CASE STUDIES


drain TRADER


K-TORKpneumatic actuators used in biggest planned ultrafiltration retrofit inUS history


T


he K-TORK actuators control the flowof surfacewater in the membrane system, helping to process up to 52million gallons of


water a day. Over 300 Rotork K-TORK pneumatic vane actuators have been installed at one of Florida’s largest low-pressure ultrafiltration (UF)membrane plants. The plant treatswater fromtwo separate sources, one for surfacewater fromthe surface of a lake and the other for groundwater fromthewell fields. It is the onlymunicipal drinkingwater plant owned and operated by the county and has the capacity to process of 84million gallons per day (mgd) for over 350,000 residents,with up to 30mgd treated in the separate groundwater treatment basin. The actuators control the flowof surfacewater in and out of the membrane system.This includeswater coming in to be filtered, clean water flowing out to be used for drinkingwater supplies and clean water flowing in in order to clean themembrane.TheUF process removes particles fromthewater in order tomake it fit for human consumption. It has the capacity to process 52million gallons ofwater per day. The installation is amarked success for Rotork, as it holds the distinction of being the largest plannedUF retrofit project inUS history.The project includes refinements to the existing pre-treatment system, the addition of pre-screens, replacement ofmedia filterswith 12 immersedUF trains, and addition of ancillary systems including Clean in Place (CIP) system, neutralisation system, backwash system, air


system, and chemical feed and storage systems. Rotork’s actuatorswere selected for this project due to their high duty modulating cycles. K-TORK actuators have a torque output of up to 18,300Nm(155,000 lbf.in) and provides precisemodulating control for quarter-turn control valveswith an accuracy of 0.25%.Capable of millions of operations at fast cycle times, their lowfriction, dual opposed lip seals ensure an extremely long operating life. Rotork’s long-standing historywithUFmembrane installationsmade theman ideal choice for this project.


Replacing pitch fibre pipes M


ammothMTS is the UK’smain HammerHead Trenchless dealership supplying HammerHead pipeline replacement


systems for pipe bursting aswell as impact hammers for installation, ramming and piling operations. MammothMTS recently supplied a cable-basedHammerHead PortaBurst™Static Rope Burster (PB30) pipe bursting systemto Lining Division Ltd,which is based in Bexhill on Sea, East Sussex,U.K.The system,APortaBurst™Gen 2model,was purchased by LiningDivision to replace its previouslywell utilised PortaBurst™Gen 1model. LiningDivisionwas recently called upon to complete a pipe bursting project that involved the replacement of a 45mlong pipe section comprising a 150mmdiameter pitch fibre sewer.Theworkwas carried out as a subcontract to one of LiningDivision’s regular clientsCappach BrowneUtilities Ltdwhichwasworking on behalf of one of theUK’s WaterCompanies, SouthernWater.Thework involved the replacement of a blind connection serving two houses. In this instance the blind connectionwas a pipe connection thatwas not accessible as itwas buried under a recently laid resin bonded drivewaywhichwas not to be disturbed by theworks. Themain contractor excavated and supported the reception pit


26 drain TRADER | July 2020 | www.draintraderltd.com


required by LiningDivision to complete the newinstallation,which was completed using theHammerHead PB30 pipe burster.The new pipelinewas a 160mmdiameterMDPE pipewhichwas installed in short sections behind the bursting head of themachine. To connect the newpipe to the existing drainage systemfor the two houses, the blind connectionwas successfully reinstated using a special IMS robotic cutting systemto create an opening in the new160 mmdiameter pipe, the location ofwhich had been surveyed in relation to the launch pit prior to the bursting run, intowhich a‘TopHat’Cured In Place sealwas installed. Commenting on the project Paul Brooker of LiningDivision Ltd said: “Thismethodwas chosen to avoid costly excavations through the customers’concrete/resin-bonded driveway that served the two houses involved.The upstreamchamber of the drainage systemwas utilised as a launch pit for the PB30 pipe burster and this allowed us good access to introduce the newpipe systemduring the bursting process.The full installationwas complete in just seven hours.The excavation for the reception pitwas filled in the following day to complete theworks.This project succeeded efficiently and quickly thanks to the great teamwork and cooperation between all the companies involved, resulting in a better service to our customers.”


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