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Stuttgart Mühlhausen, Germany

For the new drinking water pipeline "Laichinger Alb" of the Landeswasserversorgung, which connects the south western supply area with the main pipe system of the Landeswasserversorgung, a surge protection device with a pressure tank and two serial vortex chambers for damping have been selected. The article describes design and dimensioning as well as computer simulation results and the real hydraulic behavior of the system gained by experimental investigations. It has been shown, that the surge protection device meets all needs. The results by computer simulation have been exactly enough for predesigning, but a further improvement of accuracy still remains desirable. Need for further research activities exist when considering the parameters having inluence on the polytropic exponent for describing the change of state the compressed air within the pressure tank.

The water supply company Landeswasserversorgung in Stuttgart, Germany, supplies drinking water to around 250 cities and towns in Baden-Württemberg and Bavaria. The long-distance pipelines cover great height differences and long reaches, so energy efficiency is for pumping and energy recovery by drinking water turbines and best practice for operation of great importance. This article introduces into considerations for optimizing operation as well as aspects for replacing aggregates of pumping systems. Furthermore, the optimum operation and dimensioning of drinking water turbines are explained. At the end is shown, how these measures improve the energy balance of the Landeswasserversorgung.

Haakh F.,Zweckverband Landeswasserversorgung
GWF, Wasser - Abwasser | Year: 2015

Vortex-throttle devices show a characteristic asymmetric throttle behavior and are proved for dampening water-mass oscillations in pipe-systems caused by transient effects. This paper shows how to compute the velocity profile of the vortex flow. New is the approach to estimate the polar moment of inertia from the kinetic energy of the vortex flow. Based on this, the differential equation describing transient flow within the system vortex-trottle-pipe is derived. The Comparison of numerous measured with computed data shows, that the developed solution describes the transient effects within the system vortex-throttle-pipe as well as for step responses as for variable energy head quite well.

Concerning the maintenance and repair of drinking water pipelines the question whether it's more economical to repair in each particular case of a pipe damage or to start a completely overhaul of the entire pipeline is essential. The occurrence of pipe damage can be represented as a stochastic parameter depending on age and location. A computational model is applied to this data which enables the variation of the length of the stretch of pipe beeing replaced in case of pipe damage. The computational method is fine-tuned with the help of the option of varying the interest and price increases and in this way specifying different variations in both the cash value and remaining useful life. Using a sample case proves that there is an economic optimum between repairing and renewing. The article describes the methodology in an easy-to-follow way. © Messe Berlin.

The technical safety management has been introduced ten years ago in August 2000 by DVGW. Some water supply companies which have passed the certification procedure early after its implementation have already passed the first reaudit, which is due every five years. The Landeswasserversorgung has met the requirements of certification and has excellently fulfilled the review requirements in 2009. In this article a report is given about the experiences with setting up and maintaining the technical safety management, about the certification procedure and the certification preparations. Another issue of this article is the process of composing and using the operation manual.

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