1、Designation: G 17 07Standard Test Method forPenetration Resistance of Pipeline Coatings (Blunt Rod)1This standard is issued under the fixed designation G 17; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This accelerated test method is used to determine therelative resistance of steel pipeline coatings to penetration ordeformation b
3、y a blunt rod under a specified load. The testmethod is intended to apply to the testing of all types ofnonmetallic pipeline coatings subjected to various tempera-tures.1.2 The values stated in SI units to three significant deci-mals are to be regarded as the standard. The values given inparentheses
4、 are for information only.1.3 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 pr
5、ior to use.2. Summary of Test Method2.1 The depth or rate of penetration or deformation that iscaused by a weighted blunt rod to a coating system applied tosteel pipe is measured over a period of time with a micrometerdepth gage. Three consecutive identical readings taken atspecified intervals concl
6、ude the test.3. Significance and Use3.1 Since pipeline coatings are subjected to concentratedpressures exerted by the weight of the pipe and the backfill, thistest is intended primarily for determining the resistance of thecoating to penetration or deformation under controlled condi-tions.3.1.1 Defo
7、rmation of a compressible coating does not sig-nify a potential weakness in underground burial service, if thecoating is not penetrated. Deformation cannot be compared topenetration into and through a coating.4. Apparatus4.1 Test apparatus shall consist of a dead weight tester thatcan press the flat
8、 tip of a rod against the coated pipe. Theflat-tipped end of the rod contacting the coating shall have adiameter of 6.350 mm 6 0.0254 mm (0.250 in. 6 0.001 in.)and together with supplementary weight and any other weight-contributing parts shall have a total weight of 4.453 kg (9.817lb), resulting in
9、 a unit pressure of 14.060 kg/cm2(200 psi)against the coating. Detailed design of the apparatus is shownin Figs. 1-6 and Tables 1-4 show dimensions.4.2 Depth Gage, a device capable of measuring the penetra-tion movement of the rod accurately to 0.0254 mm (0.001 in.).4.3 Temperature Chamber, a thermo
10、statically controlledenclosure to provide heating and cooling of the specimen andtest apparatus (excluding depth gage) to within 62C (3.6F)of the desired test temperature. This equipment is optionalwhen the test can be run within 62C (3.6F) of the desiredtest temperature without its use.4.4 Temperat
11、ure Controlled Box, to fully enclose the testapparatus except the indicating means of the depth gage, asoptional equipment in cases where a test is to be run at atemperature higher than room temperature. The enclosure shallbe thermostatically controlled, capable of maintaining thetemperature to with
12、in 62C (3.6F) of the test temperature,which normally will be in the range of 23 to 76.6C (73.4 to170F).4.5 Thermometer, a temperature measurement device accu-rate to 60.5C (61F).5. Test Specimens5.1 The test specimens shall be 150 mm (6 in.) long andprepared with its surface preparation and coating
13、proceduresequivalent to that of production coated pipe. Duplicate testsshall be run.6. Conditioning6.1 The specimen shall be exposed to the test temperaturefor a period of 24 h before beginning the test. If the testtemperature is the same as room temperature, it shall be 21 to25C (70 to 77F).7. Proc
14、edure7.1 Perform the test at room temperature or at the selectedtemperature.7.2 Accurately measure the thickness coating in the area tobe tested. Assemble the sample and end plates. Position thesample in the test unit so that the known film thickness area is1This test method is under the jurisdictio
15、n 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. Published July 2007. Originally approvedin 1971. Last previous edition approve
16、d in 1998 as G 17 88 (1998) which waswithdrawn March 2007 and reinstated in July 2007.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.directly under the weighted rod and hold the sample in positionby use of the cap screws.7.3 Loosen
17、the shaft collar and allow the weight to rest onthe shaft guide. Using the depth gage take a measurementwithout the load applied. Raise the weight and tighten the setscrew in the collar so that the weight rests on the shaft.7.4 Take measurements every 24 h.7.5 Continue the test until the maximum pen
18、etration hasbeen reached as evidenced by three consecutive unchangedmeasurements.8. Calculation8.1 Calculate the net change and the percent change asfollows:CN5 MF2 MI(1)CP5 CN/T! 3 100where:CN= net change,MF= final measurement,MI= initial measurement,CP= percent change, andT = film thickness.9. Rep
19、ort9.1 The report shall include the following:9.1.1 Complete identification of specimens, including nameand code number of coatings, size of the pipe, source,production date, production run number, and any other infor-mation that may be pertinent to identification,9.1.2 Film thickness of the specime
20、n at the test location inmillimetres (inches),9.1.3 Temperature at which the test was conducted,9.1.4 Final and initial measurements in millimetres (inches),9.1.5 Whether the weighted rod has caused penetration ordeformation,9.1.6 Net penetration or deformation in millimetres (inches)and the percent
21、 penetration or deformation, and9.1.7 Number of hours or days to net penetration or defor-mation.10. Precision and Bias10.1 Precision Data are limited to two adjacent specimenstaken from the same source coated pipe and assume that thecoating process was uniform with respect to pipe surfacecondition
22、and coating material. Specimens that were notadjacent in the as-produced condition or were taken fromdifferent lengths of pipe may represent differing processconditions.10.2 RepeatabilityInitial and final measurements shouldbe 60.0127 mm (0.0005 in.) or 5 %.10.3 ReproducibilityThe results reported b
23、y one labora-tory should not differ from those of another laboratory by morethan 65 % of the net penetration.11. Keywords11.1 blunt rod; coating; compression; deformation; load;penetration; pipeline; resistanceFIG. 1 Blunt Rod Penetration TesterG17072FIG. 2 Blunt Rod Penetration Tester, AssemblyFIG.
24、 3G17073FIG. 4FIG. 5G17074FIG. 6TABLE 1 Dimensions for Fig. 3Symbol mm in.A 1.59 0.063B 3.18 0.125C 7.94 0.313D 8.73 0.343E 9.53 0.375F 10.32 0.406G 12.70 0.500H 15.86 0.625I 19.05 0.750J 20.64 0.813K 25.40 1.000L 38.10 1.500M 55.56 2.188N 63.50 2.500O 76.20 3.000P 111.13 4.375Q 127.00 5.000R 184.15
25、 7.250S 215.90 8.500T 50.80 2.000U 88.90 3.500TABLE 2 Dimensions for Fig. 4Symbol mm in.A 0.79 0.031B 1.59 0.063C 3.99 0.157D 11.11 0.438E 12.70 0.500F 12.70 0.500G 12.71 0.500H 12.72 0.501I 13.49 0.531J 14.29 0.563K 15.88 0.625L 17.46 0.688M 19.05 0.750N 19.06 0.751O 25.40 1.000P 38.10 1.500Q 60.33
26、 2.375R 92.08 3.625S 101.60 4.000T 120.65 4.750U 141.29 5.563V 184.15 7.250W 203.20 8.000G17075ASTM 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 determina
27、tion 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 reapproved or with
28、drawn. 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 you feel that you
29、r 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 (sing
30、le 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).TABLE 3 Dimensions for Fig. 5Symbol mm in.A 1.59 0.063B 6.35 0.250C 6.35 0.250D 9.50 0
31、.374E 9.53 0.375F 9.55 0.376G 10.32 0.406H 19.05 0.750I 19.06 0.750J 19.07 0.751K 25.40 1.000L 64.29 2.531M 63.50 2.500N 101.60 4.000O 165.10 6.500TABLE 4 Dimensions for Fig. 6Symbol mm in.A 4.76 0.188B 6.35 0.250C 7.14 0.281D 13.49 0.531E 38.10 1.500F 44.45 1.750G 52.38 2.062H 63.50 2.500I 76.20 3.000J 88.90 3.500K 127.00 5.000LG17076
