Standard Test Method for Water Penetration into Pipeline Coatings

SIGNIFICANCE AND USE
4.1 The deterioration of an insulating coating film is intimately related to its moisture content. The water penetration test provides a means for monitoring the passage of moisture through a coating material by means of changes in its dielectric constant. When expressed in relation to time, the test data will reflect a rate of deterioration which is a characteristic of the coating material and will bear a relation to its expected useful life as an insulating coating. The test for water penetration will also provide information that is useful in establishing the optimum coating thickness for a given material.
SCOPE
1.1 This method covers the determination of the apparent rate of depth of water penetration into insulating coatings applied to pipe.  
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
31-May-2013
Current Stage
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ASTM G9-07(2013)e1 - Standard Test Method for Water Penetration into 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation: G9 − 07 (Reapproved 2013)
Standard Test Method for
Water Penetration into Pipeline Coatings
This standard is issued under the fixed designation G9; 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.
ε NOTE—Editorial corrections were made throughout in June 2013.
1. Scope throughacoatingmaterialbymeansofchangesinitsdielectric
constant. When expressed in relation to time, the test data will
1.1 This method covers the determination of the apparent
reflect a rate of deterioration which is a characteristic of the
rate of depth of water penetration into insulating coatings
coating material and will bear a relation to its expected useful
applied to pipe.
life as an insulating coating. The test for water penetration will
1.2 The values stated in SI units are to be regarded as the
also provide information that is useful in establishing the
standard. The values given in parentheses are for information
optimum coating thickness for a given material.
only.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Immersion Cell—Any suitable nonmetallic vessel to
responsibility of the user of this standard to establish appro-
contain the test specimens. Dimensions of the vessel shall
priate safety and health practices and determine the applica-
permit the following requirements:
bility of regulatory limitations prior to use.
5.1.1 Test specimens shall be suspended vertically with at
least 25 mm (1.0 in.) clearance from the sides and bottom.
2. Referenced Documents
5.1.2 Test specimens shall be separated by not less than 25
2.1 ASTM Standards:
to 40 mm (1 to 1.5 in.) and a vertically suspended anode shall
G12 Test Method for Nondestructive Measurement of Film
beplacedatanequaldistancefromeachspecimennotlessthan
Thickness of Pipeline Coatings on Steel (Withdrawn
the separation of distance.
2013)
5.1.3 The test vessel shall be deep enough to allow for
immersion of the samples in the electrolyte to the level
3. Summary of Test Method
specified in 8.1.
3.1 The method consists of an immersion-type test where
NOTE 1—Commercially available, glass battery jars in 2-L (0.55-gal)
pipe specimens are suspended in an aqueous electrolyte for the
and 10-L (2.7-gal) sizes can be conveniently used with 19-mm (0.75-in.)
duration of the test period. Electrical measurements of coating
and 51-mm (2.0-in. nominal) diameter specimens, respectively.
capacitance and dissipation factor are used to follow the water
5.1.4 A suitable sample support plate fabricated from a
absorption rate of the test materials.
material having a low dielectric constant shall be used to
4. Significance and Use suspend the samples and anode above the immersion cell. The
support plate shall contain an access hole for the reference
4.1 The deterioration of an insulating coating film is inti-
electrode. A typical test cell is illustrated in Fig. 1.
mately related to its moisture content. The water penetration
test provides a means for monitoring the passage of moisture
5.2 Electrolyte, consisting of tap water with the addition of
1 weight % of each of the following technical-grade anhydrous
salts: sodium chloride, sodium sulfate, and sodium carbonate.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
NOTE 2—Add 10 g of each for each litre (0.26 gal) of water.
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
5.2.1 The electrolyte in the immersion cell shall be main-
CurrenteditionapprovedJune1,2013.PublishedJuly2013.Originallyapproved
in 1969. Last previous edition approved in 2007 as G9 – 07. DOI: 10.1520/G0009-
tained at the proper level by regular additions of tap water.The
07R13E01.
electrolyte shall not be reused after completion of the test.
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
5.3 Voltage Source—Adirect current power supply, capable
Standards volume information, refer to the standard’s Document Summary page on
of supplying low ripple voltage shall be used to maintain a
the ASTM website.
potential difference of 6.0 6 0.1 V dc between each of the test
The last approved version of this historical standard is referenced on
www.astm.org. specimens and a common electrode.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
G9 − 07 (2013)
NOTE 3—A shield for the test cell can conveniently be fabricated from
most commercially-available tin or aluminum foils of approximately
0.0382-mm (0.0015-in.) thickness and formed around the container.
5.7 Thickness Gage—Measurements of coating thickness
will be required for this test. Any instrument suitable for use
with Test Method G12 can be used.
5.8 Anode, fabricated from 4.76-mm (0.1875-in.) diameter
AISI Type 303 stainless-steel rod, and shall be 178 mm (7.00
in.) long, with the upper 50 mm (2.00 in.) threaded to accept a
locking nut.
6. Test Specimen
6.1 The test specimen shall be a representative piece of
production-coated pipe and shall be free of obvious coating
flaws or defects (see Fig. 3). Any suitable diameter and
specimen length can be used. Physical limitations of the
immersion cells suggested in 5.1.3, Note 1, make it necessary
to restrict the overall sample length to approximately 300 mm
(12.0 in.) for both the 19-mm (0.75-in. nominal) and 51-mm
(2.0-in. nominal) diameter coated pipe specimens.
6.2 The upper and lower ends of the test specimen shall be
plugged and sealed with nonconductive caps of sufficient bulk
to minimize effectively capacitive end effects in the measuring
circuit. For this purpose, an end-cap thickness of from 13 mm
(0.5 in.) to 19 mm (0.75 in.) shall be maintained.
6.2.1 The end-cap material shall have a dielectric constant
in the range from 2 to 6, bond well to the coating surface, and
FIG. 1 Typical Test Cell exhibit a low water-absorption rate. Several commercially
available poly(vinyl chloride)-paraffin compounds, are well
suited for this purpose.They have a melting point in the 150 to
200°C (300 to 390°F) range, can be poured into molds around
5.4 Connectors—Wiring connections from the anode to the
the pipe sample, and appear as resilient, durable solids at room
specimen shall be of No. 18 AWG insulated copper. Attach-
temperature.
ment to the anode shall be sealed and kept above the level of
the electrolyte.Attachment to the specimen shall be made by a NOTE 4—Using these materials, the end-caps can be applied to the
required thickness by repeated dipping of the sample ends into a
method that will allow disconnection from the anode when the
molten-wax bath, or through the use of light-weight, disposable molds of
measuring bridge is in use. A convenient means for accom-
aluminumfoilorpaperformedaroundthepipesampletoallowthecasting
plishing this is through the use of insulated pin-type jacks.
of the caps directly to the surface of the coated pipe sample.
5.5 Capacitance Bridge—Measurements of equivalent
6.3 The end of the specimen which will protrude above the
specimen capacitance and coating dissipation factor shall be
immersion line shall be provided with a suitable means of
made with a low-voltage a-c, resistive-ratio-arm type measur-
support and a separate wire connection for electrical purposes.
ing bridge having the following characteristics:
The protruding end of the sample shall be waterproofed with a
5.5.1 Oscillator frequency, 1 kHz 62%,
thin coating of e
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