ASTM D7700-22 PDF
Standard Guide for Selecting Test Methods for Geomembrane Seams
Standard Guide for Selecting Test Methods for Geomembrane Seams
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 4
- Дата публикации:
- 1 июля 2022 г.
- Издание:
- D7700
- ICS:
- 59.080.70
SIGNIFICANCE AND USE 4.1 There are a large number of geomembrane types and seaming techniques. This guide is intended to help practitioners select the appropriate seam test methods for their material. 4.2 Geomembranes are relatively impermeable planar materials sheets that are shipped either as rolls or folded panels. The panels may be seamed in a factory or in the field. This guide provides geomembrane users with the most appropriate seam evaluation techniques for the most common geomembrane materials available on the market. 4.3 Some types of geomembrane may not be listed and some seam evaluation techniques may offer a good performance with a given material although this may not be indicated in Table 1. Users who are aware of this situation are invited to contact ASTM to propose an update of this guide. X = Applicable — = Not Applicable O = May Be Applicable (A) This type of test not commonly performed on this type of material, but it can be performed if desired.(B) Only provides evaluation of seam continuity, but not seam strength.(C) May not be applicable to very flexible geomembranes, especially thinner ones, that will highly deform into the vacuum box.(D) There are some experiences with air lance on HDPE geomembrane seams for hole detection, although this is not common practice.(E) Typically applicable to materials that are 1.0 mm and thinner.(F) When applicable.(G) Applicable to dual track seam only.(H) Not applicable to extrusion fillet.(I) Applicable to factory seams only.(J) Refer to Guide D6747.(K) Electrical leak location surveys are useful to monitor the continuity of seams, as well as to survey the entire sheet after installation and, where applicable, while covered with earthen or liquid materials. They do not verify material or seam integrity. 4.4 The relevance of a seaming technique within a particular engineering context is beyond the scope of this guide. SCOPE 1.1 This guide is intended for use as a summary of test methods necessary to evaluate geomembrane seams. It is intended to guide geomembrane users toward the appropriate evaluation techniques to assess geomembrane seam quality. 1.2 Geomembrane seams covered by this guide are: high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), flexible polypropylene (fPP), polyvinyl chloride (PVC), ethylene propylene diene terpolymer (EPDM), prefabricated bituminous geomembranes (PBGM), ethylene interpolymer alloy (EIA), and reinforced geomembranes 1.3 Although a significant effort has been made to gather all types of geomembranes and related evaluation techniques which were on the market at the date of completion of this document, some available materials and technologies may have been omitted. The information presented in this document shall thus be considered to be non-exhaustive. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D7700-22: Standard Guide for Selecting Test Methods for Geomembrane Seams provides essential guidance for practitioners, contractors, and engineers in selecting appropriate evaluation techniques for geomembrane seam quality. Geomembranes are crucial in containment and barrier applications, and their seams must be evaluated to ensure material integrity. This guide offers a summary of destructive and nondestructive seam test methods applicable to a wide range of geomembrane types, including high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), flexible polypropylene (fPP), polyvinyl chloride (PVC), ethylene propylene diene terpolymer (EPDM), prefabricated bituminous geomembranes (PBGM), ethylene interpolymer alloy (EIA), and reinforced geomembranes.
Key Topics
- Geomembrane Seam Testing: The guide covers both destructive techniques, which require removal of a sample to test strength or elongation, and nondestructive techniques, which evaluate seam continuity along the installed length.
- Applicability: Test methods are matched to specific geomembrane materials and seaming techniques. Not all tests are suitable for all types, and users are encouraged to consult ASTM for updates if emerging materials or methods are not included.
- Types of Test Methods:
- Destructive Tests: Assess seam strength or elongation, typically by removing and testing a sample.
- Nondestructive Tests: Include air lance, vacuum box, spark test, ultrasonic testing, and various electrical leak location methods.
- Test Selection Considerations: The selection depends on the geomembrane type, seam construction, installation context (factory or field), and project-specific requirements.
Applications
ASTM D7700-22 is widely applicable in geosynthetics, waste containment, water resources management, mining, and environmental protection projects. Typical uses include:
- Quality Assurance and Quality Control (QA/QC): Ensuring the integrity of geomembrane seams during installation and after project completion.
- Field Inspection: Selecting appropriate field and laboratory test methods to verify seam continuity and strength with minimal disruption.
- Material Compatibility Assessment: Matching the seam evaluation technique to the geomembrane material, such as HDPE, PVC, or reinforced products.
- Regulatory Compliance: Satisfying project specifications and regulatory standards for geomembrane installation in landfills, ponds, canals, and reservoirs.
- Maintenance and Leak Detection: Employing electrical leak location, water lance, and vacuum chamber methods to detect and mitigate leaks in installed systems.
Related Standards
Several ASTM standards complement or are referenced by ASTM D7700-22, providing additional detail on specific seam testing procedures:
- ASTM D4437: Practice for Nondestructive Testing (NDT) for Determining the Integrity of Seams in Flexible Polymeric Sheeting
- ASTM D5641: Practice for Geomembrane Seam Evaluation by Vacuum Chamber
- ASTM D5820: Practice for Pressurized Air Channel Evaluation of Dual-Seamed Geomembranes
- ASTM D6365: Practice for Nondestructive Testing of Geomembrane Seams Using the Spark Test
- ASTM D6392: Test Method for Integrity of Nonreinforced Geomembrane Seams by Thermo-Fusion Methods
- ASTM D7006: Practice for Ultrasonic Testing of Geomembranes
- ASTM D7007, D7953, D6747: Various practices and guides for electrical leak location and mapping in geomembrane installations
For a comprehensive approach to geomembrane seam evaluation and to ensure compliance with best practices, users should consult these related standards alongside ASTM D7700-22.
Keywords: ASTM D7700-22, geomembrane seam testing, destructive testing, nondestructive testing, geosynthetics, HDPE, PVC, electrical leak location, barrier integrity, seam evaluation methods, environmental protection, QA/QC in geomembrane installation.
Технические детали
- Технический комитет
- D35 - Geosynthetics
- SKU
- ASTM D7700-22
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