ASTM G6-2007 Standard Test Method for Abrasion Resistance of Pipeline Coatings《管道涂层抗磨性标准试验方法》.pdf

1、Designation:G607Standard Test Method forAbrasion Resistance of Pipeline Coatings1This standard is issued under the fixed designation G 6; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parent

2、heses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method of accelerated test is a procedure fordetermining the relative resistance of steel pipeline coatings toabrasion by a slurry of coarse

3、 abrasive and water. The methodis intended to apply to the testing of all types of electricalinsulating pipeline coatings and tapes, including thermoplas-tics, thermoset, and bituminous materials.1.2 Pipeline coatings are not normally subjected to the typeof abrasion herein specified.1.3 Metallic pr

4、otective coatings such as zinc may be com-pared visually, but do not meet the electrical requirements ofthis test method.1.4 The values stated in SI units to three significant deci-mals are to be regarded as the standard. The values given inparentheses are for information only.1.5 This standard does

5、 not purport to address all of thesafety concerns, 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.2. Referenced Documents2.1 ASTM Stand

6、ards:2G12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on SteelG62 Test Methods for Holiday Detection in Pipeline Coat-ings3. Terminology3.1 Definition:3.1.1 holidays, nsmall faults or pinholes which permitcurrent drainage through protective coatings on steel pipe

7、.4. Summary of Test Method4.1 Apparatus and materials are described whereby coatingson steel pipe are worn away by an abrasive slurry contained ina horizontally revolving drum. Specimens extend through bothends of the drum and are electrically insulated from contactwith the test apparatus.4.2 Period

8、ic measurement of the electrical resistance be-tween the specimen and the drum indicates the degree ofabrasion resistance of the coating.5. Significance and Use5.1 This procedure defines a test method for comparing therelative resistance of pipeline coatings to abrasion.5.2 Abrasion resistance may b

9、e used to specify optimumcoating thickness of candidate materials both in developmentand research work to study new coating systems or methodsand in quality control.6. Apparatus6.1 DrumA cylindrical steel container suitable for testingnine specimens simultaneously. Figs. 1-3 show constructiondetails

10、 which may be altered at the cap assembly if desired. Avalve shall be provided to release any pressure built up duringtest.6.2 Apparatus for Revolving the DrumAny suitable appa-ratus used to revolve the drum at 30.48 m (100 linear ft)/min.A modified jar rolling mill3has been found satisfactory forre

11、volving the drum.6.3 Thickness Gage, to be used in accordance with TestMethod G12.6.4 Holiday Detectors, low-voltage wet-sponge type forthin film coatings (coatings thinner than 20 mils), and high-voltage type for thick film coatings (coatings thicker than 20mils).NOTE 1Low voltage detectors are use

12、d to locate pinholes, voids, or1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.48 on Durability of Pipeline Coating and Linings.Current edition approved July 1, 2007. Publi

13、shed July 2007. Originally approvedin 1969. Last previous edition approved in 1998 as G688(1998) which waswithdrawn March 2007 and reinstated in July 2007.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM

14、Standards volume information, refer to the standards Document Summary page onthe ASTM website.3The sole source of supply known to the committee at this time, to provide ameans for revolving the drum is Figure 801-V Jar Mill available from U.S.Stoneware, Inc.,Akron, OH. If you are aware of alternativ

15、e suppliers, please providethis information to ASTM Headquarters. Your comments will receive carefulconsideration at a meeting of the responsible technical committee,1which you mayattend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State

16、s.thin spots in pipeline coatings. The potential used with wet-spongedetectors can be up to 100 V DC. Procedures for using these detectors arefound in Method A of G 62. For use of high voltage detectors operating inthe 900 to 20 000 Vdc range, see Method B of G 62.6.5 Volt-ohm-meterAny electrical te

17、st instrument formeasuring electrical resistance of the circuit.7. Reagents and Materials7.1 The test slurry shall consist of the following:7.1.1 Aluminum Oxide Grit,413.6 kg (30 lb).7.1.2 Tap Water, 5.68 L (112 gal).8. Test Specimen8.1 A 19.1 mm test specimen 406 mm (16 in.) long shall beprepared w

18、ith its surface preparation and coating proceduresequivalent to that of production coated pipe. Only holiday-freespecimens, in duplicate, shall be used in this test.8.2 Control specimens shall be included in each test, theselection of which is optional with the user.9. Conditioning9.1 The specimen s

19、hall be exposed to a room temperature of21 to 25C (70 to 77F) for a period of 24 h before beginningthe test.10. Procedure10.1 Perform the test at a room temperature of 21 to 25C(70 to 77F).10.2 Measure and record the coating thickness of eachspecimen in accordance with Test Method G12.10.3 Check all

20、 specimens or holidays using an appropriatedetector.10.4 Position the specimens in the drum taking care not todamage the coating.10.5 Load the apparatus with 13.6 kg (30 lb) of unusedabrasive and 5.68 L (112 gal) of water.4The sole source of supply of aluminum oxide abrasive, No. 3 mesh, Type TA,unt

21、umbled, known to the committee at this time is Exolon Co., Tonawanda, NY14150. If you are aware of alternative suppliers, please provide this information toASTM Headquarters.Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.Dime

22、nsions for Fig. 1:Symbol mm in.A 0.15 0.006B 2.28 0.090C 3.17 0.125D 4.76 0.188E 6.35 0.250F 19.05 0.750G 25.40 1.000H 31.75 1.125I 38.10 1.500J 47.63 1.875K 136.53 5.375L 149.23 5.875M 355.6 14.0N 406.4 16.0NOTE 1Estimated weight includes water and abrasive 39.5 kg (87 lb).FIG. 1 Abrasion-Tester As

23、semblyG607210.6 Test each specimen for electrical resistance after seal-ing the drum by using the volt-ohm-meter. Immerse thespecimen in the slurry at the time the electrical resistance ismeasured. Reject and replace any specimen showing less thaninfinite resistance.10.7 Revolve the drum at the rate

24、 of 30.5 m (100 linearft)/min.10.8 Determine the electrical resistance at 25-h intervals fora test period of 200 h.10.9 Relieve the pressure built up during the test by openingthe release valve each time the electrical resistance is mea-sured.11. Report11.1 The report shall include the following:11.

25、1.1 Complete identification of test specimens, includingname and code number of coating, size of the pipe, productiondate, production run number, and any other information thatmay be pertinent to identification,11.1.2 Date of starting and of terminating the test,11.1.3 Coating thickness of the test

26、specimen before testingand minimum coating thickness after testing,11.1.4 Volt-ohm-meter readings at 25-h intervals, and11.1.5 Description of coating appearance after testing.12. Precision and Bias12.1 Precision data are limited to two adjacent specimenstaken from the same production-coated pipe, as

27、suming that theproduction process was uniform with respect to pipe surfacecondition and coating material. Specimens that were notadjacent in the as-produced condition, or were taken fromdifferent lengths of pipe may represent differing processconditions.Dimensions for Fig. 2:Symbol mm in.A 1.59 0.06

28、3B 3.18 0.125B16.35 0.250C 12.70 0.500D 19.05 0.750E 22.23 0.875F 25.40 1.000G 38.10 1.500H 41.25 1.624I 41.28 1.625J 44.45 1.750K 50.8 2.0L 127.0 5.0M 165.1 6.5N 266.7 10.5O 304.8 12.0P 349.25 13.75Q 355.6 14.0FIG. 2 DrumG607312.2 RepeatabilityWhen more than one test of the samecoating material is

29、involved, the standard deviation of theresults should not be greater than 1.0 times the hourly timeinterval between inspections for the specific coating material.The standard deviation5of a set of numbers is the square rootof the average of the squares of the deviations of the numbersfrom their aver

30、age. The standard deviation of two or morespecimen results may be found by the following procedure:Standard deviation, s51/nn(X22 (X!2!1/2# (1)where:(X = sum of all values of X, from X1to Xninclusive,n = number of observed values (observations), ands = standard deviation, the root-mean-square (rms)

31、de-viation of the observed values from their average.12.3 ReproducibilityAgreement between laboratoriesshould be such that the standard deviation of the results for aspecific coating should not be greater than 1.5 times theinspection time interval.13. Keywords13.1 abrasion; coatings; pipeline; revol

32、ving; slurry5For more information see the ASTM Manual on Presentation of Data andControl Chart Analysis, STP 15D, October 1976.Dimensions for Fig. 3:Symbol mm in.A 1.59 0.063B 3.18 0.125C 6.35 0.250D 7.94 0.313E 12.70 0.500F 15.88 0.625G 19.05 0.750H 22.23 0.875I 38.10 1.500J 25.68 1.281K 41.25 1.62

33、4L 41.28 1.625M 50.80 2.0N 51.05 2.250O 136.53 5.375P 149.23 5.875Q 165.10 6.500R 184.15 7.250FIG. 3 DetailsG6074ASTM 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 advi

34、sed that determination of the validity of any 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

35、reapproved or withdrawn. Your comments are invited 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

36、 you feel that your comments have not received 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).G6075