SEWAGE & SLUDGE TREATMENT |


A reliable pipework system was required to connect new generators to the main fuel tank at Mogden STW; plastic systems like the Durapipe PLX (left) simplify installation


that can be used to provide high performing pipework so- lutions for emergency fuel sup- ply. Lightweight and easy to install by nature, plastic pipe- work eradicates the complex installation properties associ- ated with metal alternatives. Plastic systems, such as Durapipe PLX, simplify the installation process for con- tractors, as they do not need a skilled welder to install the system due to the electrofu- sion jointing system. In ad- dition, they do not require the use of hot works permits when being installed. Plastic pipework was em- braced as part of a major upgrade to Thames Water’s Mogden


Sewerage Treat-


caused if fuel was to leak into the environment. These sys- tems are becoming compulso- ry for many pipework appli- cations, and are the preferred solution for fuel conveyance. Durapipe stresses that not secondary


all containment


pipe systems are the same and they all offer different performance tion


and capabilities. installa- Tradition-


ally, steel pipework has been specified as the preferred pipework solution to provide


generators with the fuel they need to function, although frustratingly, these pipework solutions are also known to sometimes fail.


A common cause of flawed systems can be fuel not reach- ing the emergency generator, meaning it has no way of functioning. This can occur for several reasons, includ- ing complete corrosion of the pipework, where the fuel or the environment has pen- etrated the pipe or there is


for InLine+


rine, meant we opted for UV technology instead.” UV disinfection has none


of


the drawbacks of chlo- rination – it is completely chemical-free, and produces no unpleasant by-products. It is also simple to operate and maintain.


Chernihiv waterworks se- lected two Berson InLine 16000 systems, operating in parallel mode. Each UV chamber is equipped with 12 automatically-wiped me-


dium pressure Multiwave UV lamps and can treat effluent at a flow rate of 2,000m3/h (4,000m3/h in total). Because of the InLine design of the closed treatment chambers, they have low headloss and are also very compact with a small overall footprint, al- lowing them to be installed in a very small building. The incoming effluent is gravity- driven.


Shkin says: “The fact that the Berson systems are closed and are equipped with au- tomatic wipers means our employees don’t come into contact with the wastewater or the UV from the lamps – this is an additional impor- tant safety consideration. Finally, as the UV chambers are very compact with low headloss, we are able to save on construction and pumping costs.”


July 2012 | WET News | 15


clogging of the pipe bore, re- sulting in fuel not flowing at a consistent rate.


The difficulty with steel, is that although it has been felt to be a durable pipework solution for certain appli- cations, the lifespan of this durability is limited and has shown no signs of improve- ment. This provides concerns for emergency fuel solutions, as although the hope is that it will never be called upon, it is still required to perform.


Contractors need to be


aware that with an estimated fuel carrying lifespan of just over five years steel is a so- lution that cannot guarantee performance capabilities over a long period of time, and corrosion may prevent it from performing when required. In terms of the installation process, this can be lengthy with traditional metal pipe- work and whether these systems are installed under- ground, or above ground,


they require skilled installers to fit the pipework. In the case of installing underground pipework systems, hot works permits are needed, which can result in an extremely compli- cated and timely installation process. Considering these issues, it sparks the question of why innovative materials, such as plastic, are not being readily exploited by contrac- tors and specifiers.


reliable


Plastic, is an example of a alternative


material


ment Works in Isleworth. As part of the project, three new back-up generators have been installed and a reliable pipe- work system was required to connect the new generators to the main fuel tank. The pipework was required to be installed underground and so contractor MWH Treatment needed a system that would ensure fuel did not leak out into the ground, causing dam- age to the environment. The project was therefore specified as Durapipe PLX. Steve Sager, from MWH Treatment, says: “The prod- uct material characteristics, and the pipe-in-pipe aspect of the pipework, was the decid- ing factor for us, as we needed to be confident we would not be accountable for fuel leaking out into the ground. “We’re liable


for fines if


there was to be a pollution incident, outside of the agreed limits, so we needed to ensure that all systems and equip- ment that we installed as part of the upgrade could help us keep this under control.” n


David Naylor is brand manager for Durapipe PLX. www.dura- pipe.co.uk.


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28