Unicon International Ltd and Det Norske Veritas (DNV) have joined forces to provide tank owners/operators and leasing companies with world-wide tank certification services for ISO tank containers, which must be certified every two and a half years for the carriage of hazardous materials. The new agreement took effect on February 1, 1999.
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机译：Unicon International Ltd和Det Norske Veritas（DNV）联手为储罐所有人/运营商和租赁公司提供ISO储罐容器的全球储罐认证服务，必须每两年半对运输危险材料进行一次认证。新协议于1999年2月1日生效。
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