ASTM G20-10(2019)

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: G20 − 10 (Reapproved 2019)
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 Scope Thickness of Pipeline Coatings on Steel (Withdrawn
2013)
1.1 This test method is intended for evaluating the resis-
G17 Test Method for Penetration Resistance of Pipeline
tance of pipe coating materials when exposed to various
Coatings (Blunt Rod)
concentrations of reagents or suspected soil contaminants. The
test serves as a guide to investigators wishing to compare the
3. Summary of Test Method
relative merits of pipe-coating materials in specific environ-
3.1 This test method consists of an immersion-type test in a
ments. The choice of reagents, concentrations, duration of
closed container where coated pipe specimens are in long-term
immersion, temperature of test, and properties to be reported
contactwithboththeliquidandvaporphaseofthetestreagent.
are necessarily arbitrary and should be chosen to reflect
Specimens exposed in this manner are inspected for visible
conditions known to exist along the pipeline right-of-way.
signs of chemical attack. Subsequent tests for cathodic dis-
1.2 The values stated in SI units are to be regarded as the
bonding in accordance with Test Method G8, or penetration
standard. The values given in parentheses are for information
under load in accordance with Test Method G17, may be
only.
applied to determine if the specimens have undergone any loss
1.3 This standard does not purport to address all of the
of mechanical or bonding properties.
safety concerns, if any, associated with its use. It is the
4. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4.1 The data obtained for short-term tests are of interest
mine the applicability of regulatory limitations prior to use.
only in eliminating the most unsuitable materials or for
1.4 This international standard was developed in accor-
indicating a probable order of resistance in any particular
dance with internationally recognized principles on standard-
media.
ization established in the Decision on Principles for the
4.2 Test conditions should take into account the manner and
Development of International Standards, Guides and Recom-
duration of immersion, the reagent, the temperature of the
mendations issued by the World Trade Organization Technical
system, the area exposed above and below the liquid level, and
Barriers to Trade (TBT) Committee.
other performance factors selected for the particular test.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
5.1 Thickness Gage, capable of measuring the coating
D543 Practices for Evaluating the Resistance of Plastics to
thickness in the manner prescribed by Test Method G12.
Chemical Reagents
5.2 Test Container—Atransparent closed container, sized to
D883 Terminology Relating to Plastics
completely encase the pipe specimen and large enough to
G8 Test Methods for Cathodic Disbonding of Pipeline Coat-
provide adequate exposure to both the liquid and vapor states
ings
of reagent.
G12 Test Method for Nondestructive Measurement of Film
NOTE 1—For example, a 2-L (2.0-qt) capacity, Mason-type jar with a
70-mm (2.75-in.) diameter neck has been found suitable for use with 2 in.
pipe and is illustrated in Fig. 1.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
5.2.1 To avoid pressure build-up within the test containers,
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
the threaded cup shall be replaced with a solid-rubber stopper.
Current edition approved Oct. 1, 2019. Published October 2019. Originally
A positive venting device, such as a water seal, shall be used
approved in 1971. Last previous edition approved in 2015 as G20 – 10(2015). DOI:
10.1520/G0020-10R19. when testing with volatile solvents at elevated temperatures.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
G20 − 10 (2019)
6.1.18 Other selected environments.
7. Hazards
7.1 Take safety precautions to avoid personal contact, to
eliminate toxic vapors, and to guard against explosion hazards
in accordance with the hazardous nature of the particular
reagents being used.
8. Test Specimen
8.1 The test specimen shall be prepared with its surface
preparation and coating procedures equivalent to that of coated
pipe. A control specimen shall be retained for comparison.
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.).
Dimensions
A—70 mm (2.75 in.) Jar Opening
8.3 Both ends of the pipe specimens shall be plugged with
B—45 mm (1.75 in.) Holiday Location
C—90 mm (7.00 in.) Length of Pipe Specimen inert stoppers and coated with an epoxy-base or other suitable
coating material.
NOTE 1—Dimensions shown for 2 in. IPS pipe.
8.4 Specimens with Holidays:
FIG. 1 Chemical Immersion Test Schematic of Test Cell
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
5.2.2 A separate container shall be used for each test
caps. It shall be made by drilling a radial hole through the
specimen.
coating so that the angular cone point of the drill will fully
enter t
...