Inspectioneering Journal

Risk Based Inspection (RBI) Applied to Power Boilers-

This article appears in the May/June 2001 issue of Inspectioneering Journal

This is a summary about RBI application to plant utility boilers in a liquefied natural gas plant with a design life of 20 years, now 27 years old. The plant is the Brunei Liquefied Natural Gas plant, which began operating in 1972. It is owned jointly by the government of His Majesty the Sultan and Yan Di Pertuan of Brunei Darussalam, the Mitsubishi Corporation of Japan, and the Royal Dutch Shell Group, with Shell also being the technical adviser.

Plant production capacity is 7.2 million tonnes of LNG per year. Product is shipped to customers in Japan and Korea. According to the website article the plant has not missed making a shipment of LNG in 27 years. It is crucial that reliabity/ availability levels remain high. To ensure it continues to operate reliably, the plant recently commissioned a remnant life assessment of its nine steam- generating boilers.

The plant’s utility boilers are central to the whole operation as they generate steam for the production process and electricity for the plant. No steam means no production.

To undertake the life assessment, one of the boilers was examined during a routine shutdown to assess both its current condition and the potential for degradation, and to identify the components most at risk. Because the nine boilers are identical in design, age and operating regimes, the results from one boiler could be applied across all nine. Inspection records covering the plant’s 27 year life were used as references, in addition.

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