ASTM G11-2004(2012) Standard Test Method for Effects of Outdoor Weathering on Pipeline Coatings《管道涂层受室外气候影响的标准试验方法》.pdf

1、Designation: G11 04 (Reapproved 2012)Standard Test Method forEffects of Outdoor Weathering on Pipeline Coatings1This standard is issued under the fixed designation G11; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of la

2、st revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is intended to define conditions for theexposure of coated pipe to weather.1.2 This test method specifi

3、es qualifications for the samples,procedure to be followed in exposure to weather, and proce-dure for evaluating effects of exposure including visual exami-nation and other tests.1.3 The values stated in SI units to three significant deci-mals are to be regarded as the standard. The values given inp

4、arentheses are for information only.1.4 This standard does 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 limi

5、tations prior to use.2. Referenced Documents2.1 ASTM Standards:2G8 Test Methods for Cathodic Disbonding of Pipeline Coat-ingsG10 Test Method for Specific Bendability of Pipeline Coat-ingsG12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on SteelG14 Test Method for

6、Impact Resistance of Pipeline Coatings(Falling Weight Test)G62 Test Methods for Holiday Detection in Pipeline Coat-ingsG70 Test Method for Ring Bendability of Pipeline Coatings(Squeeze Test)3. Summary of Test Method3.1 The effects of outdoor weathering on pipeline coatingsafter 6, 12, and 24 months

7、exposure are determined visuallyand by electrical means by comparing exposed samples ofcoated pipe with unexposed samples of coated pipe before andafter impact and bending tests. At the beginning of the test thestarting samples are qualified by a cathodic disbonding test.4. Significance and Use4.1 S

8、ince coated pipe may be stored outdoors for longperiods before burial, weathering tests of the type described inthis test method are needed to evaluate the stability of thesecoatings stored outdoors. The results obtained should betreated only as indicating the general effect of weathering.Exposure c

9、onditions vary greatly from year to year, from onepart of a year to another, and from locality to locality. Theresults of short-term exposure tests in the north are moremeaningful if exposure is started in the summer followed by awinter season. In southern areas where climatic conditions aremore uni

10、form throughout the year, the time of year whenshort-term exposure is started is less critical. In all localities,the longer the exposure period, the more reliable are the resultsobtained.5. Location of Test Sites5.1 Weathering racks shall be located in cleared areasrepresentative of local outdoor w

11、eather conditions.6. Apparatus6.1 RacksThe horizontal racks shall be any suitable pipestorage racks of sufficient height to prevent any undesirableeffects of vegetation growth during the period of exposure.Racks may be constructed from a variety of materials, but pipespecimens must rest on a noncond

12、uctive surface. An exampleof a suitable rack is illustrated in Fig. 1.7. Sampling7.1 Each starting sample shall consist of coated 26.7-mm(34-in. nominal) diameter steel pipe from a production lothaving a minimum length of 4.4 m (14.4 ft). The sample shallbe from a lot produced under conditions capab

13、le of beingduplicated on a production scale.NOTE 1Pipe having a nominal diameter of 33.4-mm (1-in. nominal)can be used and is the largest diameter that can be evaluated in accordancewith Test Method G10. Larger diameter pipes can be evaluated inaccordance with Test Method G70.1This test method is un

14、der the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applicationsand is the direct responsibility ofSubcommittee D01.48 on Durability of Pipeline Coating and Linings.Current edition approved Nov. 1, 2012. Published November 2012. Originallyapproved in 1969. Last pr

15、evious edition approved in 2004 as G11 04. DOI:10.1520/G0011-04R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM we

16、bsite.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.2 Each starting sample shall have a piece 600 mm (24 in.)long cut from one end by sawing for use in qualification testing(Section 8) and designated the “qualification sample.” Th

17、eremainder of each starting sample shall be designated the“sample.”7.3 The total number of samples for each coating in testshall be four, divided as follows:7.3.1 One to be removed after 6-months exposure,7.3.2 One to be removed after 12-months exposure,7.3.3 One to be removed after 24-months exposu

18、re, and7.3.4 One to be used for determining original control values,which should be obtained as soon as possible on receipt of thepipe.8. Procedure for Qualification Testing8.1 Test each qualification sample in accordance with TestMethods G8, Test Method B.8.2 Begin qualification testing at the same

19、 approximate timeas sample testing.8.3 If the results of the qualification testing are within theprecision limits given in Test Methods G8, consider thesamples to be reasonably equivalent and proceed with sampletesting.8.4 If the results of the qualification testing are not withinthe precision limit

20、s given in Test Methods G8, consider thesamples to be unequivalent and discontinue exposure testing.9. Procedure for Sample Testing9.1 Identify the test samples with a letter, number, orsymbol for ready identification after exposure. The markingshall not interfere with either the exposure or the tes

21、ting.9.2 Note and record the appearance of the sample.9.3 Measure and record the coating thickness in accordancewith Test Method G12.9.4 Check coating for holidays with the appropriatedetector, as described in Test Methods G62.9.5 Make two 80-mm (3-in.) long scribes through thecoating to bare metal.

22、 Begin one scribe at a point approxi-mately 230-mm (9-in.) from one end of the pipe and continueit for 80 mm along the length of the pipe; begin the other scribeat a point approximately 230 mm from the opposite end of thepipe and continue it for 80 mm along the length of the pipe.Make sure that one

23、scribe is on the top of the pipe, the other onthe bottom.9.6 Mount the samples on the rack as shown in Fig. 1 withone scribe facing skyward and one facing toward the ground.Group the three samples together so that like samples are lyingalongside one another.9.7 After exposure, again note and record

24、the appearance ofthe sample and check for holidays in the manner followed priorto exposure. Next examine the sample visually for cracking,checking, blistering, corrosion, undercutting from the inten-tional scribe, and any other form of impairment of the coating.9.8 Finally, cut a 300-mm (12-in.) spe

25、cimen from one endof the sample, where the scribe is facing downward, andsubject to an impact test in accordance with Test Method G14.In the impact test, position the specimen so that the scribe facesdownward.9.9 Subject the remaining 2.5 m (8.2 ft) to a bend test inaccordance with Test Method G10.

26、In the bend test, positionthe skyward face of the sample as the outside of the bend.NOTE 1All lumber is to be pretreated and painted.FIG. 1 Construction Details of Outdoor Weathering RackG11 04 (2012)29.10 Follow the procedure in 9.7, 9.8, and 9.9 on samplesremoved after each of the three exposure p

27、eriods and compareresults with those obtained on the control sample in 7.3.10. Report10.1 Report the following information:10.1.1 Results of qualification tests,10.1.2 Sample number and description of coating systemincluding: surface preparation, method of application, andcoating thickness,10.1.3 Ap

28、pearance of sample and presence or absence ofholidays prior to exposure,10.1.4 Appearance of sample, presence, or absence ofholidays after exposure, and duration of exposure,10.1.5 Visual evidence of coating failure as noted by 9.7,10.1.6 Results of impact and bend tests after exposure ascompared wi

29、th those for the control sample, and10.1.7 Type of environment and exposure.11. Precision and Bias11.1 The precision requirements for qualification testing in8.3 of this test method and the precision requirements given inTest Method G12 shall apply. Variations in samples andqualification samples sha

30、ll be within respective precision limitsfor this test method to be valid. Bias cannot be determinedsince no generally accepted standards are available. The resultsobtained should be treated only as indicating the general effectof the weather directly effecting the test samples during the testperiod

31、at the chosen test site. Exposure conditions vary greatlyfrom year to year, from one part of the year to another, andfrom locality to locality.12. Keywords12.1 coated pipe storage; outdoor weathering; pipeline coat-ings; weather resistanceASTM International takes no position respecting the validity

32、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 such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject t

33、o 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 invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.

34、 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 received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is

35、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).G11 04 (2012)3