ASTM D5820-95
(Practice)Standard Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes
Standard Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes
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.
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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Designation: D 5820 – 95
Standard Practice for
Pressurized Air Channel Evaluation of Dual Seamed
Geomembranes
This standard is issued under the fixed designation D 5820; 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.
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 D 4437 for geomem-
3.1.4 Discussion—In geotechnical engineering, imperme-
brane seams that include an air channel. Practice D 4437 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
D 4491.
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 D 4439.
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
2. Referenced Documents channel are sealed and then a pressure gage is attached to the
air space. Air pressure is applied and the gage is monitored for
2.1 ASTM Standards:
excessive gage air pressure drop.
D 4437 Practice for Determining the Integrity of Field
4.2 Air pressures used in this practice are related to the
Seams Used in Joining Flexible Polymeric Sheet
2 thickness, stiffness and material type of the geomembrane.
Geomembranes
2 4.3 The minimum monitoring time is recommended to be 2
D 4439 Terminology for Geotextiles
min following stabilization of the pressure.
D 4491 Test Methods for Water Permeability of Geotextiles
2 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.
CGSB 148.1 #112 Dual Seam Non-Destructive Pressure
Testing Method for Geomembranes
5. Significance and Use
EPA/530/SW-91/051 Technical Guidance Document: In-
5.1 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
This practice is under the jurisdiction of ASTM Committee D-35 on Geosyn-
thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
can be assessed for continuity and water tightness. The test is
Current edition approved Oct. 10, 1995. Published January 1996.
Annual Book of ASTM Standards, Vol 04.09.
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Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 5820
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 gage. Air should
nities, discontinuities, foreign objects, and the like, in the rush out and the pressure gage should register an immediate
seamed region can be identified. drop in pressure, indicating that the entire length of the seam
5.3 This technique is intended for use on seams between has been tested. If this does not happen, either the air channel
geomembrane sheets formulated from
...
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