HAZGARD 535 - Biodiesel Containment

LOCATINO: Kyoto Fuels - Lethbridge, Alberta

TIMEFRAME: Fall 2009 SCOPE OF WORK: Supply and Install HAZGARD®535 geomembrane and two layers of LP12 Non Woven Geotextile (Overlay and Underlay)

PROJECT PARTNERS Owner: Kyoto Fuels Installation: Layfield Environmental Systems Material supplier: Layfield Environmental Systems

Challenge

The challenge was to find an appropriate secondary containment lining material that was resistant to biodiesel. Biodiesel consists of long chain alkyl (methyl) esters and is typically produced by chemically reacting lipids (e.g., vegetable oil, animal fat [tallow]) with an alcohol. Biodiesel can be used alone or blended with diesel fuel. The biodiesel at the Kyoto fuel facility was tallow based. There was little or no research on the resistance of geomembrane against this kind of fuel and that presented us with the challenge of finding a suitable material. The other challenge on this job was the constructability of a leak proof containment cell with over 40 square pedestals to be sealed (see picture). Sealing around a circular pile is a lot easier and takes less labour hours when compared to a sealing a square pile.

Solution

Due to complexity of installation, PVC based products were initially considered due to their flexible characteristics. However, little was known about the resistance of PVC based materials against biodiesel. After conducting a battery of tests it was evident that PVC based lining materials tended to get softer when exposed to biodiesel and were not appropriate as a secondary containment liner in a long term application. Layfield also tested HAZGARD ®535 (Fire Code Complaint liner) against biodiesel which did not show any significant changes in material properties and was accepted as the choice of material. To tackle the issue of sealing the square concrete pedestals our construction group came with an innovative solution were bolts were driven into the corners (3” away from the edge) of the pedestals. The HAZGARD® 535 geomembrane was then placed around the bottom of pile and attached with batten bars fastened to the bolts. A neoprene gasket was included to create a tight seal.

Results

Due to complexity of installation, PVC based products were initially considered due to their flexible characteristics. However, little was known about the resistance of PVC based materials against biodiesel. After conducting a battery of tests it was evident that PVC based lining materials tended to get softer when exposed to biodiesel and were not appropriate as a secondary containment liner in a long term application. Layfield also tested HAZGARD ®535 (Fire Code Complaint liner) against biodiesel which did not show any significant changes in material properties and was accepted as the choice of material. To tackle the issue of sealing the square concrete pedestals our construction group came with an innovative solution were bolts were driven into the corners (3” away from the edge) of the pedestals. The HAZGARD® 535 geomembrane was then placed around the bottom of pile and attached with batten bars fastened to the bolts. A neoprene gasket was included to create a tight seal.

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