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HART Plant of the Year: Heavy crude upgrader in Venezuela

11 March 2009

One of Venezuela’s major oil fields lies in its Orinoco River basin; however, crude from this field is extra-heavy and must undergo upgrading in one of several plants before refining. One of those plants, the Petropiar Mejorador (upgrader) in the José Antonio Anzoátegui industrial complex near Barcelona, Anzoátegui, Venezuela, has been named the 2008 HART Plant of the Year.

Petropiar Mejorador (upgrader)
Petropiar Mejorador (upgrader)

This facility is controlled by PdVSA (the Venezuelan national oil company) in a joint venture with Chevron. It begins with the tar-like feedstock at 7.5°API, and turns it into 26°API synthetic crude. The plant first started operation in 2003 as Petrolera Ameriven, and began delivering product in January 2004. By the middle of that year, it achieved normal production, with capacity rated at 248,000 barrels per day with 1,500 employees.

As in any oil processing facility, reliability is paramount, and with 5,000 instruments communicating with the DCS, eliminating problems from erratic devices is key. To achieve that, Petropiar added Emerson’s AMS Device Manager platform to its Honeywell DCS. This system uses HART technology to communicate intelligent device diagnostic information from instruments and actuators throughout the plant.

‘Since our plant went on line in 2004, HART technology has opened a door of opportunity to the reliability community,’ says Mariela León, Petropiar instrumentation reliability leader. ‘We were able to optimise our work process creating a reduction of maintenance costs, which led to a 60% reduction of lost profit opportunities (LPO) caused by instrumentation faults. Eliminating bad actors and having the ability to reduce random failure has resulted in a reported reduction of LPO on the order of $70 million in two years.’

Based on such successes, the HART Communication Foundation was happy to make its selection for 2008. ‘Petropiar is a perfect example of how the power of HART can be used to lower cost, improve plant availability and contribute to keeping your plant competitive,’ says HART Communication Foundation executive director Ron Helson. ‘We congratulate Petropiar for their foresight, planning, and vision in building a plant infrastructure that allowed the use of the intelligent capabilities of HART-enabled instrumentation.’

Petropiar’s maintenance group found that its efforts using HART made the plant startup go much smoother, as instrumentation performance and calibration problems had been sought out and corrected before the plant went on line. As a result, there were no failures attributed to instrumentation reported during the startup period; the ‘bad actors’ had already been identified and corrected, eliminating 95% of related problems.

Since startup, this preventive method has continued. Calibration tasks are thoroughly defined, with routes and schedules laid out for the entire universe of instrumentation. This emphasis on predictive maintenance allows them to attend to only the items that really need attention, resulting in a 10% increase in effective personnel ‘wrench time.’ This has allowed the plant to operate with a staff of only five reliability engineers and 12 instrument technicians, and still stay ahead of most problems.

REPLACING DUMB SENSORS

These experiences have caused the reliability team to look for other opportunities where HART has not already been put to work. There is still a small population of installed devices that are not HART capable, but these will be upgraded. All new instruments and process analysers must be HART compliant. Moreover, all systems have not yet been integrated into the asset management system, but this also is underway. Some parts of the safety instrumented system (SIS), some PLC-driven subsystems, and the fire and gas detection system are still being incorporated into the larger asset management network.

One example of this increased reliability relates to valve positioners. ‘HART technology was used to pinpoint a bad valve positioner which provided the justification to change or add positioners to 400 valves,’ says Livia Lefebre, reliability superintendent. ‘We also demonstrated the partial valve stroke application to management, who then approved its use, significantly increasing the time between required shutdowns.’

HART technology is also used at the oil production site that feeds Petropiar, and by 2009 the two systems will be interconnected. This will allow the reliability engineers at the upgrader to analyse what’s happening upstream as well.

—Peter Welander, Control Engineering


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