Slide Gate Tests, Norfork Dam, North Fork River, Arkansas: Model and Prototype Investigations
Abstract
Results of full-scale tests at Norfork Dam of the two types of slide gates, selected on the basis of model tests, indicated that the performance of a gate with a 45-degree upstream bevel at the lower edge (type B) was superior to that of the Norfork-type gate (type A) which had a flat bottom with a slight slope to fit the sealing surface. High negative pressures on the gate bottom, considerable gate vibration, and crackling sounds characteristic of cavitation were noted for most gate openings of the Norfork gate. By contrast, high positive pressures occurred over the sloping bottom of the 45-degree gate, resulting in elimination of cavitation sounds and in a marked reduction in gate vibration. The high positive pressures also resulted in less air demand at partial gate openings. Tests of long duration at partial gate openings with both test gates revealed some cavitation damages to the outer edge of the bronze seals on both sides of the gate frame and to the cast steel immediately downstream and just under the gate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1954
- Accession Number
- ADA637668