Why Geomembrane Liners’ Final Specifications Shouldn’t Include Weight and Thickness
The best piece of advise we can provide anyone thinking about installing a pond liner or geomembrane pit is to speak with us before writing the final project specs. This is significant because, by themselves, the measurements and specifications provided by the tests and standards for the individual geotextiles may not be sufficient to satisfy the project’s total needs.
Any project’s shipping to the field and installation there are major aspects. The improper material may be chosen for the project, leading to project failure, if puncture resistance and permeability parameters are relied upon solely.
While all geotextiles, for instance, have a nominal thickness when made in a factory, actual environmental factors like packaging, shipping, and load weight might affect a geotextile’s properties. Additionally, and perhaps most importantly, the material selection will determine the size of the panels and the quantity of field welds necessary to produce the ultimate size of the liner.
Although a puncture from rocks or other things entering the material could result from a careless installation, our understanding of industry practise suggests that the most likely source of failure will be a seam breaking under pressure from a subpar panel weld.
Durability is important in most liner projects because installing a geophysical installation is difficult enough without having to dig it up and repair it. The guarantee offered by the manufacturer and installation may be one of the finest ways to ensure durability in practical terms. When writing specs, Singhal Industries Private Limited always aims for a 20-year warranty as our standard.
Applying the same technical standards to geomembrane and geotextile materials is not as simple as it is for soil, which has amassed very reliable standards through testing and computation over time. It is possible to accurately determine the qualities of soil because it exists and is stable. The variable being introduced is geosynthetic materials, and this has an impact.
Some Guidelines for Geotextile Selection
The ASTM D4833 puncture test, which uses a small piece of material and a probe driven through it with a quantifiable force, is one of the commonly used standards to compare various materials for use in a liner project. A PSI standard for the material is produced as a result. As ASTM notes, this test is utilised for HDPE, and other woven geotextiles might not be compatible with this standard.
We have developed the tightest weave of any comparable geotextile in the industry since we find that tightness of the weave, not material coating, is the most important aspect for puncture-resistance in woven RPE products from Singhal Industries. The D4833 measurement is one of the RPE features that we do provide.
Although it’s more of a strength test than a puncture test, the CBR test, D6241, is another standard for puncture resistance that is evaluated in PSI. There are also a number of tensile strength tests mentioned, including the D7004 and D7003 ASTM standards.
All permeability tests are based on the material’s nominal thickness, which is problematic because, as we mentioned above, the actual thickness in the field may differ due to transportation stress. Therefore, the engineering calculations based on the specified specifications could not be accurate in the end. The ASTM D4491 permittivity test is perhaps the most accurate standard for measuring fluid flow through a geomembrane.
Exceeding the requirements for geotextiles
Consider our Aqua Series RPE geotextiles to get a sense of our material properties. This material surpasses all of the ASTM criteria for string reinforced geotextiles using a thickness of 12 mil as a benchmark. In both the D4833 and the CBR tests, it provides a tensile strength that is more than 50% higher and a puncture resistance that is more than twice as high.
And the geomembranes of our Aqua Series are over 60% lighter! Weight obviously has a direct impact on how readily it can be placed when welding panels together in the field as well as how easily it can be shipped to the field. While it’s common practise in project design to aim for the heaviest and thickest material, we believe that a product that is meant to be lighter, thinner, and stronger can be more effective.
The argument is that even though the materials produced by Singhal Industries Private Limited exceed ASTM standards, we still don’t want to base project specifications solely on engineering requirements. Before developing the final specifications, it is essential to thoroughly research the project from all angles, including any non-measurable ones like shipment and installation.
We may draw one basic conclusion from this discussion of various testing standards used in creating the specifications for a liner project, which is also where we started: talk to us before putting up the technical requirements. Get our advice, and then draught the specifications for an effective project outcome that is fully assured for durability.
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