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PANEL WATER
TANKS

HDPE Lining

HDPE Lining System

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  • Application: Used to form protective barrier for internal of steel tank, Reinforced Concrete (R.C.) tank, sewage tank, aquaculture / landscape ponds, create irrigation channels and etc.
  • Expected life span of more than 20 years.
  • High Density Polyethylene (HDPE) geomembranes is an inert membrane, extruded in form, and contains approximately 97.5% polyethylene, 2.5% carbon black and traces amounts of antioxidants and heat stabilizers.
  • All HDPE liners are UV stabilized and high resistant to rodent, microorganisms and to long list of chemicals such as oily waste and acids.
  • HDPE liners are usually black but other pigment colors are available on request.
  • HDPE liners are smooth surface and have high flexibility for the ease of installation and welding (hot wedge / extrusions) to suit tank shapes and complex configurations.
  • SUNNIK HDPE lining system ensures high quality, integrity and durability. We offer warranty periods ranging from 2-10 years subject to mutual agreement.
  • Insulation between liners is available as an option.
    • Further detail on service would be gladly furnish upon request.
    • Installation of HDPE liners shall only be performed by qualified installers.
Why Choose HDPE Linings?

The growing concern over contamination of valuable water resources and fluid migration to subsurface of concrete or steel has resulted in the increasing awareness of interest in, and demand for geomembranes. Geomembranes are made from polymeric materials to replace the more traditional porous liners such as concrete and mild steel. The increasing demand of geomembranes over the traditional porous liners is due to the oxidation of chlorine that is added in water to kill bacteria neutralizes the surface of concrete walls, promoting corrosion of reinforcement bars and degradation of equipment in tank. This will incur continuous repairs at great expense to the owner.

The primary function of geomembranes is to provide impermeable water or liquid. They are usually made from continuous polymeric sheets that are very flexible. Typical values of permeability tests are in the range of -10 to 10. Continuous development is resulting in new product advances and new manufacturing technologies.

HDPE Liners

HDPE sheet is a high quality, high density polyethylene (HDPE) geomembranes with two co extruded, textured surface and consisting approximately 97.5% polyethylene, 2.5% carbone black and trace amounts of antioxidants and heat stabilizers; no other additives, filters or extenders are used. The resin used is specially formulated virgin polyethylene and is designed specifically for flexible Geomembrane applications. It has excellent resistance to UV radiation and is suitable for exposed condition. This product allows projects with greater slopes to be designed since frictional characteristics are enhanced, and the smooth edges allow for an easier, quicker welding process and future maintenance. This material is non-toxic and is certified safe by Standard and Industrial Research (SISIR), The British River Thames Water Authority Board and similar Authorities Worldwide. (refer to product specifications).

Advantages

Ruggedness combined with flexibility. High puncture and crack resistance, non-brittle, rust free, maintenance minimize and resistance to microorganisms, plants and rodents.

Chemical Resistance

HDPE geomembranes are made of high quality, virgin polyethylene which demonstrates excellent chemical resistance i.e. oily wastes, acids, and hydrocarbons. It is resistant to a great number and combinations of chemical. Under normal conditions aggressive organic solvents and inorganic acids do not cause any serious effects. (refer to chemical resistance chart).

Installation Procedure

Preliminaries

The Liner installation area should be inspected prior to commencing deploymnet. The surface should provide a firm, unyielding foundation for the membrane with no sudden, sharp, or abrupt changes or break in grade, which may damage the liners.

Installation

Attached liners to steel or concrete tank walls using bolted stainless steel or HDPE batten strips.

Typical fusion weld detail

Fusion wedge welding – is the primary method for joining two adjacent, overlapped geomembranes. The wedge welder creates a fusion weld by heating the facing overlapped surfaces and then pressing them together while in a molten state. The result is a permanent bond. The wedge welding method is fast and consistent. In addition, wedge welders produce a double-track weld (see figure A) between these two weld tracks is an air channel which is used to non-destructively air pressure test the integrity of the seam.

Typical extruded weld detail

Extrusion welding – is necessary for non-linear seams, roll ends, pipe penetrations, patches or anywhere that it is impractical to use a wedge welder. At the sheet overlap, the extrusion welder integrates molten polyethylene onto the prepared Geomembrane seam to create a permanent weld (see figure B). The result is a continuous connection of the adjacent panels through the seam. The extruded welding materials are manufactured from the same resin as Geomembrane itself and therefore exhibit same chemical resistance and physical properties.

Non-Destructive Seam Continuity Testing

We shall non-destructively test all field seams over their full length using a spark tester, vacuum tester unit or other approved method. The purpose of nondestructive test is to check the continuity of seams. It does not provide information on seam strength. Continuity testing shall be carried out as the seaming work progress, not the completion of all field seaming.

Service and Support

Steelwork provides complete service and support for your project’s lining installation. Details drawings can be provided as well as extensive technical and estimating support to help guide the design to the most economical and constructible configuration which meets the project’s requirements. This total projects capability reflects our experience and knowledge of the synthetic lining industry and our commitments to the needs of the customer.

Warranty

A final inspection shall be conducted by all parties once the above works has been carried out successfully and approved; a completion certificate shall be signed.

Tested Property Test Method Frequency Minimum Average Value
30 mil 40 mil 60 mil 80 mil 100 mil
Thickness, (minimium average) mil (mm)
Lowest individual reading (-10%)
ASTM D 5199 Every roll 30 (0.75)
27 (0.69)
40 (1.00)
36 (0.91)
60 (1.50)
54 (1.40)
80 (2.00)
72 (1.80)
100 (2.50)
90 (2.30)
Denisty, g/cm3 ASTM D 1505 200,000 lb 0.94 0.94 0.94 0.94 0.94
Tensile Properties (each direction)
Strength at Break, lb/in-width (N/mm)
Strength at Yield, lb/in-width (N/mm)
Elongation at Break, %  Elongation at Yield, %
ASTM D 6693, Type IV
Dumbell, 2 ipm
20,000 lb 120 (21)
66 (11)
70013
152 (26)84 (14)
700
243 (42)
132 (23)
70013
327 (57)
177 (30)
70013
410 (71)
212 (37)
700
13
Tear Resistance, lb (N) ASTM D 1004 45,000 lb 21 (93) 28 (124) 42 (186) 58 (257) 73 (324)
Puncture Resistance, lb (N) ASTM D 4833 45,000 lb 65 (289) 85 (378) 125 (556) 160 (711) 195 (867)
Carbon Black Content, % (Range) ASTM D 1 603*/421 8 20,000 lb 2.0 – 3.0 2.0 – 3.0 2.0 – 3.0 2.0 – 3.0 2.0 – 3.0
Carbon Black Dispersion ASTM D 5596 45,000 lb Note1 Note1 Note1 Note1 Note1
Notched Constant Tensile Load, hr ASTM D 5397, Appendix 200,000 lb 1000 1000 1000 1000 1000
Oxidative Induction Time, min ASTM D 3895, 200°C;
O2, 1 atm
200,000 lb > 140 > 140 > 140 > 140 > 140
Typical Roll Dimensions
Roll Length(2), ft (m) 1,120 (341) 870 (265) 560 (171) 430 (131) 340 (104)
Roll Width(2), ft (m) 22.5 (6.9) 22.5 (6.9) 22.5 (6.9) 22.5 (6.9) 22.5 (6.9)
Roll Area, ft(2) (m(2)) 25,200 (2,341) 19,575 (1,819) 12,600 (1,171) 9,675 (899) 7,650 (711)

Notes:

  • (1)Dispersion only applies to near spherical agglomerates. 9 of 10 views shall be Category 1 or 2. No more than 1 view from Category 3.
  • (2)Roll lengths and widths have a tolerance of ± 1%
  • GSE HD is available in rolls weighing approximately 3,900 lb (1,769 kg)
  • All GSE geomembranes have dimensional stability of ± 2% when tested according to ASTM d 1204 and LTB of <-77°C when tested according to ASTM d 746.

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