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ASTM G70-07

(Test Method)

Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)

Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)

SIGNIFICANCE AND USE
The method will provide information on the ability of pipeline coatings to resist cracking, spalling, or other mechanical damage as a result of bending. If the test is applied to coated pipe samples from commercial production, the results can be used in the selection of similar materials for service. The test has application as a quality control method when variations in coating application or material formulation may affect bending performance.
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. 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.
WITHDRAWN RATIONALE
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 %.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in June 2013. This standard is being withdrawn without replacement because: (1) limited/no use within industry, (2) no known labs to do the testing, and (3) other bendability tests exist and are used more commonly within the industry.

General Information

Status
Withdrawn
Publication Date
30-Jun-2007
Withdrawal Date
20-Jun-2013
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

Replaces
ASTM G70-81(1998) - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2007)
Effective Date
01-Jul-2007

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ASTM G70-07 - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)ASTM G70-07 - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)
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ASTM G70-07 - Standard Test Method for Ring Bendability of Pipeline Coatings (Squeeze Test) (Withdrawn 2013)
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Standards Content (Sample)

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 − 07
StandardTest Method for
1
Ring Bendability of Pipeline Coatings (Squeeze Test)
ThisstandardisissuedunderthefixeddesignationG70;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Coating failure in the form of cracking or loss of adhesion is
detected by electrical test for holidays while the test is in
1.1 This method covers testing the relative resistance of
process.
pipeline coatings to cracking and spalling from deformation of
the pipe by observing the effects of diametral compression of 3.2 Compressionofcoatedringsamplesiscontrolledbyuse
ring samples. The method is limited to thin film coatings
of a dial indicator, micrometer, or other suitable distance-
having an elongation not exceeding 5.0%. measuring device. Dimensions are then corrected to outside
dimensions by subtracting the dial indicator or micrometer
1.2 The values stated in SI units are to be regarded as the
reading from the initial pipe diameter.
standard. The values given in parentheses are for information
only.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 The method will provide information on the ability of
safety concerns, if any, associated with its use. It is the
pipelinecoatingstoresistcracking,spalling,orothermechani-
responsibility of the user of this standard to establish appro-
cal damage as a result of bending. If the test is applied to
priate safety and health practices and determine the applica-
coated pipe samples from commercial production, the results
bility of regulatory limitations prior to use.
canbeusedintheselectionofsimilarmaterialsforservice.The
testhasapplicationasaqualitycontrolmethodwhenvariations
2. Referenced Documents
in coating application or material formulation may affect
2
2.1 ASTM Standards:
bending performance.
G12Test Method for Nondestructive Measurement of Film
Thickness of Pipeline Coatings on Steel
5. Apparatus
G62Test Methods for Holiday Detection in Pipeline Coat-
5.1 Compression Apparatus—An arbor press, universal test
ings
machine, or other device that can apply sufficient force at a
controlled rate of movement.
3. Summary of Test Method
5.2 Film Thickness Gage, as described inTest Method G12.
3.1 The method consists of compressing coated pipe ring
samples in a hydraulic arbor press, universal test machine, or
5.3 Holiday Detector—A high- or low-voltage d-c holiday
other suitable device. The ring sample is compressed to an
detector as specified in Test Methods G62 shall be used to
approximateovalshapewhereintheminordiameteroftheoval
locate breaks in the coating film. Low-voltage holiday detec-
isproducedbyabendingforcethatelongatesthecoatingatthe
tors shall be used on coatings 0.51 mm (≤20 mils) thick and
metal interface. The coating elongation or stretch as produced
high-voltage holiday detectors shall be used on thicker coat-
inthetestbycompressingtheringtoagageddimensioncanbe
ings.
calculated to produce the same coating elongation or stretch as
would occur in actual bending of the pipe to a given radius.
6. Test Specimens
6.1 The test specimens shall be coated ring samples 50 6 5
mm (2 6 0.20 in.) in length.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
6.2 Five samples shall be cut from the same piece of coated
and Related Coatings, Materials, andApplicationsand is the direct responsibility of
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
pipe by hand saw, power saw, or lathe with care not to damage
CurrenteditionapprovedJuly1,2007.PublishedJuly2007.Originallyapproved
the coating in the holding device. All edges shall be visually
in 1981. Last previous edition approved in 1998 as G70-81(1998) which was
deburred. More samples may be required depending on the
withdrawn March 2007 and reinstated in July 2007. DOI: 10.1520/G0070-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or testing application.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3 Samples shall have areas of coating removed in accor-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. dance with Fig. 1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G70−07
Specimen Diameter, mm Testing Speed, mm/min
50 to 200 2 to 20
200 to 400 20 to 40
400 to 600 40 to 60
>600 60 to 100
The rate of movement of the compression surfaces can be
determined by any suitable method such as a dial indicator,
micrometer, caliper, and a stop
...

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SIGNIFICANCE AND USE
4.1 A coating is applied to a metallic substrate to prevent corrosion, reduce abrasion or reduce product contamination, or all three. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently very minute and not readily visible. This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems.  
4.2 Electrical testing to determine the presence and number of discontinuities in a coating film is performed on a nonconductive coating applied to an electrically conductive surface. The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on coating film thickness, design, and service conditions.  
4.3 The low voltage wet sponge test equipment is generally used for determining the existence of discontinuities in coating films having a total thickness of 0.5 mm (20 mil) or less. High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than 0.5 mm (20 mil).  
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4.5 To prevent damage to a coating film when using high voltage test instrumentation, total film thickness and dielectric strength in a coating system shall be considered in selecting the appropriate voltage for detection of discontinuities. Atmospheric conditions shall also be considered since the voltage required for the spark to gap a given distance in air varies with the conductivity of the air at the time the test is conducted. Suggested starting voltages are provided in Table 1.  
Note 1: Alternative methods for selecting a suitable test voltage are given in T...
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