ASTM_G_11_-_04_2012.pdf

Designation:G1104(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 last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()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 specifies 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 inparentheses 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 limitations 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 Steel(Withdrawn2013)3G14 Test Method for 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for Holiday Detection in Pipeline Coat-ingsG70 Test Method for Ring Bendability of Pipeline Coatings(Squeeze Test)(Withdrawn 2013)33.Summary of Test Method3.1 The effects of outdoor weathering on pipeline coatingsafter 6,12,and 24 months exposure are determined visuallyand by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 Since 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 conditions 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 uniform 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 weather 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 nonconductive 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 capable of beingduplicated on a production scale.NOTE1Pipe having a nominal diameter of 33.4-mm(1-in.nominal)1This test method is under 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 previous 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 website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 G70.7.2 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.”Theremainder 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 fol