ASTM G20-88(1996)e1

Standard Test Method for Chemical Resistance of Pipeline Coatings

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 This test method may involve hazardous operations and equipment. This test method does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this test method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-1996
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.48 - Durability of Pipeline Coating and Linings

Relations

• Replaced By: ASTM G20-88(2002) - Standard Test Method for Chemical Resistance of Pipeline Coatings
• Effective Date: 27-May-1988
• Referred By: ASTM A1055/A1055M-22 - Standard Specification for Zinc and Epoxy Dual-Coated Steel Reinforcing Bars
• Effective Date: 10-May-1996
• Referred By: ASTM A934/A934M-22 - Standard Specification for Epoxy-Coated Prefabricated Steel Reinforcing Bars
• Effective Date: 10-May-1996
• Referred By: ASTM A1124/A1124M-23 - Standard Specification for Textured Epoxy-Coated Steel Reinforcing Bars
• Effective Date: 10-May-1996
• Referred By: ASTM A775/A775M-22 - Standard Specification for Epoxy-Coated Steel Reinforcing Bars
• Effective Date: 10-May-1996
• Referred By: ASTM A950/A950M-11(2023) - Standard Specification for Fusion-Bonded Epoxy-Coated Structural Steel H-Piles and Sheet Piling
• Effective Date: 10-May-1996
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 10-May-1996
• Referred By: ASTM A972/A972M-00(2021) - Standard Specification for Fusion Bonded Epoxy-Coated Pipe Piles
• Effective Date: 10-May-1996
• Referred By: ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
• Effective Date: 10-May-1996
• Referred By: ASTM D3963/D3963M-21 - Standard Specification for Fabrication and Jobsite Handling of Epoxy-Coated Steel Reinforcing Bars
• Effective Date: 10-May-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: G 20 – 88 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Chemical Resistance of Pipeline Coatings
This standard is issued under the fixed designation G 20; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords and unit of measurement statement were added editorially in July 1996.
1. Scope Specimens exposed in this manner are inspected for visible
signs of chemical attack. Subsequent tests for cathodic dis-
1.1 This test method is intended for evaluating the resis-
bonding in accordance with Test Method G 8, or penetration
tance of pipe coating materials when exposed to various
under load in accordance with Test Method G 17, may be
concentrations of reagents or suspected soil contaminants. The
applied to determine if the specimens have undergone any loss
test serves as a guide to investigators wishing to compare the
of mechanical or bonding properties.
relative merits of pipe-coating materials in specific environ-
ments. The choice of reagents, concentrations, duration of
4. Significance and Use
immersion, temperature of test, and properties to be reported
4.1 The data obtained for short-term tests are of interest
are necessarily arbitrary and should be chosen to reflect
only in eliminating the most unsuitable materials or for
conditions known to exist along the pipeline right-of-way.
indicating a probable order of resistance in any particular
1.2 The values stated in SI units are to be regarded as the
media.
standard. The values given in parentheses are for information
4.2 Test conditions should take into account the manner and
only.
duration of immersion, the reagent, the temperature of the
1.3 This standard does not purport to address all of the
system, the area exposed above and below the liquid level, and
safety concerns, if any, associated with its use. It is the
other performance factors selected for the particular test.
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 Thickness Gage, capable of measuring the coating
thickness in the manner prescribed by Test Method G 12.
2. Referenced Documents
5.2 Test Container—A transparent closed container, sized to
2.1 ASTM Standards:
completely encase the pipe specimen and large enough to
D 543 Test Method for Resistance of Plastics to Chemical
provide adequate exposure to both the liquid and vapor states
Reagents
2 of reagent.
D 883 Terminology Relating to Plastics
G 8 Test Methods for Cathodic Disbonding of Pipeline
NOTE 1—For example, a 2-L (2.0-qt) capacity, Mason-type jar with a
Coatings 70-mm (2.75-in.) diameter neck has been found suitable for use with 2 in.
pipe and is illustrated in Fig. 1.
G 12 Test Method for Nondestructive Measurement of Film
Thickness of Pipeline Coatings on Steel
5.2.1 To avoid pressure build-up within the test containers,
G 17 Test Method for Penetration Resistance of Pipeline
the threaded cup shall be replaced with a solid-rubber stopper.
Coatings (Blunt Rod)
A positive venting device, such as a water seal, shall be used
when testing with volatile solvents at elevated temperatures.
3. Summary of Test Method
5.2.2 A separate container shall be used for each test
3.1 This test method consists of an immersion-type test in a
specimen.
closed container where coated pipe specimens are in long-term
5.3 Oven or Constant-Temperature Room or Bath—To en-
contact with both the liquid and vapor phase of the test reagent.
sure uniformity of test results, the test cells and specimen shall
be maintained at the test temperature 65°C (9°F) over the
duration of the test period.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
5.4 Auxiliary Testing Devices—Supplemental equipment
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.48 on Durability of Pipeline Coatings and Linings. used to determine specific mechanical properties of specimens
Current edition approved May 27, 1988. Published July 1988. Originally
before and after immersion shall conform to the requirements
published as G 20 – 71 T. Last previous edition G 20 – 83.
prescribed in the applicable ASTM test method.
Annual Book of ASTM Standards, Vol 08.01.
Annual Book of ASTM Standards, Vol 06.02.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
G20
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
be perforated.
Dimensions
A—70 mm (2.75 in.) Jar Opening
8.4.2 A second identical holid
...