Valoriza Agua

Sohar Sea Water Reverse Osmosis Plant

Sohar (Oman)

Sacyr, via its subsidiary for management of the integral water cycle, Valoriza Agua, got awarded the design, construction, operation and maintenance of a 1,200 million dollars seawater desalination plant in Sohar.


Oman is located in an arid region with limited ground water resources and to meet the growing demand for potable water, large and small brackish and seawater desalination units have been installed in different parts of the country. This desalination plant with reverse osmosis technology will have a capacity of 55 MIGD (250,000 m3/day) which is one of the largest investments in desalination of seawater in Oman. The plant will begin operation at the end of 2019.


SPIN, thanks to its proven track record of successfully delivering control systems solutions for water infrastructure projects, was selected as the preferred contractor for the Control System Integration package.


The Control system is based on the Siemens DCS PCS7, with high availability controllers and redundant Profibus-DP networks.


Key responsibilities:

  • Control System Architecture Design
  • Procurement, Programming, Integration and Commissioning of Plant Control System
  • Design and supply of control cubicles
  • Cibersecurity Management Plan in alignment with stringent security requirements
  • Process Historian and Reporting
  • Integration with multiple vendor packages
  • Integration with Water Authorities metering systems
  • Asset Management packages
  • Remote assistance
  • Commissioning and training of personnel


Project’s important highlights:

  • More than 5000 process objects treated
  • Management of >30,000 I/O
  • Automatic adjustment of process variables to cater for configurable production output
  • Custom made program blocks and faceplates to accommodate both site requirements and comply to Siemens APL standard
  • Undertaking of commissioning activities under harsh and demanding climatic conditions


The Control System and IT Platform:

  • Siemens PCS7 Distributed Control System
  • Windows server infrastructure
  • Cisco Network Switches for Dual Redundant topology
  • Procentec Profibus/Profinet equipment to enable diagnostics
  • Virtualization using our partner’s VMWare ESXi platform (global leader)
  • Network segmentation using several network layers and different fieldbus such as Profinet, Profibus