Endress+Hauser assists with electricity generation.
Following the success of Endress+Hauser’s involvement in the Western Cape open cycle gas turbine (OCGT) project for Eskom, the company was awarded a similar contract for the expansion project – Gas 1. The project includes fuel offloading, fuel storage and fuel forwarding.
Scope and strategic partnerships
The Gas 1 project saw Endress+Hauser collaborating with project house Lesedi Nuclear Services to design and supply instrumentation and Profibus network for the fuel supply system to the turbines. Endress+Hauser was also responsible for automation supply through its system integrator, Process Dynamics, as well as project management, installation and commissioning.
The new project includes a completely new site being constructed in Atlantis with five new turbines, three tanks and five offloading skids, while Mossel Bay is being upgraded with two turbines and a new fuel storage and forwarding system.
Design and implementation
The fuel offloading system, offloading diesel from tankers at Ankerlig and Gourikwa, was co-designed by Endress+Hauser, utilising third party buy-outs from valve manufacturers for the control valves, vessel suppliers for the air eliminator vessels and a sophisticated grounding system for the road tankers.
The Endress+Hauser team designed the offloading sequence in the bays for maximum efficiency using Promass Coriolis flow meters and control valves to be able to regulate the flow rate depending on the amount of diesel in the tankers. “This essentially ensures that the system is able to completely drain the tankers and reduce costs,” says Frans van den Berg, product manager (flow), Endress+Hauser.
Promass 80
For the fuel storage, the company utilised the FMP40 guided radar for level measurement together with the TR10 temperature sensor on TMT184 Profibus transmitter for temperature measurement.
TMT184
For the fuel forwarding system, the PMP71 and PMD75 pressure and differential pressure devices were used for precise pressure control. The Prowirl 72 vortex flow meter was used for monitoring the forwarding flow rate.
An additional requirement of the project was for a fuel transfer system. The system will transfer fuel from the existing OCGT site to the newly built Gas 1 site and vice versa.
Communication and safety
The complete fuel supply system was designed around Profibus technology which offered the end user cost savings and other advantages. Van den Berg notes that once the decision was made to use Profibus, instruments best suited to the application were chosen. “The complete fuel supply is a critical system and was designed with redundancy in mind, ensuring optimum efficiency and minimal downtime, and selecting the best suited instruments ensures its continued success.”
Van den Berg concludes that the second project, expected to be complete early in 2009, was the ideal platform for Endress+Hauser to demonstrate its depth of expertise, resources and product basket.
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