Hydraulic Prototype Tests of Tainter Valve, McNary Lock, Columbia River, Washington.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
Pagination or Media Count:
During initial operation of the 92-ft-maximum-lift McNavy Lock, the air vents just downstream from the reverse-tainter filling valves were capped. Noises resembling thunder or heavy pounding could be heard in the vicinity of the valves when they were partially open. Opening one 12-in. air vent on each valve virtually eliminated these noises. Prototype tests were conducted to determine the cause and effects of the pounding. It was concluded that the most probable cause of the pounding was the sudden relief of low pressures just downstream from the partially open valve by surges of air from the downstream bulkhead slot. These surges and the resulting pounding were eliminated by continuous relief of the low pressures with air from a vent just downstream from the valve.
- Civil Engineering