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ASTM G55-07(2019)

(Test Method)

Standard Test Method for Evaluating Pipeline Coating Patch Materials

Standard Test Method for Evaluating Pipeline Coating Patch Materials

SIGNIFICANCE AND USE
3.1 Holidays in pipeline coatings may be repaired by circumferential wrapping with a suitable pipe wrap tape. However, this technique is not always practicable and patching may be required. The effectiveness of a patch material depends upon its adhesion to the original pipeline coating to effect sealing.  
3.2 The results of this accelerated test have been found to yield comparative data useful for the selection of patching materials. The user is cautioned against the use of this method for absolute material properties characterization.  
3.3 This procedure provides an accelerated method by exposing the patch to a severe radius of curvature on small-diameter pipe. The specimen is also exposed to a stress voltage in the presence of a highly conductive electrolyte.
SCOPE
1.1 This test method provides an accelerated means of determining the relative sealing abilities of pipeline patching materials that are used to seal holidays in pipeline coatings on steel pipe. This test method is intended for utilization of specimens of pipeline coatings on small-diameter pipe, for representing coatings used for buried or submerged service, and where the purpose of the coating is to provide an electrical barrier between the steel pipe and its environment.  
1.2 This test method is not intended for evaluating patch materials that are overlapped upon themselves.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Sep-2019
ICS
23.040.99 - Other pipeline components
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.48 - Durability of Pipeline Coating and Linings
Current Stage
Ref Project

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ASTM G55-07(2019) - Standard Test Method for Evaluating Pipeline Coating Patch MaterialsASTM G55-07(2019) - Standard Test Method for Evaluating Pipeline Coating Patch Materials
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ASTM G55-07(2019) - Standard Test Method for Evaluating Pipeline Coating Patch Materials
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G55 − 07 (Reapproved 2019)
Standard Test Method for
1
Evaluating Pipeline Coating Patch Materials
ThisstandardisissuedunderthefixeddesignationG55;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 This test method provides an accelerated means of 3.1 Holidays in pipeline coatings may be repaired by
circumferential wrapping with a suitable pipe wrap tape.
determining the relative sealing abilities of pipeline patching
materials that are used to seal holidays in pipeline coatings on However,thistechniqueisnotalwayspracticableandpatching
mayberequired.Theeffectivenessofapatchmaterialdepends
steel pipe. This test method is intended for utilization of
specimens of pipeline coatings on small-diameter pipe, for upon its adhesion to the original pipeline coating to effect
representing coatings used for buried or submerged service, sealing.
and where the purpose of the coating is to provide an electrical
3.2 The results of this accelerated test have been found to
barrier between the steel pipe and its environment.
yield comparative data useful for the selection of patching
1.2 This test method is not intended for evaluating patch materials. The user is cautioned against the use of this method
for absolute material properties characterization.
materials that are overlapped upon themselves.
3.3 This procedure provides an accelerated method by
1.3 The values stated in SI units are to be regarded as the
exposing the patch to a severe radius of curvature on small-
standard. The values given in parentheses are for information
diameterpipe.Thespecimenisalsoexposedtoastressvoltage
only.
in the presence of a highly conductive electrolyte.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4.1 Test Vessel—A cylindrical glass battery jar (or
mine the applicability of regulatory limitations prior to use. equivalent), approximately 300 mm (12 in.) in diameter and
1.5 This international standard was developed in accor- 300mminheight.Onemagnesiumanodeshallbecontainedin
each battery jar, with a maximum of eight pipe specimens, and
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the witheachspecimenmeasuringabout25mm(1in.)indiameter
by approximately 300 mm in length of coated pipe. (See 4.3
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical and Fig. 1 and Fig. 2.)
Barriers to Trade (TBT) Committee.
4.2 Suspension—The suspension ring for supporting the
pipe specimens shall be an electrically nonconductive circular
2. Summary of Test Method
disk, measuring approximately 300 mm (12 in.) in diameter
3
and approximately 5 mm ( ⁄16 in.) in thickness. (See 6.4.) Drill
2.1 Patched pipeline coating specimens are suspended in an
1
a 15-mm ( ⁄2-in.) diameter hole through the center of the ring
aqueous, alkaline, low-resistivity electrolyte. The specimens
for external extension of the anode lead wire. Drill eight
areindividuallyconnectedtoamagnesiumanodeorrectifierat
3
apointexternaltotheelectrolyte.Thecoated,patchedpipeline suspension holes, about 45 mm (1 ⁄4 in.) in diameter, through
thesuspensionringforthepipespecimens;theseholesshallbe
specimens are sealed at the base and at all other areas except
1
centered 110 mm (4 ⁄2 in.) from the center of the suspension
the patch boundaries, such that the only paths for current flow
ring and evenly spaced around the ring at 45° increments as
areattheboundariesofthepatches.Currentflowineachpatch
measured from the center of the suspension ring.
area is averaged from monthly readings taken for one year.
4.3 Potential—A high-purity magnesium anode shall be
used, weighing approximately 2.3 kg (5 lb), and having an
1
open-circuit potential of approximately 1.7 d-c V relative to a
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
copper-copper sulfate electrode, and complete with a factory-
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
sealed lead wire. The magnesium anode may be replaced by a
Current edition approved Oct. 1, 2019. Published October 2019. Originally
controll
...

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5.1 Method A—Method A describes a quick, safe method for determining if pinholes, voids, or metal particles are protruding through the coating. This method will not, however, find any thin spots in the coating. This method will determine the existence of any gross faults in thin-film pipeline coatings.  
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1.1 These test methods cover the apparatus and procedure for detecting holidays in pipeline type coatings.  
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4.1 Damage to pipe coating is almost unavoidable during transportation and construction. Breaks or holidays in pipe coatings may expose the pipe to possible corrosion since, after a pipe has been installed underground, the surrounding earth will be moisture-bearing and will constitute an effective electrolyte. Applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges. Spontaneous holidays may also be caused by such potentials. This test method provides accelerated conditions for cathodic disbondment to occur and provides a measure of resistance of coatings to this type of action.  
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SCOPE
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4.1 Breaks or holidays in pipe coatings may expose the pipe to possible corrosion, since after a pipe has been installed underground, the surrounding earth will be more or less moisture-bearing and it constitutes an effective electrolyte. Damage to pipe coating is almost unavoidable during transportation and construction. Normal soil potentials as well as applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges, in some cases increasing the apparent size of the holiday. Holidays may also be caused by such potentials. While apparently loosened coating and cathodic holidays may not result in corrosion, this test provides accelerated conditions for loosening to occur and therefore gives a measure of resistance of coatings to this type of action.  
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1.5 This practice only applies to GWT of basic pipe configuration. This includes pipes that are straight, constructed of a single pipe size and schedules, fully accessible at the test location, jointed by girth welds, supported by simple contact supports and free of internal, or external coatings, or both; the pipe may be insulated or painted.  
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SCOPE
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1.1 These test methods cover the apparatus and procedure for detecting holidays in pipeline type coatings.  
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1.1 This practice covers procedures for testing the sources of gas leaking at the rate of 1 × 10 −8 Pa m3/s (1 × 10−9  standard-cm3/s at 0 °C) or greater. These test methods may be conducted on any object that can be evacuated and to the other side of which helium or other tracer gas may be applied. The object must be structurally capable of being evacuated to pressures of 0.1 Pa (approximately 10−3 torr).  
1.2 Three test methods are described;  
1.2.1 Test Method A—For the object under test capable of being evacuated, but having no inherent pumping capability.  
1.2.2 Test Method B—For the object under test with integral pumping capability.  
1.2.3 Test Method C—For the object under test as in Test Method B, in which the vacuum pumps of the object under test replace those normally used in the leak detector (LD).  
1.3 Units—The values stated in either SI or std-cc/sec units are to be regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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