sewer pipe condition Articles

  • Sedimentation dynamics in combined sewer systems

    Sediments in combined sewers may negatively affect the performance of sewer systems and significantly promote the formation of hydrogen sulfide. To prevent this, German sewer systems are cleaned regularly but at high costs. In order to optimize the cleaning intervals, this study investigates how deposits build up and change over a defined period under constant conditions. The experiments were ...


    By IWA Publishing

  • Manhole Relining in the Keystone State

    Manhole Relining in the Keystone State Mt. Carmel (Pa.) Board of Trustees Turns to Epoxy Lining to Save Failing Structures Exerpts from Trenchless Technology Magazine, September 2005 issue Given that estimates for the total amount of sanitary sewer pipes in the United States top 500,000 miles, it is easy to understand how sometimes manholes can be overlooked. But manholes are a big ...

  • Understanding the spatial formation and accumulation of fats, oils and grease deposits in the sewer collection system

    Sanitary sewer overflows are caused by the accumulation of insoluble calcium salts of fatty acids, which are formed by the reaction between fats, oils and grease (FOG) and calcium found in wastewaters. Different sewer structural configurations (i.e., manholes, pipes, wet wells), which vary spatially, along with other obstructions (roots intrusion) and pipe deformations (pipe sags), may influence ...


    By IWA Publishing

  • Experimental and numerical investigation of interactions between above and below ground drainage systems

    This paper presents the results of the experimental and numerical investigation of interactions between surface flood flow in urban areas and the flow in below ground drainage systems (sewer pipes and manholes). An experimental rig has been set up at the Water Engineering Laboratory at the University of Sheffield. It consists of a full scale gully structure with inlet grating, which connects the ...


    By IWA Publishing

  • Release of hydrogen sulfide in a sewer system under intermittent flow conditions: the Eiceira case study, in Portugal

    The presence and fate of hydrogen sulfide in wastewater systems were studied in two stretches of an intercepting sewer system located in a coastal village, in Portugal. A range of hydraulic parameters were obtained and liquid and gas phase measurements were carried out, both continuously and through intensive sampling campaigns. Upstream, where flow rates were relatively low, dissolved sulfide ...


    By IWA Publishing

  • Sulfide emissions in sewer networks: focus on liquid to gas mass transfer coefficient

    H2S emission dynamics in sewers are conditioned by the mass transfer coefficient at the interface. This work aims at measuring the variation of the mass transfer coefficient with the hydraulic characteristics, with the objective of estimating H2S emission in gravity pipes, and collecting data to establish models independent of the system geometry. The ratio between the H2S and ...


    By IWA Publishing

  • Ghirardelli Chocolate Factory - Case Study

    Sweet Rewards: new composite cutting blade and hydraulic ram enable us to overcome accessibility challenges Challenge Replace corroded cast iron pipes without disrupting a factory’s production line. Solution Our consultant Ben Patterson found water standing under the plant’s cleanout grilles. A ...


    By Tric Tools, Inc.

  • What`s in the numbers? a review and analysis of more than 400 miles of force main inspection and condition assessment data

    Abstract Comprehensive condition assessment of wastewater force mains provides significant challenges to owners/operators of collection systems as the ability to shut down or expose the pipeline for a thorough inspection is often impractical due to operational and/or financial considerations. Traditional gravity sewer inspection techniques (i.e. visual-based technologies) do not always ...

  • Comparing the utility of decision trees and support vector machines when planning inspections of linear sewer infrastructure

    Closed-circuit television inspection technology is traditionally used to identify aging sewer pipes requiring rehabilitation. While these inspections provide essential information on the condition of pipes hidden from day-to-day view, they are expensive and often limited to small portions of an entire sewer system. Municipalities may benefit from utilizing predictive analytics to leverage ...


    By IWA Publishing

  • Research of the performance of pulse electrohydrodynamics in blockage removal

    In line with contemporary trends and seeking to develop new methods and technologies, a new, original technology was explored and designed based on a non-conventional process of electrical pulse discharge in a water chamber, referred to as ‘Pulse Electrohydrodynamic Technology’ (PELHYDT). The application of the PELHYDT in sewer blockage removal is presented in this paper. Existing machinery can ...


    By IWA Publishing

  • Reclaimed wastewater quality enhancement by oxygen injection during transportation

    In-sewer treatments have been studied in sewer systems, but few have been carried out on reclaimed wastewater systems. A study of oxygen injection has been performed in a completely filled gravity pipe, 0.6 m in diameter and 62 km long, in cast iron with concrete inside coating, which is part of the reclaimed wastewater reuse scheme of Tenerife (Spain). A high pressure oxygen injection system was ...


    By IWA Publishing

  • SWater`s Pills

    In an urban/industrial wastewater treatment plant is not always possible to evaluate  the pollutant load, through surveys and direct measurements in situ (usually expensive) of the scale and the relative concentrations of pollutants. In the case of indirect evaluation, the hydraulic load in the sewer or the flow of wastewater to drain and to convey to a treatment plant, is estimated from the ...

  • Case study - Muskegon County - Sewer Force Mains

    Service: Sahara Client: Muskegon County Type of Pipeline: Sewer Force Main Diameter: 66-inch Pipe Material: PCCP Length: 8.5 miles 13.7 km In 2007, Muskegon County’s 35-year old large diameter wastewater force main failed catastrophically. Although historical data demonstrated that joint leakage had never contributed to previous events, extensive failure analysis of ...

  • Case study - City of Sault Ste. Marie - Pressure Monitoring

    The condition assessment project consisted of a Sahara pipeline inspection to detect any leaks or pockets of trapped gas on the lines, as well as a period of pressure transient monitoring on each pipeline to check for any sudden peaks or drops in the pressures which could be damaging to the lines. Service: Sahara Transient Pressure Monitoring Client: City of Sault Ste. Marie Type of ...

  • Relining with corrugated steel pipe, Mississauga, ON

    Owner: Ministry of Transportation, Ontario Consultant: Morrison Hershfield Contractor: Underground Services Limited Location: Mississauga, Ontario With over 320,000 vehicles per day the intersection of Highways 401, 403 and 410 in Mississauga, Ontario, is one of the busiest in North America. At the same location can be ...


    By Armtec

  • A new methodology for the optimal design of series of pipes in sewer systems

    The sewer network design problem consists of determining both the layout and the hydraulic design of the system. This paper aims to find an optimal hydraulic design for a specific layout consisting of a series of pipes. An optimal hydraulic design of a series of pipes is that which satisfies all the hydraulic, commercial, and construction constraints, while minimizing the construction costs. ...


    By IWA Publishing

  • Sewer-Main Collection Pipe Joint Infiltration Testing and Life Cycle Cost Analysis

    ABSTRACTResearch ProjectsMajor members of the sewer-main pipe manufacturing industry and the University of Houston have completed and published the results of the following two research projects: The Sewer-Main Collection Pipe Joint Infiltration Testing research project that measured the water infiltration rate of water-tight designed 30-inch pipe joints. The joint tightness testing was ...

  • Installation of Large Diameter Buried Pipes

    The ProblemThere is an ongoing need to provide designers, specifiers, engineers, consultants and students an overview and general understanding on the proper installation and rehabilitation of buried municipal and industrial pipelines to provide a long-lasting wastewater and potable water infrastructure that will serve future generations. Goals and ObjectiveMost buried ...

  • An approximate solution for two-dimensional groundwater infiltration in sewer systems

    Estimating groundwater infiltration into sewer systems is important for wastewater treatment operators and municipalities. This paper presents an approximate solution for steady-state groundwater infiltration into sewer systems through line defects. The groundwater table was assumed to be horizontal and the aquifer homogeneous and isotropic. Mobius transformation technique and equivalent ...


    By IWA Publishing

  • Drain Cleaning Does Not Require Digging Anymore

    The professionals at Lake Norman Septic use cable snakes and other tools to locate your septic issue and unclog any drains and pipes. Before these techniques existed a septic tank issue often meant intensive digging and weeks of messy yard waste. The new cable snakes use tiny cameras than can easily squeeze through your sewer and septic ...


    By Lake Norman Sewer & Septic

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