Water Journal : Water Journal March 2011
water MARCH 2011 109 valves and measurement instruments and the respective jointing technologies, as well as tailor-made solutions for any application in which fluids or gases are conveyed, whether for mining, industrial, chemical, water or utilities applications. For more information contact Georg Fischer Piping Systems on: 1300 130 149, or email: firstname.lastname@example.org. KROHNE HELPS WWTP ACCURATELY MEASURE FLOW Some people look at a glass as half-full, while some look at it as half-empty -- but if a pipe in a wastewater treatment plant is only 50 per cent filled, it doesn't matter which you call it; when it comes to measuring the liquid in that pipe, either presents a problem. The dilemma comes down to one thing: few instruments can accurately measure the level of flow in a pipe that is half full or less. Back River Wastewater Treatment Plant in Baltimore, US experienced just such a problem. "We had a process in the plant that had been shut down for quite a while, and when we restarted it, we had problems taking the measurement in that pipe," said instrumentation supervisor, Primnath Rambissoon. "It was an application where the flow rate was very low and the pipe wasn't completely full. Unfortunately, the flowmeter we were using was unable to measure flow when it was that low." Specifically, the trouble area was a section of piping that served as part of the plant's sludge handling process, transferring liquid from one section of the plant to another. The root cause was that the 12-inch pipe was oversized for the amount of material running through it: plant management had previously attempted to remedy the situation by installing a reducer to reduce the pipe from 12 inches to 8 inches, but that still wasn't enough to make the existing flowmeter work. Essentially, where the water originated at the entry point of the plant was a full pipe and the meter there could handle the flow rate. But plant personnel were unsuccessful in trying to correlate that flow with what was coming from the other side of the plant. When Rambissoon learned Krohne Inc had a unique product capable of measuring flow in partially filled pipes, he was intrigued, and after a demonstration he bought the Krohne Tidalflux Electromagnetic Flowmeter. The Tidalflux, which is ideally suited for use in partially filled pipelines, is installed mainly in the intake and outfall structures of sewage works and stormwater basin outlets, as well as in transfer stations. The measuring system is similar to that of a conventional electromagnetic flowmeter with two measuring electrodes, supplemented by a capacitive level measuring system which measures the filling level in the primary head with millimeter accuracy, regardless of whether the pipe is flowing full, half-full or even less. As the two measuring electrodes are located below the 10 per cent filling level, the flowmeter is immune to any residues floating on the water surface and is not affected by flow profile or wave motion. The capacitive level measuring system is supported on large-area sensors that are embedded in the liner of the primary head. Thanks to this capacitive principle the measurement is less dependent on flow profile and wave formation, and levels can be measured accurately and continuously over the entire pipe cross-sectional area. A welcome byproduct of the TIDALFLUX's high measuring accuracy is low hydraulic losses and a low maintenance requirement. Calibration of the meter in the field is not necessary; continued accuracy is virtually assured with little or no involvement by operators or technicians. For more information please visit: www.krohne.com. PLASTIC PIPING AND FLUID CONTROL SYSTEMS PROVIDE A SAFER, CORROSIVE-FREE ALTERNATIVE Replacing traditional materials Challenging environments on site, coupled with the requirements for the conveyance and storage of varied liquids from drinking water to hazardous chemicals, place high demands on piping systems in terms of safety, costs and subsequent maintenance. Fusion's plastic piping and fluid control systems are an innovative and highly practical way of replacing traditional piping and storage systems. "By implementing a total plastic solution you no longer have any issues with corrosion and that means less maintenance and costs," says Ben Karel, Fusion's Managing Director. "In addition, plastic is a lighter material and is contamination-free as our solutions offer clean, inert materials for the safe transfer of liquids from drinking water to highly hazardous materials". When safety is paramount Pipes, fittings, values and components need to be connected safely and reliably. When distributing liquids for main lines, service lines or hydrants, safety is imperative and that's when a corrosive- free, fully integrated environment comes into its own. With branches in Brisbane, Melbourne and Perth, Fusion offers complete solutions in plastics engineering, fabrication and piping systems -- the only company of its kind in Australia to do so. For more information please phone: (08) 9494 1004, email: info@fusionaus. com or visit: www.fusionaus.com. Back River WWTP in Baltimore, US. Fusion's Custom Projects UPVC Sch80 water treatment skid. pipelines feature Chemical dosing panel for desalination plants manufactured from high-grade polypropylene sheet -- lightweight, with excellent chemical resistance, and corrosion-free.
Water Journal April 2011