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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) The new pipe is fed through a support bracket, located at the top edge of the insertion pit, into the old host pipe with sufficient clearance (due to the expansion). In general, it is recommended to shorten the insertion pit by using additional roller supports, at a distance I3 from the edge of the trench, to increase the clearance Δh3 [mm] above ground level. Equation 10: (Formula: minlG) For PE pipes (SDR 33, 26, 21 and 17) without additional support (… |
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May 12, 2020 AE-08 Replacement: Pulling-In the Pipe String during the Pipe Bursting Process NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) The minimum insertion pit dimensions are determined using the following parameters [DWA-A 143-2]:
(Image: Pipeline and insertion pit parameters (sufficient overcut … |
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) Basis for the calculation model The required insertion pit length lG is determined for an unrestrained pipe, i.e., freely stored at the top edge of the pit, insertion with clearance between expansion and the new pipe (i.e. Ᾱ1 = 0). lGresults from the following conditions:
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) Interpolation between the curves is allowed. Input values: (Formula: minlG) (→ Table: Equation variables) of mathematical variables (Image: Diagram for the required pit length lG for PE pipes SDR 21 (SN 8) during the insertion into the old pipeline (clearance Δh / dL,a)) |
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) Below are the diagrams for determining the pit length for PE pipes (SDR 33, 26, 21 and 17). (Image: Required insertion pit length lG for PE pipes SDR 33 (SN 2) pulled into a host pipe (clearance Δh / dL,a) [DWA-M 143-2 draft]) (Image: Required insertion pit length lG for PE pipes SDR 26 (SN 4) pulled into a host pipe (clearance Δh / dL,a) [DWA-M 143-2 draft]) (Image: Required insertion pit length lG for PE pipes SDR 21 (SN 8) pulled into a host pipe (… |
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) If the insertion pit is excavated along its entire length, pipes can be pulled in two directions. (Image: Insertion pit for the pulling in of two pipelines) |
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) The maximum strain of σ = 21 N/mm2 (Short Term) applies to PE pipes before buckling damage occurs, which is limited to (γ = 1.4) max σ ≅ 15 N/mm2 during installation. This strain includes the short-term modulus Eσ=15 = 500 N/mm2 and the elongation max ε = 3 % (DVS 2205-1 guideline). In order to prevent pipe buckling during the pulling in procedure, the radius of curvature is to be determined as per equation 11: Equation 11: (Formula: Krümmungsradius … |
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May 12, 2020 AE-08 Replacement: Pulling-In the Pipe String during the Pipe Bursting Process NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) To the max. RKbelongs the maximum allowable strain εK, with: Equation 12: (Formula: die maximal zulässige Dehnung εK) Due to the buckling danger, the strain max σKmust be reduced accordingly (see table on the next page). The associated modulus of elasticity can be approximated by interpolation: Equation 13: (Formula: E-Modul) (Table: Equation variables) |
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May 12, 2020 AE-08 Replacement: Pulling-In the Pipe String during the Pipe Bursting Process NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) In addition, the variability of stresses and thus the effective modulus of elasticity Em [N/mm2] of the pipe over the pit length lG , and the pipe diameter are taken into account as follows: Equation 14: (Formula: E Modul Em N mm2) (Formula: a von EModul Em Gleichung) If the pulling in of the pipeline takes place in temperatures other than 70 °F (20 ° C), the pit length can be corrected as follows: Equation 15: (Formula: Ermittlung des maximalen … |
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May 12, 2020 AE-08 Replacement: Pulling-In the Pipe String during the Pipe Bursting Process NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) With a longer interruption of the insertion process, the pipe in the insertion pit must be secured so that the maximum allowable bending radii (radii of curvature) are not exceeded. |
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May 12, 2020 NA-08 - Replacement: Pulling-In the Pipe String during the Pipe Bursting Process (Demo) Congratulations! You have successfully finished this module. Next you will have the opportunity to review the newly acquired knowledge with an interactive questionnaire. You can still navigate back to any point in the lessons if you wish to review a specific point or subject. Stay curious! |
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May 12, 2020 This module focuses on the parameters that must be considered when pulling in the pipe string for gas, water and wastewater pipelines. In addition to a basic description of the replacement procedure, the importance of tensile forces, bending radii, and the dimensioning of the excavation pit is therefore the focus of attention. After completing this module, you will have a sound knowledge of:
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Feb 01, 2021 News Louise Elliott The impact of emerging contaminants, and in particular polyfluoroalkyl substances (PFAS’), on watercourses and public health was the theme of the latest Water Action Platform webinar, which took place on 21 January 2021.
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Feb 02, 2021 News Kathryn Langley Global leak detection specialist Ovarro is continuing its period of transformation and growth and has appointed Tony Gwynne as UK sales director.
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Feb 09, 2021 News Karen Cotton In the first eight months since acquiring the City of Rosiclare water production system and wastewater system, Illinois American Water has invested approximately $1.1 million in upgrades. These projects are part of the company’s commitment to invest $5 million in the first five years of ownership.
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Feb 12, 2021 News Envirosight Are your current efforts to address I&I successful? Or are you spending resources without much return? Mitigating the issue can feel like an uphill battle when the wrong approach is taken.
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Mar 24, 2023 News Stefan Gerhardt Every year on 22 March, World Water Day reminds us of the importance of one of the most important resources of life. Almost two-thirds of our planet is covered with water, but not even three percent is drinkable freshwater. Every day, large quantities of chemicals enter our waters and endanger the health of humans, animals and plants. In addition to pesticides, for example, drug residues also pollute our drinking water. The Leibniz Institute for Plasma Science and Technology (INP) has developed technical solutions to clean wastewater of such pollutants.
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Oct 27, 2022 News Carly Perry Innovation accelerator Spring launches new water competition, Condition monitoring solutions sought from range of industries, Chance to pitch to and collaborate with multiple water companies
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Oct 31, 2022 News Trenchless Australasia German-based IMS Robotics has partnered with KRE Engineering and UVR Hire to enter the Australian and New Zealand trenchless markets.
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Nov 02, 2022 News Luca Guillaumot Against the backdrop of climate change and rising water demand, tools for adequately modeling water availability are much needed. In a new study, researchers applied a large-scale model linking surface water to groundwater, which can be used for estimating water resources at a high spatial resolution.
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Nov 04, 2022 News Ludo Debever The Construction 2050 Alliance hosted a public event on Sustainable Finance and the impact of the EU taxonomy on the construction sector.
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Aug 05, 2024 News Franziska Betz India’s fast-growing cities need an efficient infrastructure for water supply and wastewater disposal. A research cooperation, is therefore supporting the development of a sustainable water infrastructure in the southern Indian city of Coimbatore with the “AQUA Hub” project. At the center of this is a contact point for German-Indian technology and knowledge transfer, the so-called Water Innovation Hub.
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Nov 21, 2022 News Trenchless Australasia New Zealand: Watercare is set to begin laying down the foundations for a new $20 million wastewater pipe network to reduce wastewater overflows and cater for growth in Rosedale and its surrounding suburbs.
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Jul 19, 2021 News Candida Heinrich-Piras TELEREP rehabilitates 38-metre-long downpipe on a multi-storey apartment building within two hours in the middle of Paris. Magnificent view of the Eiffel Tower during the installation of the BRAWOLINER® HT DN 100.
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Jul 20, 2021 News Eva Ori Major technical and business advances will be announced at the International Plastic Pipes XX Conference and Exhibition. These developments are previewed by the provisional program of papers for the conference that will be held September 6 – 8, 2021 at the Okura Hotel in Amsterdam.
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