Major electrical machinery maker Yokogawa Electric Corp. said Wednesday it has received an order from U.S. energy company Chevron Corp. for an oil refinery management system, estimated at more than 100 billion yen.

The bulk order for the refinery management system to be used in eight Chevron refineries around the world will be the largest of its kind ever delivered to a refinery operation, said Masatoshi Okabe, a spokesman of Yokogawa Electric.

He said the value of the order could not be disclosed due to confidentiality with the client.

The Nikkei business newspaper reported Wednesday, citing unidentified company officials, that the order will exceed 100 billion yen, including maintenance costs.

Yokogawa, based in Musashino, western Tokyo, will deliver the system over 10 years to replace the current Honeywell system at Chevron's eight refineries in the U.S., Britain and South Africa, to bolster production efficiency and safety with the new system, Okabe said.

The eight refineries account for about half of San Ramon, Calif.-based Chevron's overall production, processing about 1.3 million barrels of oil a day, he said.