for use when the total moisture content of the contained desiccant does not exceed 7.5 percent at the
44、 time the plug is placed in use. 6.2 Ordering data. Acquisition documents should specify the following: 6.1.1 Type I. The type I plug is intended for use at field stations where 6.1.2 Type II. The type II plug is intended for use were facilities to (a Title, number, and date of this specification. (
45、b) Type, size, and MS part number required. (See 1.2 and table I.) . (c) Quantity to be packaged in container. (See 5.1.1.) (d) Level of preservation and packing required. (See 5.1 and 5.2.) (e) State if MIL-D-6054 containers are to be used: (See 5.1.1.) 15 Provided by IHSNot for ResaleNo reproducti
46、on or networking permitted without license from IHS-,-,-P- MIL-P-bL3LC bb W 777770b 0453590 5 MI L-P-6 1 3 1C 7 6.3 Changes form previCrus issue. Asterisks are not used 1.n this revision to identify changes with respect to the previdus issue We %o the extensiveness of the changes. Custodians: Army - AV Navy - AS Air Force - 99 Revi ew ac ti vi ti es : Air Force - 82 Navy - OS DLA - GS User activity: Army - AR 16 ?rparing -ac%ivi ty : (Project No. 6685-0723) Navy - -AS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
