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Hot curing by means of steam (steam curing) is limited to max. DN 400 and renovation lengths of approx. 150 m. The lining tube, which is set up by pressurized air, is charged with hot steam between approx. 60 °C to 115 °C. The electronic temperature measurements and their documentation are carried out periodically at the start and end manholes and at the intermediate manholes. Measurements are taken at the invert between the lining tube and the host … |
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In the case of UV light curing, the installation pressure, the pulling force and the temperature curves must be continuously measured and documented during the entire curing phase. The proper function of the light technology used must be ensured during the entire process and must be adapted to the respective lining tube product and comply with the specifications of the system manual. The pulling speed and positioning of the UV spots specified by the … |
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The output of UV spots is in the range from 300 W to 4000 W. The UV spots are combined into a chain of lights (UV light chain) according to the required output. Before each curing process, the UV spots must be checked visually and cleaned (e.g. removal of fingerprints, dust, etc.). The perfect overall condition and surface cleanliness of the spots are decisive for its function and thus for proper curing of the lining tube. (Image: UV light curing – … |
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(Image: UV light curing – View of the protective foil (slip sheet)) (Image: UV light curing – Conveyor system for lining tube insertion on a tandem axle trailer) (Image: UV light curing – Winched-in-place insertion of the lining tube with the help of the conveyor system) (Image: UV light curing – Head of the lining tube to be winched-in-place) (Image: UV light curing – View into the excavation pit during the winched-in-place insertion in of the lining … |
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Video: Installation SAERTEX-LINER H20/Pressure/Gas [YouTube] Video: SAERTEX-LINER H20 - Installation in Dresden (PFAFFINGER 2017 EN) [YouTube] (Image: Screenshot Video - Installation Saertex-Liner H20-Pressure-Gas) (Image: Screenshot Video - Installation Saertex-Liner H20 Dresden) |
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A characteristic feature of combined curing or hybrid curing is that during factory impregnation of the tubes, thermo-reactive peroxides (heat curing initiators) are added to the light-curing resins (UV initiators) system. Subsequent cure initiation is exclusively via UV radiation. The exothermic heat generated by UV curing excites the heat-cure initiators. Hybrid curing can be used, if necessary for system reasons, for thick-walled lining tubes … |
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Since conventional UV light curing reaches its limits with very large wall thicknesses of the lining tube (> 7 mm or more depending on the manufacturer), combination or hybrid curing is used here. Here, the ongoing UV light curing activates the thermal curing. Once the UV light has heated the lining tube to approx. 60 °C, the thermoreactive peroxides activate the thermal reaction. Both curing mechanisms lead to the final polymerization of the resin … |
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UV curing of a lining tube for a DN 1750 sewer without the addition of peroxides.
The curing process with all parameters such as pressure, temperature, curing speed and the actual power … |
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(Image: Picto Test) What is to be measured and recorded?
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For the first time after 400 operating hours, the intensity of the UV spots has to be checked against a reference spot with regard to the irradiance of the spot in use (comparative measurement). The reference spot is a calibrated and measured spot. Each spot must then be checked after 150 further operating hours [DWAA143-3:2014]. (Image: UV light curing – UV spot) (Image: UV light curing – UV spots) The comparative measurement is carried out within … |
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Advantages of hot water
Advantages of steam curing
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Nov 01, 2023 News Lianne Ayling Wastewater treatment technology from WCS Environmental Engineering is delivering enhanced ammonia removal at a village treatment works which manages seasonal flows and loads.
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Nov 03, 2023 News Vivien Topalovic KAISER national after sales manager Roger Woods spoke with Trenchless Australasia about the company’s game-changing sewer cleaning vehicles.
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Nov 06, 2023 News Clemence Carayol Since the introduction of the first horizontal directional drill, the Navigator® HDD, through to deployment of the latest in bore planning software, Vermeer Australia has partnered with Australian trenchless specialists to help them deliver infrastructure projects of all sizes for over 30 years.
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Nov 10, 2023 News Vivien Topalovic Adept Civil Group has successfully delivered on a sewer reticulation extension project at the Charlemont Rise estate.
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Nov 13, 2023 News gwf Wasser | Abwasser Saudi Arabia’s visionary city, Neom, is leading the way in sustainable water solutions with the construction of a desalination plant powered entirely by renewable energy.
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Mar 23, 2022 News Amiblu Holding GmbH Austria-based Amiblu produces and supplies customised solutions for sustainable water management worldwide
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Mar 10, 2022 News Gail Gitcho New Clean Tech that Produces Low-Cost Electricity from Slow Moving Water & Wind
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Apr 25, 2022 News The Tribune Untreated industrial and sometimes domestic wastewater usually contains potentially toxic elements in concentrations that are several-fold higher than the maximum permissible limits for irrigation and drinking water. The authorities have so far failed to effectively enforce waste treatment laws, and strict adherence to the norms has remained a daunting task. Proper processing and management will improve food quality and safety as well as human and animal health.
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Nov 23, 2019 AE-02 Open Cut Method: Embedment Zone and Pipe Installation Minimum Trench Width Calculation in the US for Various Pipe Materials The following formula can be used as a general guide to compute the minimum trench width for circular concrete pipe installation using the open cut method. (Image: Reinforced concrete pipe) (Table: Minimum trench width for circular concrete pipe in the US) Sample calculation: O.D. = 24” ID + 3 in wall thickness x 2 = 30 in Total trench width = O.D. + (O.D./6 x2) = 30 in+ (30/6 x 2) = 30 in + 10 in = 40 in min |
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