Fresh Water from the Sea – Automating a World–Scale Desalination Plant
Talking of Auma’s involvement in the project, Managing Director, Auma India, Arvind K Goel averred, “Our scope of work included supplying and commissioning assistance for actuators with integral starter (274 nos.) with MODBUS communication protocol, using redundant line topology resulting in high process availability and faster response time. These actuators are connected to the DCS supplied by ABB.”
Using Electric Actuators – Automating the Flow Process
Pentair Ltd / VA Tech Wabag had awarded the contract to Auma India for the supply of electric actuators for automating all valves. This company is the only electric actuator manufacturer in India offer MODBUS enabled actuators with open protocol architecture in redundant line topology, allowing easy and hassle free integration of actuators with any DCS for this project.
“Only actuators with integral starter (274 nos.) with MODBUS communication protocol were needed in this project. The Nemmeli SWRO is a state-of-the-art desalination plant comprising of seawater intake system, pre-treatment system (disc filters and ultra filtrations), backwashing, reverse osmosis system (product treatment through RO high pressure pumping and pressure exchanger, filtering the rejected water) and posttreatment system.
Desalination With State–of–the–Art Automation Technology
These MODBUS enabled electric actuators in redundant line topology allows quick response time of about 125 ms to the DCS, resulting in optimum reliability and maximum plant availability. High degree of automation results in better efficiencies,” elucidated Goel. Conventional technologies include use of standard electrically operated valves, which can be connected in loop topology that is slower in communication speed compared to redundant line topology.
The process at Nemmeli desalination plant required fast communication to the DCS and needed to establish robust control architecture. Hence, the solution offered by the company was superior to the existing technologies.