40 mil PVC liner is the geomembrane liner which has high tensile mechanical properties, its excellent elasticity and deformation ability makes it very suitable for expansion or contraction of the base surface. HDPE geomembrane liner can effectively overcome the uneven settlement of the base surface. 40 mil pvc liner has excellent chemical stability, high water vapor permeability coefficient, it is widely used in sewage treatment, chemical reaction ponds, landfills. The 40 mil pvc liner also has high and low temperature resistance, resistance to asphalt, oil and tar, acid, alkali, salt and other 80 kinds of strong acid and alkali chemical medium corrosion. The service life of the material up to 50-70 years, to provide a good material guarantee for environmental seepage.
1. Why Chose 40 mil PVC Liner for Tallings Project in Ghana
The development of Ghana’s mining industry has brought not only a large amount of ore, but also a lot of tailings. Tailings are easy to flow and collapse when stacked, resulting in vegetation destruction and injury accidents, especially in the rainy season, which is prone to collapse and landslide. The dam body of tailings reservoir is high, and there are unsafe hidden dangers. The composition of tailings and residual mineral processing agents have serious damage to the ecological environment, especially the tailings containing heavy metals, in which sulfides produce acidic water to further leach heavy metals, and its loss will cause harm to the entire ecological environment. Therefore, anti-seepage measures are usually taken for tailings pond, and the anti-seepage material is anti-seepage HDPE Geomembrane.
Ghana customers found our professional salesman through BPM website, he won an HDPE geomembrane installation project for tailings treatment, he got of in-depth communication with us, after our engineers and sales analysis, we recommended to use 40 mil PVC liner, and we delivered free sample to customer by international express. After testing, the indicators met the requirements, he placed an order of 100,000 square meters for the first phase.
2. Characteristics of 40 Mil PVC Liner
- PVC geomembrane is a kind of flexible waterproof material, with high permeability coefficient.
- Geomembrane PVC liner has good heat resistance and cold resistance, its use of ambient temperature is low 110℃, high temperature -70℃.
- Geomembrane PVC liner has good chemical stability.
- Geomembrane PVC Liner has high tensile strength, so that it has a high tensile strength to meet the needs of high standard engineering projects.
- 40 mill pvc liner has strong weather resistance, has strong anti-aging performance.
- PVC geomembrane has strong tensile strength and elongation at break, so that HDPE geomembrane can be used in a variety of different harsh geological and climatic conditions. Adapt to geological uneven settlement of strong stress.
- In the production process, quality inspection personnel according to the batch of timely stop sampling of HDPE Geomembrane, testing items include the following three aspects: (A)The appearance of polyethylene geomembrane, physical sensitivity including: unit area quality determination, amplitude determination, thickness determination; (B) The mechanical properties of polyethylene HDPE geomembrane include: wide strip tensile test, trapezoidal tearing strength test, CBR top breaking strength test, falling cone test, etc. (C)The hydraulic performance test of polyethylene HDPE geomembrane includes vertical permeability test, hydrostatic pressure test, etc.
3. PVC Liner Instaaltion for Tallings Project in Ghana
3.1 Geomembrane pvc liner preparation before laying
- Level the site of the ground, make its surface smooth, compact, no bump on the surface of the ground, no big stones, iron wire steel wire and other hard things, to prevent punctured impermeable film;
- A 40*40 anchorage ditch is dug around the landfill to prepare for the anchorage of the impermeable film on both sides of the landfill.
3.2 Laying of Geomembrane PVC Liner
- HDPE Geomembrane coil to be laid is flattened in the open space and cut into the required shape according to the predetermined scheme;
- In the process of film laying to avoid artificial damage, should be smooth, solid, reduce wrinkles as far as possible, reasonable choice of laying direction, as far as possible to reduce joint force, reasonable layout of each piece of material position, strive to joint as little as possible;
- Flat on the ground of membrane, the reasonable way of calculation, the selection of membrane, to reduce the number of welding seam and save material for the standard, in the process of membrane to avoid man-made damage, adjacent HDPE Geomembrane welding seam dislocation according to the “ding” glyph laid, moreover membrane note reserved unearthed membrane deformation expansion amount, general reserve capacity by 1% to 4%, According to the actual situation of the specific site, in order to prevent the seepage film from being torn by pressure when the foundation is deformed;
- All exposed HDPE Geomembranes must be immediately compressed with sandbags or other heavy weights to prevent the HDPE Geomembranes from being blown up by the wind or pulled out of the surrounding anchorage ditch.
3.3 Welding of 40 mil pvc liner
The climatic conditions required for the Geomembrane welding and suturing are: atmospheric temperature between 4-40℃; Dry conditions, especially the absence of precipitation or other excess moisture such as fog or dew; The wind speed is no more than force 4 per hour.
HDPE Geomembrane construction matters needing attention for tailings reservoir
3.3.1 Matters needing attention of construction personnel
- Before laying HDPE Geomembrane, the laying surface should meet the design requirements and meet the quality and safety requirements;
- The material and quality of geomemetic electrode should meet the design requirements and relevant standards;
- Personnel unrelated to the construction shall not enter the construction site;
- All personnel entering the HDPE Geomembrane construction site shall wear an entry card, wear shoes without damage to the HDPE Geomembrane, and no one shall smoke when entering the site;
- In handling HDPE Geomembrane, all tools must be handled gently, not thrown or replay, hot tools and HDPE Geomembrane contact is strictly prohibited.
- HDPE Geomembrane construction must be completed to pay attention to the protection of finished products;
- HDPE Geomembrane in the process of loading and unloading, handling shall not use any equipment that may cause mechanical damage to the material, pull, lift or roll up, do not allow some uncontrolled expansion method, gently take gently.
3.3.2 Precautions for welding
In the welding process of HDPE Geomembrane, in order to prevent the film from being blown up by strong winds after laying, it is advanced successively by laying and welding compaction. Before welding, the HDPE Geomembrane reserved lap welding surface is wiped clean; The roller of the welding film machine should be wiped clean, and the sample welding equipment can be adjusted before welding. When welding, always keep the welding machine moving at a uniform speed. Weld inspection test shall be carried out after the weld is cooled until the weld meets the requirements.
3.3.3 Repair defects and damage
- In the process of HDPE Geomembrane laying, any defective or damaged HDPE Geomembrane to non-destructive experiment should be repaired, so as not to affect the overall anti-seepage effect.
- Small holes should be repaired by extrusion welding. If the holes are larger than 6mm, patches should be made;
- The peel should be patched. If the peel has a sharp end on the slope, it should be cut into a circle before patching;
- The surface of the HDPE Geomembrane that needs to be patched should be repaired, polished and cleaned in advance;
- The folded HDPE Geomembrane should be re-laid to patch the welding position should be parallel to the slope, not cross;
- The patch should be composed of the same geomembrane and cut into circular or elliptical shapes, and its size should exceed the defect edge by at least 15cm;
- All patches should be of the same thickness as the original HDPE Geomembrane, and almost all patches should be flattened with a sander at the top edge before being placed on the HDPE Geomembrane, and all surfaces should be kept clean and dry during repair;
- Non-destructive tests should be carried out on each repair site and records should be made.
4. 40 Mil PVC Liner Fixation and Protection
During the HDPE Geomembrane construction of tailings pond, anchoring should be carried out around, anchoring ditch should be used for edge sealing. Anchoring ditch should be ditched 40cm away from the construction plane, 40cm wide and 40cm deep, and the HDPE Geomembrane should be pulled into the ditch into u-shaped, and the ditch should be fixed with sandbags or concrete structure. At the same time, in order to strengthen the protection of HDPE Geomembrane and make its service life long, the following measures are generally taken for protection:
- Spread a layer of geotextile on the paved film to protect, and then spread a layer of sand or soil on the geotextile to secondary protection; Lay a fine layer of soil on top of the film or make a layer of concrete with barbed wire and beautify it.
- HDPE Geomembrane can be constructed in a wet environment, but should avoid soaking in water.
- if the ground has moisture, to do a good job of drainage measures after laying, in order to prevent the HDPE Geomembrane sticky water can not be welded.
- Loading and unloading according to the principle of careful handling, strictly prohibit throwing, dragging, rolling damage.
- HDPE Geomembrane should be stored in a cool and dry place when not in use, and exposure to sunlight and rain are strictly prohibited.
5. Specifications of 40 mil PVC Liner for Tallings Project in Ghana
- HDPE Geomembrane – 40 mil
- Total Quantity – 100,000 Square meters
- Each roll Size – 7m*50m
- Standard – ASTM GM13 standard
About BPM Geomembrane
BPM has been specializing in delivering one stop geosynthetics products and solutions to worldwide customers since its foundation in 2007. BPM had provided many types of effective and state of the art geomembranes, geotextiles, geocells, geosynthetic clay liners (GCLs), drainage boards, geogrids to over 81 countries.
BPM Geomembrane is not only manufacturing best quality geosynthetic products but also providing professional design and installation service. OEM, ODM, custom development and fabrication are also available. If you have any questions or inquiries, please contact us, we will reply as soon as possible.
