US-listed suezmax specialist Nordic American Tankers (NAT) has taken all of its four 20-year-old vessels through their fourth special survey.

The 151,000-dwt Nordic Harrier, Nordic Hawk and Nordic Hunter (all built 1997) have passed survey this year “at a cost of less than $2m per vessel”, according to a company spokesman.

The ships, which are the original units in NAT's fleet, also have Condition Assessment Programme (CAP) 1 Hull and CAP 1 Machinery and Cargo System, he adds.