A low-cost alternative to heavy fuel oil (HFO) being trialed in collaboration with Denmark’s Maersk Line looks to have suffered a setback.

Earlier this month Quadrise Fuels International (QFI), the makers of the MSAR fuel, said the trial vessel had to undergo an unscheduled dry docking.

The vessel, believed to be the Seago Istanbul (built 2007), is thought to have been in a collision with navigational buoys.

The Danish-flagged containership had been receiving the MSAR fuel from a dedicated bunker barge in the Bay of Algeciras.