Iran crude exports stall under US blockade pressure in May

A reported build-up of roughly 80 million barrels of stranded Iranian oil and petrochemicals points to heavier tanker congestion, floating storage pressure and sanctions-driven disruption near key Gulf routes.

Iran appears to have struggled to move crude exports beyond the US blockade line in May, with UANI estimating that about 80 million barrels of oil and petrochemicals remained stranded in waters behind the enforcement zone. If accurate, the figures suggest pressure on Iranian seaborne exports intensified further last month, extending delays for tankers and making monetisation of sanctioned cargoes harder across the Gulf shipping system.

For TankerMap readers, the shipping angle matters most. A larger volume of trapped barrels implies more floating storage, tighter vessel utilisation and continued operational distortion around Gulf loading and transit routes. The development also reinforces how sanctions enforcement is shaping tanker patterns well beyond headline policy, especially for owners, traders and charterers tracking risk around Iranian-linked cargoes.