METHODOLOGY
Two 18” vertical turbine pumps were installed into an existing junction structure. A slide gate was utilized to block downstream flow, where the vertical turbines picked up the flow and bypassed it 13,500’. Midway on the bypass route, a booster pump station, which consisted of two 24” GHT pumps, was installed in case of high level events, such as thunderstorms. We proposed this method because of the flow required, the depth of the suction point, and the discharge distance. Due to the length of the project and also as a cost savings, electric drive trash submersibles were also utilized.
Variable Frequency Drives (VFD) were programmed to receive level data from transducers and automatically control the pump speed based on incoming flow. We also utilized the Global Messenger system to monitor levels and to control the pumps. Our teams performed regular, scheduled service and inspections to ensure our customer was satisfied.
CHALLENGES
The bypass route was installed through heavy traffic areas, requiring traffic control and night operations. During the main bypass, we experienced four high-level events, where our system was able to provide more flow capacity than what was required by the project specifications or quotation. The bypass duration has been extended six months, and is currently on time and on budget.
PROJECT CONTACT
Insituform
708-326-5028
PROJECT VALUE
$2.5 Million
