Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/708666
14 WET NEWS AUGUST 2016 Liners are providing long-term solutions for refurbishing pipes but the installation can be challenging. Finnish resin liner helps finish drainage pipe repairs INSIGHT Pipes & drainage THE CONCEPT • The two-part resin that is applied using a brush system, coating pump and MINI MILLER • A CCTV camera head enables the operator to see the coating operation as it progresses • The resin used for the lining has also been developed so as not to produce harmful gases NEED TO KNOW 1 The new lining can be applied to concrete and cast iron pipes 2 The estimated service life of the new pipe is between 30 and 50 years 3 Once hardened the new lining will withstand flow temperatures from -40 to +120°C THE VERDICT "Once the basic equipment has been purchased the day-to-day running cost of this technology is also minimised because the majority of the system is reused time and again" Heikki Jyrämä, Picote. It is recommended that the resin delivery hose is no longer than 15m from the pipe access • F or many years, when smaller drainage and sewer pipelines have required repair due to deterioration and/or leakage, it has been necessary to either remove the old pipe and replace it with new, or insert a lining into the existing pipe. O•en in the modern industry this will require a significant amount of equipment and site preparation to ensure that the installation procedure can be undertaken safely and efficiently with minimum disruption to the client or those living and working nearby. With many of the lining systems currently available there is also a need for onsite or near site facilities to impregnate inversion liners or facilities to store impregnated liners whilst the pipelines are prepared. This also applies to many of the sprayed application techniques that require high pressure pumps and mixing systems as well as specially designed spray heads. Whilst such liners can provide a long term solution to the problems of many pipelines the circumstances surrounding the installation can be challenging. A new resin lining system by Finland-based Picote could prove to be the answer to these issues. Service life The new resin coating system utilises a specially formulated two-part resin that is applied to the inside wall of the deteriorated pipe using a specially designed brush system, Picote Coating Pump and the Picote MINI MILLER 8/17 which powers the Picote Coating Brushes. Designed specifically for Coating drains and sewers from DN32 to DN150 (1¼" to 6") diameter, the coating applied provides a damp-proof, corrosion resistant, wear- resistant and non-corrosive lining. If several coats are applied within the same pipe the resin will build to create a new a seamless structural pipe with a 2 to 4mm wall thickness (depending on the diameter of the original drain). The estimated service life of the new pipe is between 30 and 50 years. The new low friction inner surface of the lining also permits an increase in the flow inside the pipe thereby minimising the future potential of blockages. The new lining can be applied to concrete and cast iron pipes from DN32 to DN150 and to PVC pipes from DN70 to DN150 (however, it is not recommended for DN32 to DN50 PVC pipes which is expected to carry very hot water). The resin used for the lining has also been developed so as not to produce harmful gases during mixing and a•er hardening. Once hardened the new lining will withstand flow temperatures from -40 to +120°C (with special application this upper temperature can be as high as +200°C). The lining system has also undergone significant testing in Finland and has been Certified by VTT, Finland: Principle VTT SERT R041 trenchless drain renovation method (Certificate No. VTT-C-8552-12 (2613 Water and Sewer equipment The specially-designed Picote Resin Coating Pump with the Picote Mini Miller machine powers the coating system