1、- MIL-B-14413A 66 9779706 O128b3 T M - MILITARY . 8PECIFICATI ON Supers eding 11rb14413( si 601 MILITARY Mn-STD-lo5 Balloons, Meteorological; Pglot, Ceiling and Sounding, Packaging of Rubber, Sampling and Teeting, Sampling Prpcedurcs and Tables for Inspection by Attribute0 (Copies ui Epeciflcatlone
2、and standardc required by contractors in . Connection with specific procurement functions should be obtained from the proouring activity or as directed by the contracting officer. sn8 amber or symbol should be etlpulated when requesting coplee) 8peqifiCatlOn to the extent epclfieb herein. Unless oth
3、ervies Indicated, the Both the title 2.2 Other publications.- The following documente form 8 part of this -%esue in effect on the date of invitation for bide shall apply: FTATICNAL BUREAU STANDARDS JalRNAL F RESEARCi, F TEE NATIONAL BUREW W STANDAEU)S, Volume . 53, 110.6, December 1954, Reeearch Pap
4、er No. 2557, “Aerological SdfXI.3 Eablcsn.“ (, .- Elongatfon at break Min. 650% Tensile strength Min, 1500pi - Tensile strass (Modulus) at (Min. 250 pi 600% Elongation (Mx, 600 pi C. When tested at JOo C Elongqtfon at break Min. 500% with no rign of cold flmy , 2 Column B Min 7,50 Min 1500 pt Mln 25
5、0 pi Min 6.50 Min 1500 pi Min 250 pi k Mo pi Min 4.50 . f Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2.3 Neck.- The balloon shall krsve B tubular neck of uniforEly r63mil c
6、ross-sectioructitrel-weakness of tbe balloon fib can develop during storage. 3.8.1 Inclosure.- The following instructions ihall be printed legibly on en apprcprlataly sized, single sheet of paper# one of which rhllbe lnclorod in each lndividud balloon container: 3.7 Dusting.- Balloons shall be duste
7、d evenly inside and outside vith a , . 1 _. Balloon film has an initial thicknees of aIryraximately O.O35 inoh aad e thAclaiesa at burst of appsaxlmatey O.ooO1 inch. frwilr material and I slight sitriace abrasion cavsed by hanllng can Imp Copyright Communications - Electronics Command Provided by IH
8、S under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-14413A 66 W 7777706 0128872 O W fitting the neck over rigid tube6 or cylinders of circular aros8 motion whose outside diameters shall be 7/8 inch and b1/8 inches. The neck shall fit mer
9、the 7/8 inch tube or cylinder without stretching, but ehall require rtrrtohing to f it over the 1-1/8 inch tube or .cylinder . 4.7 Neck strength testa The five balloons ielectsd in SCCOrdanCe ldth 4.4.3.1 for physical propertlee tests shall be subJected to the folloWhg t08t prior to being subJected
10、to the physical propertlea teste. 4.7.1 Purpose of test.- This test i8 Intene to demonstrete that the balloon neck and the balloon rilm adJacent to the neck ha8 sufficient rtrength to withstand the normal streams of an inetmimont flight. 4.7.2 Apparatus for teot.- Tho apparatuo ihall consist of a Oe
11、U-tight- ening Jaw which grasps the neck of the balloon and to which a 40 pound load Including the weight of the Jaw can be added. The balloon shall be wrapped around a smooth rod not less than one inch in diameter so that no moTe than three inches of the balloon itself Is permitted to extent below
12、the rod when the load is applied. The rod and balloon shall be suspended 10 feet from the floor of the teoting area. 4.7.3 applicable methods of that 8tt%ndardb %a% fm utllzng the Rureau of Standards procedure is as indicated in thia anit the following Bub-paragraphs for individual testo. a. The pat
13、ch shall be inflated at such a rate th% rupture (burst) occurs in between 15 and 20 minutes b b, The median of the results from the test6 of the nine specimens from each balloon shall be recorded ea the . final result far each teet (tensile stress, tensile strength and elongation) far that balloon.
14、CUy cm such value (i of 5 balloons) shall fa31 below the values specified In 3.2.2 QQ: the lot rapmaentea by the teet ipacimens shell be comidared as hving falle the feet and rhll bb CAW for rsJeotlm cd the lot, 11 / . .si- ,+,._l,_ - ._“._. - - . - .-i. .-, - Copyright Communications - Electronics
15、Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-34433A 66 7777706 0328874 4 I MIL-B- 144 13A( CigC ) Figure I - U t Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for Re
16、saleNo reproduction or networking permitted without license from IHS-,-,-408.3 Tensile stress( modulus .- The tenaile stress shall be measured at 6 percent elongation, and ohal be determined according to Methci3 4131 of Federal Test Methpd Standard 601 or by following the procedure otrtlfned in Rese
17、arch Paper 2557, Volume 53, No.6, December 1954, of the Journal of Research of the Nationa1,Bureau of Standards, except for temperature. Tho resulte of this test shall be determined and recorded prior to the temile strength arid elongation tests. the Federal standard method i8 specified in that stan
18、dard. Detenaination of results wing the “ES method is by observing the preesure when the patch has eset at this point and patch inflated so that it Just touches the pistons? and substituting this value for “P“ and 6.00 for %ln the following equation: 4.8.3.1 Test results.- The method of determining
19、test results using . reached the 600 percent elongation point (pistons 6 1.35 P Re * . at Where 86 - Tensile strength at 6005 elongation P = Differential pressure acros patch at Re 9 Equatorial radius of patch ait 6m elongation a P Radius of original exposed patch t I Original thickness of film elon
20、gation This test shall be conucted both before and after aging of the balloon film using separate specimens. 4.8.4 Tensile strength.- This test is defined as the pressure required The tensile strength shell be to cause the test specimen to rupture or burst. determined according to Method 4111 of the
21、 Federal Test MethoCl8 Standard 601 or by the procedure outlined in the National Bureau of Standards document cited in 4.8.3 except for temperature Federal etaildard method is specified in that standard. That using the National Burau of StanQrde procedure is by observing the pressure at rupture or b
22、urst of the patch and the spacing between the pistons (See 4.8.i.d) after burrt an rubirtitutng them values in the following equation: 4.8.4.1 Test results.- The method of determining test results using the .- . i P - Differential prcseurc acros8 patch at burst Re = Equatorial radius of patch at bur
23、et a - rigiaal radius of exposed patch t = riginal thicknere of patch Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-LY413A bb W 7777706 0128876 W . “ mia test shall be con
24、ducted before and after .ging of the balloon filia ueing separate tapecimens . 4.8.5 Elo ation Elongation at buret shall be determined according to Method 4121 +- o Federal Teet Method Standard 601 or by the procedure out!,irwd in the National Bureau of Standardo document a8 specified in 4.8.3. Thle
25、 tart shall be conducted beore and after aging of toit sampler, uing meparate specimens . 4.8.5.1 Test results Teet results, when using the Federal standard method, shall be determined as specified in that standard. Determination by the National Bureau of Standards Method is given as the ratio of th
26、e dism6ter of the inscribed circle at burst of the patch to that of the arlgfmZ d.wt.r of the circle. Alternatively, elongation can be determined am foliowe: EB = 2.60 R a Where % = Elongation at buret R = Equatorial radiua of patch at burst (meaeured by pietone) a - miginal radius of patch 4.8.6 Ac
27、celerated aging and associated tests .- Accelsrated aging of balloon film is intended to eetimate the relative resistarice of cured neoprene latex balloons to aging. No irect correlation between the accelerated .ging and the natural life of neoprene ballons le given or implied. The prouedure consist
28、s of subJect1n.g test samples having previoualy determined phyaical properties to controlled elevated temperatures in air at atraospheric prei6ure. It does not include exposure to light. Changes in elongation at break, teasile : strength, and tensile stress (See 4.8.3, 4.8.4, and 4.8.5 ) are the crl
29、teria of deterioration. 4.8.6.1 Apparatus.- An air oven ehall be uaed and shall meet tho fOllW- iag rqulremente: 8. a. - I Provision shall be made to lay test eamplee between two layer8 of cheese cloth on a perforated platfam. The heating medium for the aging chanber shall be circulated air at atmos
30、pheric pressure. The air ehall be circulated by wahr of mechanical agitation. Tbe air muet not am in aontact with any electric motor bmish dirchrrge OO. other mouroe of ozone. The ource of heat eh11 be looatad autside of the wing chamber Prapar. 14 - Copyright Communications - Electronics Command Pr
31、ovided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-F ,f- NIL-B-3433A 66 m 9999906 0328877 T W e. The temperature shall be controlled automatically. f, A recording thermometer shall be used to record and maintain the tempereture in
32、the aging chamber. g. Actual checks of the oven temperature shall. be by means of a maxirmun reading thermometer. 4.8.6.2 Test procedure.- Three of the teet sample6 (20 in, by 20 inre or 30 in. by 30 in.) selected as in 4.8 are used for the accelerated aging Of the balloon film. The wen shall be pre
33、-heated to operating temperature (lOOC). Aging shall be conducted at 100C i 1 for a period of 8 hours. The test specimens (dumb bell or square ehapeone concentratim. The method used far analysio ehall be absorption of theozone by a buffered solution of potassium iodide in water and memurenient of th
34、e idne liberated by titration with sodium thiOsulphatt3. b. !Che test chamber shall be equipped with a renimbie rack in which the previously elongated specimen8 may be placed in the test chamber. Six dumb-bell specimens (two each frm the ihre three pcstches (one each frm the three 30 Inch by 30 inch
35、 samples) selected for testing of phyeical properties teets and unaged shall be used for this teet. The specimen8 or patches eb11 be elongated 60$ for the test. Provision shall be made for clamping the dumb-bsll epeciPien8 on the test rack in that condition or for elongating them on the rack when ue
36、lng the Federal standard method. One inch bench mark13 ahall be placed m the dumb-bell epecimem to indicate elongation to W. Elongation, wing the patch (NES) method shall be as in 4.8. The eealed-off patch bax Wia the pawh t L elongated 600% shall be placed on the test rack. The patch rhall ramsib e
37、longated (inflated) 6M$ during the teet. 4.10.2.1 Conditioning.- The ozone chamber ehall be allowed to reoh equilibrium (steady or constant concentration), and the rack ccmtaining the epeoimens rhall be placed in the chamber. 4.10.2.2 Concentration.- The ozone concentration rhall be mea6umd (determi
38、nud! ias complieiace with 3.2.4 twice during the period ob any me test and shall be maintainedl constant during the test. Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 1 MIL-B-
39、14423A 66 = 9997706 0128879 3 4.10.3 Test resu.ts- A specimen shall be coneldered as having failed if it breaks during the test or if it shows aigris of deep cracke or holes at any mea other than where the bench marks arc applied. A balloon shall be considered 8s having failed the teat if more than
40、two dumb-bell specimens OF more than one patch from that balloon falls, Failure of mcre than one balloon to paso the tent shall be cause for rejection of the lot repreoente by the test specimen8 or patches. 4.11 Burst test.- Five of the balloons, selected in accordance with 4,1*3.1 ehall be utilized
41、 for this teet. that the balloon io capable of expansion to a volume which will pedt flights to 1001ooO feet altitude when flom with the lift specified in 3.3. not a substitute for theflightteet, and ability of the balloons to meet, %hie teet does not constitute a waiver of the flight requirements o
42、r test thereof. The test is intended to demonstrate It ie 4.11.1 Test apparatun .- The f ollowlng equipment and instollation are required to this test: 8. A blower capable of delivering air at atmospheric pressure at a rateof not less than 80 cubic feet per minute . An air volume meter reading in cu
43、bic feet. b. C. A nozzle of a size suitable for attachment to the balloon neck. The nozzle shall point vertically downward and shall be located at 8 hei;. (Level A, level B, or level C.) c . The specif IC paragraphs of Specification MIL-B-14417( Si definitive quality as8urance provision8 established
44、 in this spccification and the contract. The amount of verification tnepcction by the Ooverwnt Kill be adjusted to make meximum utilization of the ccmtr8ctor quality control system and the quality history of .the prOBu%, and Will nCrrniallybe identified by the categories listed below: 8 Type A -The
45、total of that inspection set forth in the Quality Asnirance Jh.ovisions of this specification or the contract. Included in this category is that amount of lmpection referred to as norms1 and titened inspection by Military Standard 105. . b. Type E-. That inepcction set forth la the Quality . Aesurur
46、ce Prolrisione of this specification ar the contract reduced in amount under the reduce intipea- tia VOVlrim Of MIlIW Staabsrd 18. . f 19 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from I
47、HS-,-,-MlL+14413A(SigC) C. Type C-A reduced inspection procedure resulting in a moterial reduction in the amount of inspection set forth in the Quality Assurance Provisions of this tpucification, The amount of inspection is leu than that provided for in type B and It based upon a conrlrtently accept
48、able product resulting from a planned quality control system voluntarily employed by contractor in the production of the product. 6.5 Balloon lift.- If the manufacturer believes that the specified performance can ba obtained with a lower Iiftke 3.3), he may request, in mitina, of the contracting off
49、icer, that balloons supplied by him be given a lower total lift. lhe contractor shll designate the propored total lift in the request. Upon approval of the contracting officer, the lower total lift shall then be used in all future testing of balloons made by thot contractor on the order or contract involvd. 6.6 Dsfinltions. - The following definitions of
