On the importance of valve modelling, reflected pressures, and wall friction, in cathena water hammer simulations PDF Download

Author: T. G. Beuthe
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description

Author: Bruce Sharp
Publisher: Elsevier
ISBN: 0080543677
Category : Technology & Engineering
Languages : en
Pages : 187

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Book Description
Water hammer, or the study of fluid transient behaviour, is one of the most common problems in the water engineering community. This book covers the many causes and solutions in a practical way and is an essential reference for all those concerned with the flow of liquids, not just water, in pipe systems. It follows on from the authors' previous monograph on the problems and solutions of water hammer and presents common problems in the form of case studies.This is an interesting and useful read for practising engineers working in this area and it will enable them to make comparisons with their own problems. Also the practical nature of the book makes it useful for civil engineering departmental libraries and departments where hydraulic design is taught.

Author: J. Záruba
Publisher: Elsevier
ISBN: 0080870341
Category : Technology & Engineering
Languages : en
Pages : 363

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Book Description
The physical principles of water hammer are explained in this volume. The basic mathematical methods of solution of water hammer and ways of limiting its effects are covered. Detailed description is given of the method of characteristics and the corresponding programs for personal computers, which enables solution of water hammer in a wide variety of hydraulic systems encountered in practice. Examples are given of solution of water hammer of common pipe-line systems as well as calculation of the steady state of flow, the determination of discharge through a pipe-line, measurements of characteristics of valves, pumps, turbines, determination of the operating régime of a valve in order to ensure a desired pressure and discharge curve, etc. This book will be of interest to those civil, mechanical and petroleum engineers dealing with the design and operation of hydraulic systems.

Author: S. Mambretti
Publisher: WIT Press
ISBN: 1845646800
Category : Technology & Engineering
Languages : en
Pages : 201

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Book Description
Water Hammer Simulations is a comprehensive guide to modelling transients in closed pipes. The models presented range from those used for the first studies into the field to the most advanced available today. All of the models are described in detail, starting from the simplest to the most complex. Most of the presented models have been implemented in computer codes, which are provided with the book as both executable files and the sources. The use of these programs is explained in the book where they are applied in a number of examples; the results are critically commented, to allow the reader to be able to build an appropriate model for their own use. Suggestions on the most appropriate model to be built and used are provided throughout the book. Laboratory tests and real case applications are also presented and discussed, together with the still unresolved problems in the field. The focus of researcher’s efforts we will be on these issues in the coming years. The book is suitable for professionals working in the field as well as scholars and undergraduate students.

Author: Lorenzo Allievi
Publisher:
ISBN:
Category : Hydraulics
Languages : en
Pages : 250

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Book Description

Author: Arnold Hartley Gibson
Publisher:
ISBN:
Category : Hydraulics
Languages : en
Pages : 78

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Book Description

Author: Blake Ragsdale Vanleer
Publisher:
ISBN:
Category : Water hammer
Languages : en
Pages : 188

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Book Description

Author: Wissam Al-Taliby
Publisher:
ISBN:
Category :
Languages : en
Pages : 762

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Book Description
The major impact of water hammer on force mains integrity include excessive pressure oscillation that is usually accompanied by pipe vibrations. Models for simulating force main water hammer response have been developed. All of these models were based on the method of characteristics (MOC) and most of them were not calibrated for the lack of efficient field data. Although predicting maximum pressure during the first wave cycle is sufficient in most applications, some applications require precise prediction of pressure damping. One-dimensional models usually over predict pressure oscillation beyond the first cycle since they are based on steady friction expressions. It is also not well understood how pipes vibrate during water hammer events. The objectives were to: i) predict transient pressure of a force main system by a water hammer model based on the wave characteristics method (WCM) using Surge 2012 software and that model would be calibrated, validated and then used to perform surge analysis, ii) apply a one-dimensional water hammer model to predict surge pressure beyond the first cycle, and iii) determine the vibration characteristics of a pipeline subjected to water hammer conditions induced by rapid valve closure. A data acquisition system coded by LabVIEW software was built to collect field data. The WCM-based Surge 2012 software was used to model the South Beaches Force Main Sewer System (SBFSS). The model was calibrated, validated, and used to conduct surge analysis. An experimental small scale pipeline system was built. Valve closure experiments at different pipe material types, lengths, flowrates, and closure speeds were conducted and the induced transient pressure and acceleration were measured. The pipeline was modeled using Surge 2012 and a sensitivity analysis was conducted to determine the parameters affecting damping of pressure waves. The SBFSS model predicted field pressure during steady and transient states. Existing surge control devices were predicted to be sufficient to protect the pipeline under the worst case operational scenario. Sensitivity analysis determined the parameters that affect the sufficiency of a one-dimensional model to address the pressure damping issue. Water hammer-induced vibration was found to occur simultaneously with and correlate to surge pressure rise for different pipe materials. A pipe with lower modulus of elasticity was found to vibrate with higher amplitude and lower frequency than one with lower modulus of elasticity under the same conditions. Reducing pipe length for the same material type resulted in lower surge pressures and vibration levels but higher frequency.

Author: Lorenzo Allievi
Publisher:
ISBN:
Category : Hydraulics
Languages : en
Pages : 254

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Book Description

Author: Kaveh Hariri Asli
Publisher: CRC Press
ISBN: 1466568879
Category : Science
Languages : en
Pages : 274

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Book Description
This book provides a broad understanding of the main computational techniques used for water hammer research in water systems. The theoretical background to a number of techniques is introduced, and general data analysis techniques and examining the application of techniques in an industrial setting, including current practices and current research