plant, 380KV substation, and the main control room (MCR) were carried out. Our team, which had been kept waiting during the summer of 2016, was faced with a bigger challenge this time due to the bigger scope and the ESD system cut-over. Unlike the FOXBORO DCS, the Triconex safety instrumented system could not be downloaded because the plant did not have a Tri-station. So, using the available documents in the customer’s library, our team built the SIS application logic from scratch for the ProSafe-RS system. The lessons learned and the rich experience gained during the first shutdown helped us get things on track in a short period of time. We were no longer novices in control system replacement jobs. The core task of commissioning the power generation units was given the highest priority, while the less urgent refurbishment of the MCR was planned towards the end of the shutdown schedule. The work done during the second shutdown was also a big success.More than a hundred personnel from SEC received extensive training on the CENTUM VP R5 DCS and ProSafe-RS R3 safety instrumented system. Tailor-made courses on engineering, maintenance, operation and system administration were planned in batches and scheduled to be conducted On-site for several weeks so as not to interfere with plant operations.After completion of all project requirements and a one month reliability test, Yokogawa was issued a Final Completion Certificate (FCC) in May 2019. The subsequent one year warranty period concluded in May 2020. As mandated in the contract, a Yokogawa resident engineer was stationed at the PP9 site during the warranty period to keep watch on the systems. As a token of their appreciation, SEC sent us a letter applauding our years of hard work and the results of our efforts. It was teamwork and a job well done that everyone involved can cherish for years to come. When we called to thank the plant operation manager who was also the head of the project committee, he replied “You guys deserve it.” Our happiness knew no bounds, and project PP9 is yet another feather in Yokogawa Middle East & Africa (YMA)’s cap.24The main control room with mimic panels (before replacement)under the supervision of our engineers, the site contractor was identifying trenches, pulling cables, getting rid of old items, cutting, welding, cleaning, and so forth. The site activities were all meticulously planned in preparation for the much-anticipated installation and cutover activities.Considering the peak load power requirements in summer, SEC had scheduled the shutdown in two phases. The 1st first phase of shutdown from November 2015 to March 2016 included the cut-over and commissioning of Block-A1, Block-A2 and Node-81 (Liquid fuel systems). The FAT was just a rehearsal. But the Cut-over and commissioning were a live performance. We were keeping our fingers crossed and hoping for the best to bring the units back to life again. Everyone had only one goal which was to synchronize the units to the grid and put back the power blocks to commercial operation. To everyone’s relief, the GTs were quickly synchronized to the grid one after the other with all the related auxiliaries being controlled from CENTUM VP DCS without much hassles. This bolstered the customer’s confidence in the capabilities of our team, the quality of our engineering, and the depth of our commitment, and with their good support we were able to easily put the STs back in service. The activities carried out during this first shutdown were a great success.DCS marshalling panel after cut-over from FOXBORODuring the second phase of shutdown from October 2016 to February 2017, the cut-over and commissioning for sub-blocks B1 and B2, node 82 (fuel gas systems), the water treatment Saudi Electricity Company PP9 / Saudi Arabia
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