ASTM D5820-95(2011)
(Practice)Standard Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes
Standard Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes
SIGNIFICANCE AND USE
The increased use of geomembranes as barrier materials to restrict liquid or gas movement, and the common use of dual track seams in joining these sheets, has created a need for a standard nondestructive test by which the quality of the seams can be assessed for continuity and water tightness. The test is not intended to provide any indication of the physical strength of the seam.
This practice recommends an air pressure test within the channel created between dual seamed tracks whereby the presence of unbonded sections or channels, voids, nonhomogenities, discontinuities, foreign objects, and the like, in the seamed region can be identified.
This technique is intended for use on seams between geomembrane sheets formulated from the appropriate polymers and compounding ingredients to form a plastic or elastomer sheet material that meets all specified requirements for the end use of the product.
SCOPE
1.1 The practice covers a nondestructive evaluation of the continuity of parallel geomembrane seams separated by an unwelded air channel. The unwelded air channel between the two distinct seamed regions is sealed regions is sealed and inflated with air to a predetermined pressure. Long lengths of seam can be evaluated by this practice more quickly than by other common nondestructive tests.
1.2 This practice should not be used as a substitute for destructive testing. Used in conjunction with destructive testing, this method can provide additional information regarding the seams undergoing testing.
1.3 This practice supercedes Practice D4437 for geomembrane seams that include an air channel. Practice D4437 may continue to be used for other types of seams. The user is referred to the referenced standards, or to EPA/530/SW-91/051 for additional information regarding geomembrane seaming techniques and construction quality assurance.
1.4 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.
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Standards Content (Sample)
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Designation: D5820 − 95 (Reapproved 2011)
Standard Practice for
Pressurized Air Channel Evaluation of Dual Seamed
Geomembranes
This standard is issued under the fixed designation D5820; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Standard:
EPA/530/SW-91/051 Technical Guidance Document: In-
1.1 The practice covers a nondestructive evaluation of the
spection Techniques for the Fabrication of Geomembrane
continuity of parallel geomembrane seams separated by an
Field Seams
unwelded air channel. The unwelded air channel between the
two distinct seamed regions is sealed regions is sealed and
3. Terminology
inflated with air to a predetermined pressure. Long lengths of
3.1 Definitions:
seam can be evaluated by this practice more quickly than by
other common nondestructive tests. 3.1.1 dual seam, n—a geomembrane seam with two parallel
welded zones separated by an unwelded air space.
1.2 This practice should not be used as a substitute for
3.1.2 Discussion—The dual seam itself can be made by a
destructive testing. Used in conjunction with destructive
number of methods, the most common being the hot wedge
testing, this method can provide additional information regard-
technique. Other possible methods include hot air and ultra-
ing the seams undergoing testing.
sonic bonding techniques.
1.3 This practice supercedes Practice D4437 for geomem-
3.1.3 geomembrane, n—anessentiallyimpermeablegeosyn-
brane seams that include an air channel. Practice D4437 may
thetic composed of one or more synthetic sheets.
continue to be used for other types of seams. The user is
referred to the referenced standards, or to EPA/530/SW-91/051 3.1.4 Discussion—In geotechnical engineering, imperme-
for additional information regarding geomembrane seaming able essentially means that no measurable liquid flows through
techniques and construction quality assurance. a geosynthetic when tested in accordance with Test Methods
D4491.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3.1.5 seam, n—a permanent joining of two or more materi-
responsibility of the user of this standard to establish appro-
als.
priate safety and health practices and determine the applica-
3.2 For definitions of other terms, see Terminology D4439.
bility of regulatory limitations prior to use.
4. Summary of Practice
2. Referenced Documents
4.1 This practice utilizes a dual seam where an air channel
2.1 ASTM Standards:
exists between the two welded zones. Both ends of the air
D4437 Practice for Non-destructive Testing (NDT) for De-
channel are sealed and then a pressure gauge is attached to the
termining the Integrity of Seams Used in Joining Flexible
airspace.Airpressureisappliedandthegaugeismonitoredfor
Polymeric Sheet Geomembranes
excessive gauge air pressure drop.
D4439 Terminology for Geosynthetics
4.2 Air pressures used in this practice are related to the
D4491 Test Methods for Water Permeability of Geotextiles
thickness, stiffness and material type of the geomembrane.
by Permittivity
4.3 The minimum monitoring time is recommended to be
2 min following stabilization of the pressure.
This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-
4.4 Maximum allowable loss of air pressure varies depend-
thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
ing upon thickness, stiffness and type of material of the
Current edition approved June 1, 2011. Published July 2011. Originally approved
in 1995. Last previous edition approved in 2006 as D5820 – 95 (2006). DOI: geomembrane.
10.1520/D5820-95R11.
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 Available from the Superintendent of Documents, U. S. Government Printing
the ASTM website. Office, Washington, DC 20402.
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D5820 − 95 (2011)
5. Significance and Use 7.4 Remove the flexible hose that connects the air channel
tothepressuregauge.Followingpressurestabilization,observe
5.1 The increased use of geomembranes as barrier materials
the air pressure gauge for the desired test time. The test time
to restrict liquid or gas movement, and the common use of dual
should be a minimum of 2 min. Mark the time and pressure of
track seams in joining these sheets, has created a need for a
the beginning and end of the test on the geomembrane with a
standard nondestructive test by which the quality of the seams
visible marker. The maximum allowable pressure drop may be
can be assessed for continuity and water tightness. The test is
compared to the maximum allowable value.
not intended to provide any indication of the physical strength
7.5 If the pressure does not drop below the maximum
of the seam.
allowable value after the specified test period, open the air
5.2 This practice recommends an air pressure test within the
channel at the end away from the pressure gauge. Air should
channel created between dual seamed tracks whereby the
rush out and the pressure gauge should register an immediate
presence of unbonded sections or channels, vo
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