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ASTM G55-07

(Test Method)

Standard Test Method for Evaluating Pipeline Coating Patch Materials

Standard Test Method for Evaluating Pipeline Coating Patch Materials

SIGNIFICANCE AND USE
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.
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.
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Jun-2007
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

Relations

Replaces
ASTM G55-88(1998) - Standard Test Method for Evaluating Pipeline Coating Patch Materials (Withdrawn 2007)
Effective Date
01-Jul-2007
Replaced By
ASTM G55-07(2013) - Standard Test Method for Evaluating Pipeline Coating Patch Materials
Effective Date
01-Jun-2013

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ASTM G55-07 - Standard Test Method for Evaluating Pipeline Coating Patch Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G55 − 07
StandardTest 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 mayberequired.Theeffectivenessofapatchmaterialdepends
upon its adhesion to the original pipeline coating to effect
1.1 This test method provides an accelerated means of
sealing.
determining the relative sealing abilities of pipeline patching
materials that are used to seal holidays in pipeline coatings on 3.2 The results of this accelerated test have been found to
steel pipe. This test method is intended for utilization of yield comparative data useful for the selection of patching
specimens of pipeline coatings on small-diameter pipe, for materials. The user is cautioned against the use of this method
representing coatings used for buried or submerged service, for absolute material properties characterization.
and where the purpose of the coating is to provide an electrical
3.3 This procedure provides an accelerated method by
barrier between the steel pipe and its environment.
exposing the patch to a severe radius of curvature on small-
1.2 This test method is not intended for evaluating patch diameterpipe.Thespecimenisalsoexposedtoastressvoltage
materials that are overlapped upon themselves. in the presence of a highly conductive electrolyte.
1.3 The values stated in SI units are to be regarded as the
4. Apparatus
standard. The values given in parentheses are for information
4.1 Test Vessel—A cylindrical glass battery jar (or
only.
equivalent), approximately 300 mm (12 in.) in diameter and
1.4 This standard does not purport to address all of the
300mminheight.Onemagnesiumanodeshallbecontainedin
safety concerns, if any, associated with its use. It is the
each battery jar, with a maximum of eight pipe specimens, and
responsibility of the user of this standard to establish appro-
witheachspecimenmeasuringabout25mm(1in.)indiameter
priate safety and health practices and determine the applica-
by approximately 300 mm in length of coated pipe. (See 4.3
bility of regulatory limitations prior to use.
and Fig. 1 and Fig. 2.)
2. Summary of Test Method
4.2 Suspension—The suspension ring for supporting the
2.1 Patched pipeline coating specimens are suspended in an pipe specimens shall be an electrically nonconductive circular
disk, measuring approximately 300 mm (12 in.) in diameter
aqueous, alkaline, low-resistivity electrolyte. The specimens
3
areindividuallyconnectedtoamagnesiumanodeorrectifierat and approximately 5 mm ( ⁄16 in.) in thickness. (See 6.4.) Drill
1
a 15-mm ( ⁄2-in.) diameter hole through the center of the ring
apointexternaltotheelectrolyte.Thecoated,patchedpipeline
specimens are sealed at the base and at all other areas except for external extension of the anode lead wire. Drill eight
3
suspension holes, about 45 mm (1 ⁄4 in.) in diameter, through
the patch boundaries, such that the only paths for current flow
areattheboundariesofthepatches.Currentflowineachpatch thesuspensionringforthepipespecimens;theseholesshallbe
1
centered 110 mm (4 ⁄2 in.) from the center of the suspension
area is averaged from monthly readings taken for one year.
ring and evenly spaced around the ring at 45° increments as
3. Significance and Use
measured from the center of the suspension ring.
3.1 Holidays in pipeline coatings may be repaired by
4.3 Potential—A high-purity magnesium anode shall be
circumferential wrapping with a suitable pipe wrap tape.
used, weighing approximately 2.3 kg (5 lb), and having an
However,thistechniqueisnotalwayspracticableandpatching
open-circuit potential of approximately 1.7 d-c V relative to a
copper-copper sulfate electrode, and complete with a factory-
1
sealed lead wire. The magnesium anode may be replaced by a
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplicationsand is the direct responsibility of
controlledd-cvoltagefromarectifier,andthenmaintainingthe
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
potential between the specimen having the least current flow
CurrenteditionapprovedJuly1,2007.PublishedJuly2007.Originallyapproved
and a copper-copper sulfate reference cell (with the cell being
in 1977. Last previous edition approved in 1998 as G55–88(1998) which was
withdrawn March 2007 and reinstated in July 2007. DOI: 10.1520/G0055-07. properly immersed in the electrolyte) at 1.50 6 0.05 d-c V.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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5.1 Method A—Low voltage holiday detection is used to locate holidays and pinholes in thin-film coatings (up to 0.508 mm (20 mils) using a sponge wetted with tap water (and a wetting agent for coatings thicker than 10 mils). The water carries the current from the electrode through the holiday to the conductive substrate. The detector is grounded to the coated substrate. When the detector senses this flow of current it alarms.  
5.2 Method B—High voltage holiday detection is used to locate holidays and pinholes in thick-film coatings (greater than 20 mils), but can be used on coatings as low as 10 mils thick. A test voltage is selected and set. A charged Electrode is placed in contact with the coating, and the Detector is grounded to the coated substrate. When Electrical Breakdown occurs, electric current flows between the Detector’s electrode and the conductive substrate and emits an audible alarm.  
5.3 This standard does not apply to holiday detection of tape wraps used to protect pipe or coatings containing conductive raw materials such as conductive pigments and extenders.  
5.4 The thickness of a coating applied to ductile iron pipe, fittings, or other iron castings may vary substantially due to the inherent roughness of the substrate. For these applications, consult the coating manufacturer for their recommended test voltage setting when using Method B. The coating manufacturer’s recommended test voltage setting may be subject to approval by the owner.
Note 1: Use of voltage settings lower than those listed in this standard may increase the likelihood of non-detection.
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1.1 These test methods cover the apparatus and procedures for detecting pinholes and holidays in coatings used to protect pipelines.  
1.2 Method A is designed to detect pinholes and holidays in thin-film coatings from 0.025 mm to 0.254 mm (1 mils to 10 mils) in thickness using ordinary tap water and an applied voltage of less than 100 V d-c. It is effective on films up to 0.508 mm (20 mils) thickness if a wetting agent is used with the water.  
1.3 Method B is designed to detect pinholes and holidays in thick-film coatings >0.508 mm (20 mils) This method can be used on any thickness of pipeline coating and utilizes applied voltages between 3.4 and 35 kV d-c.  
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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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1.1 This test method covers accelerated procedures for simultaneously determining comparative characteristics of coating systems applied to steep pipe exterior for the purpose of preventing or mitigating corrosion that may occur in underground service where the pipe will be in contact with natural soils and will receive cathodic protection. They are intended for use with samples of coated pipe taken from commercial production and are applicable to such samples when the coating is characterized by function as an electrical barrier.  
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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.  
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SCOPE
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4.1 This practice is for use by designers and specifiers, regulatory agencies, owners, and inspection organizations who are involved in the rehabilitation of pipes through the use of a resin-impregnated tube installed within a damaged existing host pipe. As for any practice, modifications may be required for specific job conditions.
SCOPE
1.1 This practice covers requirements and test methods for the sectional cured-in-place lining (SCIPL) repair of a pipe line (4 in. through 60 in. (10.2 cm through 152 cm)) by the installation of a continuous resin-impregnated-textile tube into an existing host pipe by means of air or water inversion and inflation. The tube is pressed against the host pipe by air or water pressure and held in place until the thermoset resins have cured. When cured, the sectional liner shall extend over a predetermined length of the host pipe as a continuous, one piece, tight fitting, corrosion resistant, and verifiable non-leaking cured-in-place pipe.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 There is no similar or equivalent ISO 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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  • Standard
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    English language
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