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ASTM G20-88(2002)

(Test Method)

Standard Test Method for Chemical Resistance of Pipeline Coatings

Standard Test Method for Chemical Resistance of Pipeline Coatings

SIGNIFICANCE AND USE
The data obtained for short-term tests are of interest only in eliminating the most unsuitable materials or for indicating a probable order of resistance in any particular media.
Test conditions should take into account the manner and duration of immersion, the reagent, the temperature of the system, the area exposed above and below the liquid level, and other performance factors selected for the particular test.
SCOPE
1.1 This test method is intended for evaluating the resistance of pipe coating materials when exposed to various concentrations of reagents or suspected soil contaminants. The test serves as a guide to investigators wishing to compare the relative merits of pipe-coating materials in specific environments. The choice of reagents, concentrations, duration of immersion, temperature of test, and properties to be reported are necessarily arbitrary and should be chosen to reflect conditions known to exist along the pipeline right-of-way.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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
26-May-1988
ICS
87.040 - Paints and varnishes
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 G20-88(1996)e1 - Standard Test Method for Chemical Resistance of Pipeline Coatings
Effective Date
27-May-1988
Replaced By
ASTM G20-10 - Standard Test Method for Chemical Resistance of Pipeline Coatings
Effective Date
01-Dec-2010
Referred By
ASTM A934/A934M-22 - Standard Specification for Epoxy-Coated Prefabricated Steel Reinforcing Bars
Effective Date
27-May-1988
Referred By
ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
Effective Date
27-May-1988
Referred By
ASTM D3963/D3963M-21 - Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars
Effective Date
27-May-1988
Referred By
ASTM A775/A775M-22 - Standard Specification for Epoxy-Coated Steel Reinforcing Bars
Effective Date
27-May-1988
Referred By
ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
Effective Date
27-May-1988
Referred By
ASTM A950/A950M-11(2023) - Standard Specification for Fusion-Bonded Epoxy-Coated Structural Steel H-Piles and Sheet Piling
Effective Date
27-May-1988
Referred By
ASTM A1055/A1055M-22 - Standard Specification for Zinc and Epoxy Dual-Coated Steel Reinforcing Bars
Effective Date
27-May-1988
Referred By
ASTM A1124/A1124M-23 - Standard Specification for Textured Epoxy-Coated Steel Reinforcing Bars
Effective Date
27-May-1988
Referred By
ASTM A972/A972M-00(2021) - Standard Specification for Fusion Bonded Epoxy-Coated Pipe Piles
Effective Date
27-May-1988

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ASTM G20-88(2002) - Standard Test Method for Chemical Resistance of Pipeline CoatingsASTM G20-88(2002) - Standard Test Method for Chemical Resistance of Pipeline Coatings
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ASTM G20-88(2002) - Standard Test Method for Chemical Resistance of Pipeline Coatings
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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:G20–88(Reapproved2002)
Standard Test Method for
Chemical Resistance of Pipeline Coatings
This standard is issued under the fixed designation G20; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope contactwithboththeliquidandvaporphaseofthetestreagent.
Specimens exposed in this manner are inspected for visible
1.1 This test method is intended for evaluating the resis-
signs of chemical attack. Subsequent tests for cathodic dis-
tance of pipe coating materials when exposed to various
bonding in accordance with Test Method G8, or penetration
concentrations of reagents or suspected soil contaminants. The
under load in accordance with Test Method G17, may be
test serves as a guide to investigators wishing to compare the
applied to determine if the specimens have undergone any loss
relative merits of pipe-coating materials in specific environ-
of mechanical or bonding properties.
ments. The choice of reagents, concentrations, duration of
immersion, temperature of test, and properties to be reported
4. Significance and Use
are necessarily arbitrary and should be chosen to reflect
4.1 The data obtained for short-term tests are of interest
conditions known to exist along the pipeline right-of-way.
only in eliminating the most unsuitable materials or for
1.2 The values stated in SI units are to be regarded as the
indicating a probable order of resistance in any particular
standard. The values given in parentheses are for information
media.
only.
4.2 Test conditions should take into account the manner and
1.3 This standard does not purport to address all of the
duration of immersion, the reagent, the temperature of the
safety concerns, if any, associated with its use. It is the
system, the area exposed above and below the liquid level, and
responsibility of the user of this standard to establish appro-
other performance factors selected for the particular test.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
5.1 Thickness Gage, capable of measuring the coating
2. Referenced Documents
thickness in the manner prescribed by Test Method G12.
2.1 ASTM Standards:
5.2 Test Container—Atransparent closed container, sized to
D543 Practices for Evaluating the Resistance of Plastics to
completely encase the pipe specimen and large enough to
Chemical Reagents
provide adequate exposure to both the liquid and vapor states
D883 Terminology Relating to Plastics
of reagent.
G8 Test Methods for Cathodic Disbonding of Pipeline
Coatings
NOTE 1—For example, a 2-L (2.0-qt) capacity, Mason-type jar with a
G12 Test Method for Nondestructive Measurement of Film 70-mm (2.75-in.) diameter neck has been found suitable for use with 2 in.
pipe and is illustrated in Fig. 1.
Thickness of Pipeline Coatings on Steel
G17 Test Method for Penetration Resistance of Pipeline
5.2.1 To avoid pressure build-up within the test containers,
Coatings (Blunt Rod)
the threaded cup shall be replaced with a solid-rubber stopper.
A positive venting device, such as a water seal, shall be used
3. Summary of Test Method
when testing with volatile solvents at elevated temperatures.
3.1 This test method consists of an immersion-type test in a
5.2.2 A separate container shall be used for each test
closed container where coated pipe specimens are in long-term
specimen.
5.3 Oven or Constant-Temperature Room or Bath—To en-
sure uniformity of test results, the test cells and specimen shall
This test method is under the jurisdiction of ASTM Committee D01 on Paint
be maintained at the test temperature 65°C (9°F) over the
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
duration of the test period.
Current edition approved Dec. 10, 2002. Published December 2002. Originally
5.4 Auxiliary Testing Devices—Supplemental equipment
´1
approved in 1971. Last previous edition approved in 1996 as G20 – 88 (1996) .
used to determine specific mechanical properties of specimens
DOI: 10.1520/G0020-88R02.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or before and after immersion shall conform to the requirements
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
prescribed in the applicable ASTM test method.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
G20–88 (2002)
8.2 In order to utilize the test container specified in 4.2, the
pipe specimen, with end caps, shall be restricted to a maximum
overall length of 180 mm (7.0 in.) and a diameter of 65 mm
(2.5 in.).
8.3 Both ends of the pipe specimens shall be plugged with
inert stoppers and coated with an epoxy-base coating material.
8.4 Specimens with Holidays:
8.4.1 A holiday shall be made in the surface of the coated
pipe specimen at a point 25 % of the distance between the end
caps. It shall be made by drilling a radial hole through the
coating so that the angular cone point of the drill will fully
enter the steel where the cylindrical portion of the drill meets
the steel surface. The drill diameter shall not be less than three
times the coating thickness, but it shall never be smaller than 6
mm (0.25 in.) in diameter. The steel wall of the pipe shall not
Dimensions be perforated.
A—70 mm (2.75 in.) Jar Opening
8.4.2 A second identical holiday shall be drilled into the
B—45 mm (1.75 in.) Holiday Location
coating surface at a point 25 % of the distance between the end
C—90 mm (7.00 in.) Length of Pipe Specimen
c
...

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1.1 This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.  
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