The slope of sewer pipes is a major factor for transporting sewage at designed flow rates. However, the gradient inside pipe changes locally various reasons after construction. This causes disturbances requiring investigation and appropriate maintenance. study extracted internal elevation fluctuation from closed-circuit television footage, which required sanitary sewers. principle that change i...

Tire-derived aggregate (TDA) has been proposed in recent studies to be considered as part of backfill soil reduce stress and strain developed buried pipes. However, little attention is paid checking the influence TDA on behavior concrete pipes under trafficked roads. This research this topic using a verified numerical model that considers three-dimensional nature traffic load effects. Different...

Localized biogenic corrosion and extrication of annoying odors caused by hydrogen sulfide (H2S) have long been a big problem in the management urban sewer systems. H2S emission control sewers via chemically or biologically normal oxidation processes has also investigated extensively is costly. The objective this work was to develop new technology mitigate concentration pipes using conductive co...

Reprocessing cells of nuclear plants are constituted by a great number of specular metallic pipes. When they are illuminated, this kind of pipes generates areas of high light intensity, called highlights. The latter can produce erroneous results, especially in edge detection. The matter of this paper is to suppress and further to exploit the highlight effects. With this aim in view, we propose ...

Pollutants discharged from stormwater pipes can cause water quality and ecosystem problems in coastal bayous. A study was conducted to characterize sediment and nutrients discharged by small and large (< 20 cm and >20 cm in internal diameters, respectively) pipes under different rainfall intensities (< 2.54 cm and > 2.54 cm, respectively). Results showed that large pipes had greater discharge t...

Recently many plants' pipes and drains became old and many robots to inspect these pipes were developed in the past. Wired robots were put to practical use, but they had a heavy power supply and a signal wire. Therefore, new inspection robots using wireless radio communication system are considered useful for long complex pipes and long distance pipes including straight, vertical and bend line....

We discuss a reaction–diffusion system modeling concrete corrosion in sewer pipes. The system is coupled, semi-linear, and partially dissipative. It is defined on a locally-periodic perforated domain with nonlinear Robin-type boundary conditions at water-air and solid-water interfaces. We apply asymptotic homogenization techniques to obtain upscaled reaction–diffusion models together with expli...

This paper addresses the problem of navigation of an autonomous robot when it moves in a modern concrete sewer. The robot must keep its orientation within mostly cylindrical sewer pipes. This implies a geometrical constraint on the environment in which the robot operates. We present a hybrid vision system that consists of (a) an optical camera and (b) a laser crosshair projector generating a cr...

A buried pipeline can buckle upwards if there is not enough resistance to movement. Both the uplift resistance (the maximum force per unit length) and the mobilisaion distance (the distance the pipeline has move before the maximum force is reached) are important in design. Tests on pipes in several soils were carried out at 1 g at full scale and in a centrifuge at 10 g and 1/10 scale. A compari...

This paper examines the thermal resistances of energy piles and surrounding soils. A field-scale bored pile was installed through stiff sandy clay dense sand instrumented to measure temperatures on external walls heat exchanger pipes, at pile-soil interface, in soil. The radial temperature gradients between pipes interface soil, were used evaluate soil resistances, respectively. same order magn...