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ASTM G70-81(1998)

(Test Method)

Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)

Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)

SCOPE
1.1 This method covers testing the relative resistance of pipeline coatings to cracking and spalling from deformation of the pipe by observing the effects of diametral compression of ring samples. The method is limited to thin film coatings having an elongation not exceeding 5.0%.  
1.2 The values stated in SI units are to be regarded as the standard.  
1.3 This standard does not purport to address all of the safety problems, 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.
WITHDRAWN RATIONALE
This test method covers testing the relative resistance of pipeline coatings to cracking and spalling from deformation of the pipe by observing the effects of diametral compression of ring samples. The method is limited to thin film coatings having an elongation not exceeding 5.0 %.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

Status
Historical
Publication Date
09-Jul-1998
Withdrawal Date
20-Mar-2007
ICS
25.220.20 - Surface treatment
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

Replaced By
ASTM G70-07 - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)
Effective Date
01-Jul-2007

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ASTM G70-81(1998) - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)ASTM G70-81(1998) - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)
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ASTM G70-81(1998) - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)
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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:G70–81(Reapproved1998)
Standard Test Method for
Ring Bendability of Pipeline Coatings (Squeeze Test)
ThisstandardisissuedunderthefixeddesignationG70;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope dimensions by subtracting the dial indicator or micrometer
reading from the initial pipe diameter.
1.1 This method covers testing the relative resistance of
pipeline coatings to cracking and spalling from deformation of
4. Significance and Use
the pipe by observing the effects of diametral compression of
4.1 The method will provide information on the ability of
ring samples. The method is limited to thin film coatings
pipeline coatings to resist cracking, spalling, or other mechani-
having an elongation not exceeding 5.0%.
cal damage as a result of bending. If the test is applied to
1.2 The values stated in SI units are to be regarded as the
coated pipe samples from commercial production, the results
standard. The values given in parentheses are for information
canbeusedintheselectionofsimilarmaterialsforservice.The
only.
testhasapplicationasaqualitycontrolmethodwhenvariations
1.3 This standard does not purport to address all of the
in coating application or material formulation may affect
safety concerns, if any, associated with its use. It is the
bending performance.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Apparatus
bility of regulatory limitations prior to use.
5.1 Compression Apparatus—An arbor press, universal test
machine, or other device that can apply sufficient force at a
2. Referenced Documents
controlled rate of movement.
2.1 ASTM Standards:
5.2 Film Thickness Gage,asdescribedinTestMethodG12.
G12 TestMethodforNondestructiveMeasurementofFilm
5.3 Holiday Detector—A high- or low-voltage d-c holiday
Thickness of Pipeline Coatings on Steel
detector as specified in Test Methods G62 shall be used to
G62 Test Methods for Holiday Detection in Pipeline Coat-
locate breaks in the coating film. Low-voltage holiday detec-
ings
tors shall be used on coatings 0.51 mm (#20 mils) thick and
3. Summary of Test Method high-voltage holiday detectors shall be used on thicker coat-
ings.
3.1 The method consists of compressing coated pipe ring
samples in a hydraulic arbor press, universal test machine, or
6. Test Specimens
other suitable device. The ring sample is compressed to an
6.1 The test specimens shall be coated ring samples 506 5
approximateovalshapewhereintheminordiameteroftheoval
mm (2 6 0.20 in.) in length.
isproducedbyabendingforcethatelongatesthecoatingatthe
6.2 Five samples shall be cut from the same piece of coated
metal interface. The coating elongation or stretch as produced
pipe by hand saw, power saw, or lathe with care not to damage
inthetestbycompressingtheringtoagageddimensioncanbe
the coating in the holding device. All edges shall be visually
calculated to produce the same coating elongation or stretch as
deburred. More samples may be required depending on the
would occur in actual bending of the pipe to a given radius.
testing application.
Coating failure in the form of cracking or loss of adhesion is
6.3 Samples shall have areas of coating removed in accor-
detected by electrical test for holidays while the test is in
dance with Fig. 1.
process.
6.4 The samples shall be free of obvious coating flaws or
3.2 Compressionofcoatedringsamplesiscontrolledbyuse
defects.
of a dial indicator, micrometer, or other suitable distance-
measuring device. Dimensions are then corrected to outside
7. Conditioning
7.1 Where compression testing at room temperature is
required, the specimen shall be exposed to these conditions for
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications,and is the direct responsibility of
a sufficient time to ensure thermal equilibrium in the pipe and
Subcommittee D01.48on Deterioration of Pipeline Coatings and Linings.
coating. A temperature in the range from 20 to 25°C (68 to
Current edition approved Oct. 30, 1981. Published December 1981.
Annual Book of ASTM Standards, Vol 06.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
G70
thepointofcrackingofthecoatingfilm.Notethenumber,size,
and type of cracks present. Examine the pipe specimen for any
loss of coating bond caused by the bending operation.
NOTE 1—The possibility of some coatings developing stress-induced
cracks in the period following the bending operation should not be
overlooked.Ifthisisaconsideration,thebentspecimenshouldberetained
for future inspection.
8.6 If a micrometer is used, measure the distance of com-
pression of the specimen.
8.7 After finding the distance of compression, subtract this
figure from the initial pipe diameter and determine the percent
bend by calculation as shown in the Annex A1.
9. Report
9.1 The initial test report shall include the following (see
Fig. 2):
9.1.1 Complete identification of the coated pipe tested,
including: name and type of coating; average coating thick-
ness;minimumcoatingthickness;maximumcoatingthickness;
manufacturer’s lot number; date of manufacture; nominal pipe
diameter.
9.1.2 Rate of compression.
9.1.3 Temperature of the pipe specimen as tested.
9.1.4 Percent bend and corresponding distance of compres-
sion at which cracking first occurred.
9.1.5 Description of the type of cracking that is visible, or
FIG. 1 Specimen
indicated, or both, by the holiday detector.
9.1.6 Extent of any loss in pipe-to-coating bond.
77°F) shall be considered room temperature.Arelative humid-
9.1.7 Number of specimens tested.
ity of 50 6 5% shall be considered standard.
7.2 Tests at other temperatures shall be made in such a
9.1.8 Any peculiar characteristics of the specimen noted
manner as to ensure that thermal equilibrium is maintained
during the test or after immediate removal from the test
between the specimen and its conditioning environment.
apparatus.
9.1.9 Post-bend retention time in days.
8. Procedure
8.1 Measuretheoutsidediameterandwallthicknessofeach
10. Precision
specimen using a suitable measuring instrument.
8.2 Measure the applied coating thickness of each specimen 10.1 Precision data are limited to adjacent specimens taken
in accordance with Test Method G12. from the production-coated pipe assuming that the production
8.3 Place specimen between the compression surfaces and
processwasuniformwithrespecttopipesurfaceconditionand
apply sufficient compressive force to barely hold the sample.
coating material. Specimens that were not adjacent in the
The direction of compression shall be as shown in Fig. 1.
as-produced condition or were taken
...

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SIGNIFICANCE AND USE
5.1 Subject to the limitations listed above, the procedure can be used as a research tool to optimize spray equipment and paint formulations as well as to study the relative effect on transfer efficiency of changing operating variables, spray application equipment, and types of coatings.
SCOPE
1.1 This test method covers the evaluation and comparison of the transfer efficiency of spray-applied coatings under controlled laboratory conditions.  
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1.3.1 This laboratory procedure only indicates the direction of the effect of spray variables on transfer efficiency. The magnitude of the effect is determined only by specific plant experience.  
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1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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