Pressure utilization in water transmission pipelines considering transient conditions

W. E. Elshorbagy, M. S. Al Maamari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The residual pressure energy available in water transmission pipelines can be easily utilized via direct connection to the distribution system and bypassing the storage reservoirs and booster pumping stations. This study investigates the feasibility of bypassing a number of reservoirs and pumping stations in a small transmission system in AlAin City of United Arab Emirates. The system has a major transmission pumping station (AlAin Reception Pumping Station, or 'AARS') that hosts four fixed-speed pumps, a main 1200mm line, storage reservoirs and boosting pumps at three zones (Dahma, Markhania and Maqam), besides few other connection pipes. The system also has three surge vessels and air valves. The objective of the study has been achieved by conducting a comprehensive transient analysis to evaluate the potential of pressure rises associated with various operating scenarios. Such scenarios were divided into normal and abnormal operating conditions. The normal operating conditions are related to the typical water supply changes occurring during any typical day. The abnormal operating conditions represent rare and odd operating scenarios such as sudden valve closures/openings and pump trips. Limiting pressure heads of 160 m for the pipe pressure rating and 60 m for the pump shutoff head were considered to identify safe performance of the proposed bypass setting. British Standards (BS), International Standard Organization (ISO) and Abu Dhabi Water and Electricity Authority (ADWEA) Standards were adapted for the design of pipes and fittings. Simulation results associated with the normal operating conditions indicated that the proposed setting is safely performing in such conditions and has yielded safe closure times for different valves. Results of the abnormal operating conditions indicated unsafe performance in the case of sudden valve closures. To protect the system against severe transient pressures under these conditions, a number of pressure-relief valves were proposed to be installed on the upstream side of the distribution network. The proposed valves were sized and evaluated when the system pressure is maintained below 100 m. The savings in energy cost associated with the proposed bypass setting is estimated at about $850,000 per year. Such savings are found to be available after a payback period of one year and one month to cover the capital cost of the needed bypasses and pressure relief valves.

Original languageEnglish
Title of host publicationWater Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010
Pages154-173
Number of pages20
DOIs
Publication statusPublished - Jan 30 2012
Event12th Annual International Conference on Water Distribution Systems Analysis 2010, WDSA 2010 - Tucson, AZ, United States
Duration: Sep 12 2010Sep 15 2010

Publication series

NameWater Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010

Other

Other12th Annual International Conference on Water Distribution Systems Analysis 2010, WDSA 2010
Country/TerritoryUnited States
CityTucson, AZ
Period9/12/109/15/10

Keywords

  • AlAin
  • United Arab Emirates
  • Water distribution system
  • bypass
  • energy saving
  • transient
  • transmission

ASJC Scopus subject areas

  • Water Science and Technology

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