The Abqaiq plants.
Robust controls for largest crude facility
01 July 2016
MAJED AL KHALIS, control systems engineer at Saudi Aramco’s Abqaiq plants facility, elaborates on the successful control system cutover at the world’s largest oil processing plant.
With the capacity to produce over seven million barrels per day, Saudi Aramco’s Abqaiq Plants comprise the largest oil processing and crude stabilisation facility in the world.
Abqaiq is the main oil processing centre for Arabian Extra Light (AXL) and Arabian Light (AL) crude oils and produces natural gas liquids (NGL) as a bi-product for Saudi Aramco’s daily oil processing activities. To support both the oil and gas plants, Abqaiq Plants produce their own electrical power, steam, instrument air, and water.
For a complex of this size, an involuntary shutdown would mean great losses in production and would negatively impact the company. In 2008, the Abqaiq Plants team recognised potential challenges were on the horizon. The plants’ existing automation systems would experience obsolescence for distributed control system (DCS) controllers and emergency shutdown (ESD) processors and cards. In addition, these systems would no longer have technical support or training.
After some studies, it was determined that an upgrade and migration cutover was needed of the plants automation system. Abqaiq Plants team began to plan the process of upgrading the existing Emerson Provox DCS, Triplex Regent ESD systems, and burner management systems to the latest release of Emerson’s DeltaV DCS, SIS (process safety system) and BMS (building management system).
The team began the project in October 2011 with a planned completion date of November 2015. Although on-budget and on-schedule cutovers at a processing plant of this size do not happen often, the project team completed the cutover activities two months ahead of schedule by the end of September 2015.
Abqaiq Plants complex has three main divisions: oil, natural gas liquids (NGL), and utilities. As such, they are operated from three control rooms: North (north oil plants), South (south oil and NGL plants), and the UCR (utilities plants). The three control rooms interconnect with several process interface buildings (PIBs) throughout the plants to monitor and control plant processes. The control rooms and PIBs represent the veins of all Abqaiq operations and consist of several networks and risk areas.
Distributed over 20 locations, the project included upgrades to 325 controllers, 105 workstations, and 42 network devices. The team divided the project into four upgrade phases: north oil plants, south oil plants, NGL plants, and utilities plants.
Success meant not having a single interruption to plant operations, and the team had to minimise the shutdown time for some of the risk areas that have tight operations. As a result, a hot cutover approach was chosen.
The project team capitalised on three factors to overcome project challenges and complete the project successfully with zero operation impact: human resource development, efficient testing procedures, and streamlined technologies.
HR development
Before starting the project, Abqaiq Plants management took proactive steps to develop a qualified team that included a mix of experienced and new personnel across project disciplines including automation, process, electrical, and communication.
Several engineers, technicians, and operators were sent to vendor courses to increase their knowledge of the new systems. In addition, the project team simulated new systems process and operation scenarios at Abqaiq’s advanced technology centre. The simulation helped to ensure new systems readiness and familiarised plants engineers and technicians with them. The team participated in several project activities and tests including factory acceptance tests (FAT) which increased the competency level of all team members.
Test procedures
To assure readiness and correctness of the new system and to achieve a smooth cutover, Abqaiq Plants’ experienced engineering and operation teams developed testing procedures.
Detailed cutover sequence and contingency plan documents were developed to manage cutover critical activities and predict all possible scenarios during cutover and restoration procedures. The team also developed a plan to relocate the old DCS to a temporary cabinet and keep it running to control the plant. This approach helped to optimise the shutdown period for critical risk areas such as AXL Shippers and steam production plants from one week to two hours. It also enabled a fast fallback strategy to the old system, in case of new systems failure.
Streamlined technologies
The project team took advantage of the upgrade project to implement current technologies in the system network, monitoring, and security. These technologies simplified the cutover, project execution, and troubleshooting.
For example, zoning and subnets were used to segregate different control rooms’ networks. This segregation of networks and systems into unique areas enhanced system security. It also helped to isolate traffic and errors for easier issue tracing and network troubleshooting. In addition, a centralised management system was used to collect system events and key performance indicators.
Abqaiq Plants’ team came up with an innovative design to enhance the cutover period of some plant networks through installing a parallel connections to old and new systems networks. The innovative idea enabled the team to test the new system while maintaining old system connections. This method decreased plant downtime period from a potential 72 hours to zero and allowed for better system testing and recovery. In addition, to stabilise the plant sooner on the new system, critical loops were tuned with the help of Emerson consultants.
The project team also implemented a centralised patch management system to install security patches and antivirus updates. This system enabled the use of Guardian Support, which provided Emerson technology connections, and ensured the project team would discover system issues, if any arose. Not only did it help to mitigate Abqaiq system security and patch issues, but it also provided the team insights into what Emerson learned from projects at other sites.
Results & lessons
By combining planning with methods and technology, the project was completed ahead of schedule and under budget. The resulting reduction in man-hours led to cost reduction and gave the team more time to observe the new system and close some exception items.
Saudi Aramco employees, Emerson engineers, and contractors worked together collaboratively with the support of Abqaiq Plant management as one team to achieve the goals of the project safely without a single negative impact on production.
In addition, the young plant employees have been empowered to lead critical activities. The education and resulting confidence delivered several innovations and noticeable cost avoidances. In essence, Abqaiq Plants’ management capitalised on the development of people to ensure the success of the current project and prepare for future system support.
