Hydro Intake Stoplogs & Hoist System Design
This facility has two 14-foot diameter intakes that combine into a 3.5-mile-long flowline just downstream of the dam; the south intake has a permanent bulkhead installed and is not utilized. The original wooden stoplogs installed in 1926 are still used at the north intake to dewater the penstock and intake gate area. Given their age, these stoplogs were nearing the end of their service life. Additionally, the original process for installing and removing the stoplogs is inefficient and requires divers to guide the stoplogs into place. The goal of the project was to design new stoplogs and a new lifting system to replace the current stoplogs and to improve the functionality of the outdated system.
To identify a more efficient and economically feasible solution, Bergmann provided the following services:
- Observation of existing conditions
- Assessment of existing stoplogs, lifting system and operations
- Recommendations for a stoplog lifting system (i.e., monorail, hoist, supporting structure, follower/lifting beam with an automatic latching mechanism)
- Research and assessment of options and recommendations for new stoplogs
- Recommendations for electrical modifications and festoon system
- Engineering and design to prepare Issue for construction drawings and specifications for the recommendations
