ASTM D5642-1999(2004) Standard Test Method for Sealed Tube Chemical Compatibility Test《密封管道化学兼容性试验的标准试验方法》.pdf

《ASTM D5642-1999(2004) Standard Test Method for Sealed Tube Chemical Compatibility Test《密封管道化学兼容性试验的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM D5642-1999(2004) Standard Test Method for Sealed Tube Chemical Compatibility Test《密封管道化学兼容性试验的标准试验方法》.pdf（3页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: D 5642 99 (Reapproved 2004)An American National StandardStandard Test Method forSealed Tube Chemical Compatibility Test1This standard is issued under the fixed designation D 5642; the number immediately following the designation indicates the year oforiginal adoption or, in the case of

2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers procedures for evaluating theinteraction of electrical insulation compo

3、nents used, or in-tended to be used, in electrical insulation systems.1.2 This test method is useful for determining compatibilitybut additional testing may be required depending upon appli-cation.1.3 This test method may also provide useful informationabout the behavior of selected insulating mater

4、ials whencompared to a reference value as opposed to a referencesystem.1.4 This test method does not cover systems which operatein liquids or gases other than air.1.5 The values stated in SI units are the standard in this testmethod.1.6 This standard does not purport to address all of thesafety conc

5、erns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. See also 8.2.4,8.3.1 and 8.3.2.12. Referenced Documents2.1 ASTM Standards:2D 149

6、Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 1676 Test Methods for Film-Insulated Magnet WireD 1711 Terminology Relating to Electrical Insulation3. Terminology3.1 Definitions:3.1.1 magnet wireSee Terminol

7、ogy D 1711 for the defi-nition of this term.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging test, na process of exposure, to a specified setof conditions for a defined period of time, which results in anirreversible change in one or more physical, chemical, electri-cal, or thermal cha

8、racteristics of a material.3.2.2 candidate system, nthe proposed electrical insula-tion system to be evaluated.3.2.3 electrical insulation system, nan intimate combina-tion of insulating materials with conductors, as used in elec-trical equipment.3.2.4 insulation system class, na standardized design

9、ationof the temperature capability of the electrical insulation sys-tem. It is expressed by both numbers and letters as follows:System Class105 (A)120 (E)130 (B)155 (F)180 (H)200 (N)220 (R)240 (S)3.2.5 reference system, nan electrical insulation systemwhich has been previously evaluated and found ac

10、ceptable.3.2.6 twisted pair, nfilm-insulated round magnet wire thathas been prepared in accordance with Test Methods D 1676.4. Summary of Test Method4.1 Acombination of specific materials is sealed in a limitedspace and subjected to a specific elevated temperature for aspecified time. Following this

11、 exposure the dielectric break-down voltage of the insulated conductors is used as a basis forjudging the compatibility of the candidate system.5. Significance and Use5.1 This test method is useful for evaluating a combinationof materials for potential use in an electrical insulation system.6. Appar

12、atus6.1 Oven, capable of maintaining the required exposuretemperature within 63 C.6.2 Glass Tubes with inside volume not exceeding 900 mLthat can be sealed. Two general types are described as follows:1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insula

13、ting Materials and is the direct responsibility ofSubcommittee D09.17 on Thermal Characteristics.Current edition approved March 10, 1999. Published May 1999. Originallyapproved in 1994. Last previous edition approved in 1997 as D 5642 97.2For referenced ASTM standards, visit the ASTM website, www.as

14、tm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.1 Fl

15、anged High Temperature Glass Tubes which aredesigned to be sealed with metal rings and gaskets arepreferred.6.2.2 Glass Tubes, which can be fusion sealed after theaddition of all materials are acceptable alternatives.6.3 Gasket Materials for use with tubes described in 6.2.1.6.3.1 Type TFE (Tetraflu

16、oroethylene) or FEP (Perfluoroet-hylene Propylene) Fluorocarbon.6.3.2 Hexafluoropropylenevinylidene fluoride elastomercan be used for exposure temperatures not exceeding 155 C.6.4 Apparatus in conformance with Test Method D 149 tomeasure dielectric breakdown voltage.7. Material Specimens7.1 The spec

17、ific list of materials to be tested is to beestablished by agreement between interested parties.7.2 Represent each of the non-metallic components of theelectrical insulation system, with the exception of an impreg-nating varnish and insulated conductors, with a specimenhaving a minimum mass of 250 m

18、g.7.3 Insulated Conductor Specimens:7.3.1 Use film insulated magnet wire twisted pairs con-structed in accordance with Test Methods D 1676;18AWGheavy build is preferred.7.3.2 For conductors not suitable for constructing twistedpairs, use specimens having a minimum length of 200 mm.NOTE 1An example o

19、f conductors not suitable for constructingtwisted pairs is fibrous wrapped conductors. They shall be represented asdescribed in 7.3.2.7.4 Apply impregnating varnish to the insulated conductorsand cure per manufacturers recommendations.8. Procedures8.1 Tube Loading and Sealing:8.1.1 Clean and dry tub

20、es as needed prior to use.8.1.2 Prepare one tube with the materials that represent thereference system. Insert all materials as specified in Section 7into the tube. For each magnet wire type insert a minimum offive twisted pairs or three straight lengths prepared in accor-dance with Section 7.NOTE 2

21、It is acceptable to place a stainless steel screen as a barrier torestrict physical contact of the insulated conductors from the othermaterials in the tube, to avoid damage to the insulated conductorspecimens.8.1.3 Prepare one tube for each candidate system in thesame manner in which the reference s

22、ystem tube was prepared.8.1.4 Condition each unsealed tube and its contents for 1 hat 105 C. The purpose of this procedure is to minimize themoisture content of all materials in the tube. It is an acceptableprocedure to condition materials outside the tube to allowsufficient drying prior to 8.1.2 an

23、d 8.1.3. Concurrently condi-tion tubes and gaskets.8.1.5 Certain materials, including but not limited to hygro-scopic papers, may require additional conditioning to removemoisture. If agreed upon by interested parties, higher tempera-tures and times for drying may be used. Select a time andtemperatu

24、re that do not cause loss of other volatile materials orcause thermal decomposition.8.1.6 Seal tubes within 1 min after conditioning, and leaktest immediately thereafter in accordance with 8.1.6.2.8.1.6.1 Seal flanged glass tubes by applying a sufficienttorque to ensure a seal that is leak free.Ator

25、que of 3.4 Nm (30inch-pounds) in increments of 0.56 Nm (5 inch-pounds),alternating between bolts to tighten evenly and securely hasbeen found acceptable for this purpose.8.1.6.2 Check glass tubes for leaks using the followingprocedure: Submerge the still warm tubes into room tempera-ture tap water f

26、or a minimum of 2 min. Observe the tubes afterthey have reached room temperature for condensation on theinner walls. Condensation is a result of leakage.8.1.6.3 Do not use tubes that exhibit leakage.8.2 Aging:8.2.1 Place the tubes into an oven that is at room tempera-ture.8.2.2 Apply power to the ov

27、en and allow it to attain theaging temperature.8.2.2.1 Sealed tubes may be placed into a heated oven, butit should be recognized that the thermal shock will causestresses that may result in cracking of the glass tubes. Do notuse any tubes that crack as a result of such treatment.8.2.3 The aging temp

28、erature shall be 25C greater than thenumerical insulation system class of the reference system.8.2.4 After a minimum of 336 h exposure to the agingtemperature, remove the tubes from the oven.As an alternative,to reduce the extent of thermal shock, turn off the power to theoven and allow the oven and

29、 tubes to cool to room temperature.(WarningUse protective equipment including safety glassesor face shield and high temperature gloves when handlingheated glass tubes. Glass tubes may shatter upon beingsubjected to thermal shock.)8.3 Procedures for Testing:8.3.1 Open the tubes within 72 h of the com

30、pletion of aging.Remove the insulated conductor specimens. (WarningUseadequate ventilation when opening the tubes. Fumes emittedfrom the tube may be toxic.)8.3.2 Determine the dielectric breakdown voltage of twistedpair conductors in accordance with Test Methods D 1676.8.3.2.1 Warning Lethal voltage

31、s may be present duringthis test. It is essential that the test apparatus, and allassociated equipment that may be electrically connected to it,be properly designed and installed for safe operation. Solidlyground all electrically conductive parts that any person mightcome in contact with during the

32、test. Provide means for use atthe completion of any test to ground any parts which: were athigh voltage during the test; may have acquired an inducedcharge during the test; may retain a charge even afterdisconnection of the voltage source. Thoroughly instruct alloperators in the proper way to conduc

33、t tests safely. Whenmaking high voltage tests, particularly in compressed gas or inoil, the energy released at breakdown may be suffcient to resultin fire, explosion, or rupture of the test chamber. Design testequipment, test chambers, and test specimens so as to minimizethe possibility of such occu

34、rrences and to eliminate thepossibility of personal injury.8.3.3 For straight conductor specimens prepare electrodesby applying 6 mm wide thin metal foil to the center of a 13 mmD 5642 99 (2004)2wide, 75 mm long strip of pressure sensitive tape. Apply twoelectrodes at right angles to each specimen a

35、t intervals approxi-mately13 the length of the specimen and wrap smoothly andfirmly around the specimen a minimum of 1 and12 completeturns, with the metal surface of the foil in contact with theinsulation.8.3.4 Modification of electrode configuration may be nec-essary for specific applications: Such

36、 modification shall be asagreed between interested parties.8.3.5 Record the results.9. Interpretation of Results9.1 For each type of conductor taken from each tube,calculate the average of at least five dielectric breakdownvoltage values using all of the dielectric breakdown voltagesobtained. The cr

37、iteria to be used for eliminating any onedielectric breakdown voltage value from the calculation of theaverage is to be determined by agreement between interestedparties prior to testing.9.2 A comparison of the average dielectric breakdownvoltage values obtained for the conductor specimens takenfrom

38、 the candidate and reference tubes is the basis fordetermining the compatibility of the materials in a candidatesystem. The maximum acceptable difference between theaverage values shall be established by agreement betweeninterested parties.10. Report10.1 Report the following information:10.1.1 Desig

39、nation and description of the reference andcandidate system including all components,10.1.2 Pre-conditioning or drying conditions,10.1.3 Aging temperature, and10.1.4 Length of exposure time.10.1.5 For each type of conductor taken from each tube,10.1.5.1 Individual dielectric breakdown voltage values

40、,and10.1.5.2 Average dielectric breakdown voltage value.11. Precision and Bias11.1 No statement is made about either the precision or biasof this test method since the result merely states whether thereis conformance to the criteria for acceptability defined in termsof this test method.12. Keywords1

41、2.1 chemical compatibility; electrical insulation system;sealed tubeASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any

42、 such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are in

43、vited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not receive

44、d a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 5642 99 (2004)3