ASTM D5820-95(2006)
(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 D 4437 for geomembrane seams that include an air channel. Practice D 4437 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.
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
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D5820–95 (Reapproved 2006)
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 spection Techniques for the Fabrication of Geomembrane
Field Seams
1.1 The practice covers a nondestructive evaluation of the
continuity of parallel geomembrane seams separated by an
3. Terminology
unwelded air channel. The unwelded air channel between the
3.1 Definitions:
two distinct seamed regions is sealed regions is sealed and
3.1.1 dual seam, n—a geomembrane seam with two parallel
inflated with air to a predetermined pressure. Long lengths of
welded zones separated by an unwelded air space.
seam can be evaluated by this practice more quickly than by
3.1.2 Discussion—The dual seam itself can be made by a
other common nondestructive tests.
number of methods, the most common being the hot wedge
1.2 This practice should not be used as a substitute for
technique. Other possible methods include hot air and ultra-
destructive testing. Used in conjunction with destructive test-
sonic bonding techniques.
ing, this method can provide additional information regarding
3.1.3 geomembrane, n—an essentially impermeable geo-
the seams undergoing testing.
synthetic composed of one or more synthetic sheets.
1.3 This practice supercedes Practice D4437 for geomem-
3.1.4 Discussion—In geotechnical engineering, imperme-
brane seams that include an air channel. Practice D4437 may
able essentially means that no measurable liquid flows through
continue to be used for other types of seams. The user is
a geosynthetic when tested in accordance with Test Methods
referred to the referenced standards, or to EPA/530/SW-91/051
D4491.
for additional information regarding geomembrane seaming
3.1.5 seam, n—a permanent joining of two or more mate-
techniques and construction quality assurance.
rials.
1.4 This standard does not purport to address all of the
3.2 For definitions of other terms, see Terminology D4439.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
4.1 This practice utilizes a dual seam where an air channel
bility of regulatory limitations prior to use.
exists between the two welded zones. Both ends of the air
channel are sealed and then a pressure gauge is attached to the
2. Referenced Documents
2 airspace.Airpressureisappliedandthegaugeismonitoredfor
2.1 ASTM Standards:
excessive gauge air pressure drop.
D4437 Practice for Non-destructive Testing (NDT) for De-
4.2 Air pressures used in this practice are related to the
termining the Integrity of Seams Used in Joining Flexible
thickness, stiffness and material type of the geomembrane.
Polymeric Sheet Geomembranes
4.3 The minimum monitoring time is recommended to be
D4439 Terminology for Geosynthetics
2 min following stabilization of the pressure.
D4491 Test Methods for Water Permeability of Geotextiles
4.4 Maximum allowable loss of air pressure varies depend-
by Permittivity
ing upon thickness, stiffness and type of material of the
2.2 Other Standard:
geomembrane.
EPA/530/SW-91/051 Technical Guidance Document: In-
5. Significance and Use
5.1 The increased use of geomembranes as barrier materials
This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-
to restrict liquid or gas movement, and the common use of dual
thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
Current edition approved June 1, 2006. Published June 2006. Originally track seams in joining these sheets, has created a need for a
´1
approved in 1995. Last previous edition approved in 2001 as D5820 – 95 (2001) .
standard nondestructive test by which the quality of the seams
DOI: 10.1520/D5820-95R06.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5820–95 (2006)
can be assessed for continuity and water tightness. The test is the beginning and end of the test on the geomembrane with a
not intended to provide any indication of the physical strength visible marker. The maximum allowable pressure drop may be
of the seam. compared to the maximum allowable value.
5.2 This practice recommends an air pressure test within the 7.5 If the pressure does not drop below the maximum
channel created between dual seamed tracks whereby the allowable value after the specified test period, open the air
presence of unbonded sections or channels, voids, nonhomoge- channel at the end away from the pressure gauge. Air should
nities, discontinuities, foreign objects, and the like, in the rush out and the pressure gauge should register an immediate
seamed region can be identified. drop in pressure, indicating that the en
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.