The fleet operations of National Iranian Tanker Co (NITC) have once again come under the spotlight ahead of the expiry of US waivers for sanctions against Iran on 2 May, with floating storage and ship-to-ship (STS) transfers expected to increase.

NITC, listed by Clarksons as the world’s sixth-largest crude carrier by shipping capacity, had been shipping nearly all of Iran’s crude exports to the countries with waivers since US sanctions came into force last November.