KST CPL Protective Linings, supplies HDPE and PVC linings in different profiles and thicknesses tor our Pipe-Lining business. The same grades, plus flexible polypropylene are available tor lining (concrete) structures and tanks. We can supply our T-Grip™ lining in any colour, the main colours are black, white, blue and orange.
The process:
- Organic sulphates and inorganic sulphides are present in the slimes of sewerage flows and form the total sulphides present in the sewerage.
- A fraction of the dissolved hydrogen sulphide is released into the sewer atmosphere as a gas.
- A process of bacterial reduction occurs when the hydrogen sulphide, in combination with the other gases, such as carbon dioxide, is progressively oxidized, reducing the Ph to the point where it splits off with water molecules to form sulphuric acid.
- The powerful inorganic sulphuric acid reacts with hydrated calcium silicates and lime in the cement structure and reduces it to a soft swelling paste.
- Conditions are optimal for this process of sulphide attack when there is biological oxygen demand, presence of sulphates (Common in all water systems), higher ambient temperatures (quickening the kinetics of breakdown and reduction), long detention time (flat grades – low velocities)
- Provision of a lining made of flexible plastic that is chemically inert when subjected to sulphuric acid attack. The lining shall be made from thermo-plastic PE / PVC or other flexible plastic, provided there are no pin-holes and that an effective way of attaching the plastic to the concrete is devised.
- Paint or coatings do not adhere very well to concrete - neither do glues or adhesives – problem.
- The solution was found in 1947 when the first T-ribbed liner were made in the USA. Being cast into concrete, at the time of manufacture, the T -ribbed lined pipes were fully protected by mechanically anchored PVC plastic liners.
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- These linings were extruded under heat and pressure to form a high grade plastic of high molecular weight, intrinsically free of voids and pin-holes in its structure. Further, the lining was thermoplastic, meaning that it could be heated to melting point, allowed to cool, and it would remain unchanged in alt physical and chemical characteristics. This meant that the material could be fused to itself by the application of heat, thus rendering it weldable into continuous lengths.
- In the early 1990's, KST Holland B.V., then a supplier of PVC T-Grip™ liners innovated the T-ribbed polyethylene lining system, thus improving the generics of the type, by providing stronger and more chemically resistant plastics such as Linear Low Density Polyethylene (LLDPE, High Density Polyethylene (HDPE].
- Since these developments our T-Grip™ lining system which includes PVC and the Polyethylenes have been widely accepted on tour continents as the benchmark of quality and innovation.
- KST CPL. Holland B.V. offers 2 ribbed profile variants in t-profile and V-lock profile tor various types of lining processes.
- The KST T-Grip™ lining system is the ultimate solution to the problem of hydrogen sulphide attack in (concrete) wastewater storage and conveyance systems.