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Session 12B: Collection & Conveyance - Pumping Systems
10:30am - 12:00pm
10:30am - 11:15am ID: 152 / Session 12B: 1 Main Technical Program Topics: Wastewater 101, Collection and Conveyance Keywords: surge, transient pressure, pumping, transmission
Decoding Water Hammer: Comparing Real Measurements With Modeling Predictions
Brown and Caldwell, United States of America;
Transient pressures can cause significant damage to force mains and pumping systems, leading to pump station down-time, sewage overflows or water loss, and costly repairs. Numerical modeling can help address the issue, but results can be difficult to understand or implement correctly. This presentation will use three case studies to explain water hammer and how numerical modeling helps to avoid problems with transient pressures in pumping and pipeline systems.
In the first case, an existing sewage force main experienced pressure damage. After monitoring data confirmed hydraulic transient presence, numerical modeling identified that installing a surge tank at the pump station would be the most effective mitigation strategy. Following the installation of the tank, field measurements closely agreed with pressures predicted by the modeling.
In the second case, monitoring equipment detected transient pressures during the startup of a new pump station. Using field measurements to calibrate a numerical model of the system, the team determined that the addition of flywheels on the pumps would address the issue. Field measurements closely agreed with pressures predicted by the modeling following the flywheel installations.
In the third case, a numerical modeling study performed during design led to a recommendation to install surge tanks at the pump station. Transient pressure measurements obtained during pump station startup closely agreed with those predicted in the numerical modeling study.
This presentation will detail the convincing evidence that transient pressure numerical modeling is a critical step for developing resilient force main and pumping system designs. Numerical modeling provides reliable data for developing a surge mitigation strategy and reliably assess when a surge mitigation strategy is successful.
Brief Biography and/or Qualifications Brandon Billing is a lead hydraulic modeling engineer at Brown and Caldwell. He has been using hydraulic modeling tools to evaluate water and wastewater conveyance engineering problems for over 13 years, specializing in hydraulic and hydrologic modeling and surge analysis. He is a leader in Brown and Caldwell’s (BC) national Surge Analysis group, which implements best practices and quality control for surge modeling, analysis, and mitigation. He enjoys any opportunity to shed some light into the dark and mysterious world of hydraulic transients.
11:15am - 12:15pm ID: 182 / Session 12B: 2 Main Technical Program Topics: Collection and Conveyance Keywords: pump stations, diversion structures, conveyance
Challenges and Opportunities Presented by Diversion Pump Stations
Mike Carr1, Frank Dick2, Jeff Hart3
1Murraysmith, United States of America; 2City of Vancouver, WA; 3Clean Water Services; , ,
When sewer trunk systems reach capacity, agencies occasionally elect to install a pump station to pump past the bottlenecks rather than upsize the line or build a parallel pipe. This is typically due to the higher capital expense of a trunk sewer caused by environmental mitigation requirements, pipe depth, and traffic disruptions. On the upside, constructing a diversion pump station can often be the more expedient way to meet upstream development demands or reduce risk of overflows. Conversely, a diversion pump station also provides new challenges for Operations through increased maintenance time and cost. However, the facility can also offer flexibility to an agency’s overall operations, providing opportunities to address operational concerns elsewhere in the system through automation, flow control, and redirection of flow to underutilized infrastructure in the conveyance and treatment facilities.
This presentation will provide two recent case studies in diversion pumping: the City of Vancouver’s Burnt Bridge Creek Pump Station, a 7-mgd diversion pump station that was mothballed 20 years ago because of maintenance-related issues; and Clean Water Services’ Dawson Pump Station, a 20-mgd facility built to increase conveyance capacity for supporting industrial growth, hampered by constituents in the industrial wastewater. Discussion will include the projects’ origins, the operational issues encountered along the way, the solutions engineered to optimize the facility’s operation, and the opportunities to use the diversion to further improve overall conveyance system performance and reliability.
Brief Biography and/or Qualifications Mike Carr, PE, Murraysmith, Principal Engineer
Mike is a project manager primarily focused on leading water and wastewater pumping and conveyance projects in the region. Mike serves as Group Manager of Murraysmith’s Water/Wastewater Pumping team for Oregon & Southwest Washington. He has over 27 years of experience as a consulting engineer for local agency clients throughout the Pacific Northwest.
Frank Dick, PE, Wastewater Engineering Supervisor, City of Vancouver
For 14 years, Frank has overseen sewer and wastewater engineering functions, including capital projects, wastewater system planning, interface with the City’s contract operator for wastewater, and the city’s industrial pretreatment program. Previously, Frank served in facilities and environmental engineering functions at semiconductor facilities in the Portland-Vancouver area.
Jeff Hart, PE - Pump Station and Natural Treatment System Engineer, Clean Water Services
Jeff oversees and manages the District’s pump station capital improvement program and performs engineering for their Fernhill Natural Treatment System, where he previously was design engineer as a consultant. Jeff is the President of the Lower Columbia Section for the PNCWA and is heavily involved in the planning of the annual Oregon Water Education Foundation Water Environment School.