Analyses and Field Tests for Hydraulic Transients Sultan Hydroelectric Project

by F. A. Locher, Bechtel Civil & Minerals Inc, San Francisco, CA, USA,
C. Liang Lee, Bechtel Civil & Minerals Inc, San Francisco, CA, USA,

Document Type: Proceeding Paper

Part of: Waterpower '85


Two in-line Francis units with their long discharge conduit and bypass valves present some unique problems in controlling hydraulic transients in this system. The problems were compounded further by the fact that there was no feasible location for a surge tank either upstream or downstream from the units. A combination of surge protection devices including air valves and a rupture disk together with operational constraints were developed to reduce the transient pressures to acceptable levels. The hydraulic analyses used in the final design and the field tests conducted to verify the hydraulic performance of the system are the subject of this paper. Problems associated with lost motion in the mechanical linkage between the Francis units and their bypass valves are also discussed.

Subject Headings: Field tests | Hydraulic design | Hydraulic transients | Transient response | Hydro power | Rivers and streams | Valves | Construction management

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