Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
Session 07A: Operations and Maintenance: Collection Systems
9:45am - 12:00pm
Session Chair: Stephen Lusch, Roseburg Urban Sanitary Authority;
9:45am - 10:30am
Phased Assessment of Sanitary Sewers
Jim Brown1, Chris Helliwell2
1True North Equipment, United States of America; 2Envirosight, LLC; ,
Here you’ll learn about a new workflow; one that will save your department money, help optimize resource utilization, and allow your inspection crews to focus their attention on the sewer assets that need it most.
Sewer inspection is critical to the wellbeing of our wastewater infrastructure, our communities and the environment. Benefits of a well-rounded inspection program include (EPA, April 2010):
Reduced sources of infiltration and inflow (I/I).
Avoided emergency repair costs.
Avoided restoration costs due to environmental and property damage from a catastrophic failure.
Avoided public health costs (i.e., injury, death, disease transmission) from catastrophic failure.
Improved planning and prioritization of rehabilitation.
Improved customer satisfaction and fewer complaints.
These benefits are the goal of every sewer department, but given today’s budgets, a new approach is needed—one that maintains the goal of comprehensive assessment, but which increases productivity and reduces costs.
While CCTV crawler inspection is an essential tool in any condition assessment program, many lines don’t need the level of scrutiny a crawler offers. Rapid assessment tools like zoom cameras and video nozzles are ideal front-line tools for screening out such lines. If municipalities incorporate these tools into a three-phase approach to inspection, they can save significant time and money, and maintain more updated information about pipe condition.
If you are trying to meet increasing demands for infrastructure inspection with the same old workflows and technology, you’re fighting a losing battle. The evolving challenges of sewer inspection require adapting new technologies and methodologies to gain greater efficiencies
and better data. Doing so can allow inspectors to prioritize system-wide which lines need the most attention, and to shorten the interval it takes to perform a complete system assessment.
10:30am - 11:15am
Utilizing Acoustic Inspection Technology to Prioritize Sewer Cleaning
InfoSense, Inc., United States of America;
Reducing sanitary sewer overflows (SSOs) is an important function of maintenance programs - but effectively deploying daily resources to efficiently achieve that objective remains a tricky challenge for wastewater collection system managers. With the introduction of rapid acoustic inspection technology, an increasing number of utilities have started using transmissive acoustics as a preliminary screening tool to quickly determine blockage conditions in small diameter gravity sewer. The acoustic score for each segment ranges from 0 to 10 (0 – blocked, 10 – fully open pipe), and is typically used to help prioritize cleaning and CCTV inspection resources.
With acoustic inspection, utilities can cover 7,000 to 20,000 feet per day with a two-person crew. This method of assessment provides a powerful tool for wastewater collection system managers to quickly gain a low-cost/low-resolution view of blockage condition in their entire system. That being said, acoustics does not replace CCTV or cleaning, but rather prioritizes the deployment of these much more expensive resources towards the pipes that most need it. Results from over 120 million feet of acoustic inspection data show that 65-90% of pipes in most utilities are free of blockage defect. Therefore, rapid acoustic assessment has been a helpful tool in helping utilities to stop cleaning clean pipe and transition to a condition-based maintenance program.
This presentation will utilize case studies to discuss how various utilities have incorporated acoustic technology to improve resource deployment and enhance sewer maintenance operations. The implementation process, resulting cost savings and overall benefits of acoustic technology will be highlighted. Furthermore, limitations of the technology will be reviewed to provide a comprehensive discussion. This presentation will be focused on discussing practical application based on operator training courses performed around the country and will summarize a recently published ASTM Standard developed for acoustic pipe inspection.
11:15am - 12:00pm
Collection System Real-Time Monitoring and Failure Detection
Eric Habermeyer, Kara Peck
Seattle Public Utilities, City of Seattle; ,
Seattle Public Utilities (SPU) owns and operates a collection system that includes 1,420 miles of pipe, 67 wastewater pump stations, 42 combined sewer overflow (CSO) facilities, and 86 CSO outfalls. At any time, system components can fail thereby increasing the risk or cause an overflow to a waterbody, building, street, or other locations. System failures can occur acutely or evolve slowly. Since collection systems typically lack distibuted monitoring equipment, early detection to minimize the impacts of failures can be challenging. One part of SPU’s strategy to detect system failures is to employ real-time monitoring and data trend analysis of equipment operation and flow conditions at facilities and critical areas of the collection system.
Managing a system of real-time flow monitors poses another set of challenges. SCADA sensors, rain gauges, and flow and level monitors are installed in remote locations. Monitoring equipment is often subject to turbulent flow conditions, poor accessibility, or damage from mainline jetting or other maintenance activities. These challenges have led SPU to adopt additional practices to maintain the integrity of the data collection and management system.
This presentation will describe types of flow monitoring used in the collection system, challenges met and practices required to manage an effective monitoring system, and the types of failure that can be detected through data trends of equipment operation and flow conditions. Examples include the early detection of pump and valve clogging, force main breaks, capacity loss in conveyance pipes from root intrusion or sedimentation, and saltwater intrusion. In addition to detecting system failures, real-time flow information has provided the ability to identify opportunities to optimize collection system facilities by changing set points, valve positions, and pumping rates.