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November 19, 2013
Thickness of HDPE Pond Liners
Ronaldo Soares (firstname.lastname@example.org): I am looking for HDPE (high-density polyethylene) liners for intensive biofloc ponds. My soil is sandy with not many rocks. I’m very much in doubt about what thickness of HDPE to use—0.5, 0.8 or 1.0 millimeters (mm)? Please forward some information on the best thickness of HDPE to use in biofloc ponds.
Freek Huskens (email@example.com): My experience is that 0.75 mm HDPE lasts for a very long time if properly installed.
Michel Van Ruijven (firstname.lastname@example.org): Ronaldo, the most imported thing is to make sure that only sand is touching the HDPE. Make sure you remove all the rocks from the bottom and sides of the pond before you install the liners. Make sure the HDPD is not under any tension in the corners. Make sure than no animals—turtles, rats or rabbits—crawled under your HDPE as or after you installed it because they may chew their way out. Above the waterline, cover the area with woven plastic or some other type of ground cover to prevent vegetation from growing under the liners. Thickness? I think 0.5 mm should be enough.
Ian Nielsen (email@example.com): Ronaldo, I suggest that you contact HDPE suppliers that work with the mining industries. We are a specialist dredging company and clean lined ponds for mining groups in Australia and Africa everyday. They regularly use thicknesses greater than 2.5 mm. Try the following link: http://www.austliningco.com.au/images/stories/GSE_ASIA_HDPE_STANDARD_SPECIFICATION__SHEET_smooth_NEW.pdf [Shrimp News: this link did not work when I clicked on it, but it did work when I copied and pasted it into my web browser.]
Herminiobsimbol (firstname.lastname@example.org): Most important, your liner should be UV (ultraviolet) resistant.
John Birkett (email@example.com): Any pointy object that hits a 0.5-millimeter liner will puncture it. If you want your liner to last, go for 1.0 mm.
Geraldo Kipper Foes (firstname.lastname@example.org): Here in Brazil we use thicknesses between 0.5 and 0.8 mm for large ponds and 1.5 mm for raceways and nurseries. We have used HDPE since 2006, and it still looks new.
Christopher Lim Ham Min (email@example.com): Make sure you get UV protection and a warranty of at least 10 years with your liners. Generally, the thicker the liner the better, and you get stronger joints as you increase the thickness, but the price also increases with thicker liners. Don’t use anything thinner than 0.65 mm, which is usually only produced in large quantities, but 0.75 mm should be thick enough.
Actually, the liners are the easy part of the equation. You need to pay special attention to design, installation, welding the pieces together, the right equipment for welding the pieces together and the workers who to do the welding and installation.
Scott Horton (firstname.lastname@example.org): In Mexico, 1.0 mm is the standard liner thickness, but we have also used. 0.75 mm liners, which are 20% cheaper, with excellent results in closed nursery ponds. Michel’s comments are on target. No rocks, just smooth sand and high-quality installation. I would like to add that once you install the liners, you need to make sure your employees are careful when working around the liners on the top of dikes. When moving equipment around, it’s very easy to puncture them. Holes should be sealed quickly to keep water out and to prevent them getting larger.
Ronaldo Soares (email@example.com): Here in Brazil, prices for 0.8 mm, HDPE liners range from $2.89 to $3.12 a square meter. In China, prices for the same product average about $1.78, but because of high Brazilian taxes on imports, they would cost me $2.68, or more.
Ronaldo Soares (firstname.lastname@example.org): Thank you everybody for the information on HDPE liners. I’ve decided to go for 0.8 mm liners because they combine good quality at a reasonable price. Furthermore, because our soil is very sandy, we should not have problems with perforations.
Bob Rosenberry (email@example.com): On November 25–29, 2004, there was a discussion on The Shrimp List comparing EPDM and HDPE pond liners, and on October 1, 2005, I summarized that discussion and posted it to my webpage. You can check out my summary at this link.
Source: The Shrimp List (a mailing list for shrimp farmers). Subject: HDPE thickness for intensive biofloc system. November 16–21, 2013.
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