Grekkon Limited trains technicians and farmers on how to weld dam liners during installation or pond liner repairs. Welding is for every dam liner who’s width is beyond 8M to fit the water pan or tank. This is because our dam liner rolls are 8M wide. It is irrespective of the fish pond liner’s thickness or material type. Our dam liners thicknesses are; 0.5mm, 0.75mm, and 1mm, and the material is either a high density polyethylene (HDPE) geomembrane, or a poly-vinyl chloride (PVC) type. Both materials have anti-UV treatment to withstand solar degradation in UV intense tropical locations
Dam liner welding is done prior to installation. To understand the welding process fully, a grower must first learn the dam liner installation process
Steps on How to Install Dam liners in Kenya
Water Pan Excavation
This is the first step and usually takes the longest time. Excavation is manual with hand-tools, or with a machine. Most common machines for dam excavation are backhoe loaders, bull-dozers and caterpillars. At excavation, the side walls are inclined at an angle to prevent collapse of the dam.
Smoothening Of The Water Pan
This is to remove any sharp objects that damage the dam liner. Pour in water on the floor and sides to soften it.
Trenches are dug round the dam where the dam liner will be installed. The size of the trench will depend on the size of the dam and the dam liner thickness. The most popular trench sizes are 1ft deep by 1ft wide and 1.5ft deep by 1.5ft wide.
Welding structures the pond liner to the water pan’s or tank’s shape, so as to hold water. The welded joints must be leak free for the dam liner to work effectively in the tank or water pan. Lined water pans are popular as water storage units for agricultural field crops irrigation in a country that has just one or two rainy seasons
How To Weld Dam Liners
- Factory welding. Depending on the dam liner size, weld it whole or partially in the factory. The weight and volume of the welded material must be easily portable on site. The latter factor guides on how much of the dam liner material will be put together in the factory
- Site or field welding. This is done on site at the point of dam liner installation. It is the joining together of the partially welded dam liner pieces from the factory. Site welding is done when the entire dam liner could not be wholly put together in the factory. This is as a result of weight or bulkiness, which limits lifting and transportation of the bulky and heavy material. The weight size of the portable material depends on the thickness of the dam liner. The thicker it is, the less it is
- A wedge welding machine or a heat gun/ heat blower is the equipment that does dam liner welding. A wedge machine is what does it in the factory. The heat gun is highly portable, and so is best for field joinery
Dam liner welding involves melting the liner material under high temperature at the point of joining them. Once melted, the 2 layers are laid one over the other and as they harden, become one unit
Both equipment run on electric power. In off grid electricity locations, Grekkon Limited provides a generator to power the heat gun or wedge welding machine