"With little margin for error, ships are still scraping the walls and prematurely wearing out defences designed to protect both the vessels and the locks themselves," American Shipper cited an AP report as saying.
AP reporters travelled on a recent voyage by a tugboat guiding the containership Ever Living through the canal's Cocoli locks on the Pacific side of the waterway and found "multiple places where the black rubber cushion defenses were visibly worn down, hanging into the water or missing entirely."
"In one spot, a pile of dislodged bumpers sat on the side of the locks, apparently waiting to be hauled away," it added.
London-based risk management consultancy PGI Intelligence in July 2016 published a report warning of "considerable safety concerns" with the canal expansion that could lead to accidents and delays for shippers and higher claims for insurers. According to the report, at 427 metres long and 55 metres wide, the new locks are still too small for neo-Panamax ships.
"The largest vessels can measure up to 366 metres long and 49 metres wide, leaving a distance of just six metres across the width of the canal and 61 metres length-wise, much of which will be taken up by tugboats on either end of the vessel to guide it through the lock," said PGI.
"A joint study by the International Transport Workers' Federation (ITF) and Brazil's Fundacao Homem de Mar (FHM) found that under windy conditions, the maneuverability of vessels would be compromised, making accidents likely due to the lock's narrow dimensions."
Since the expansion's opening in late June 2016, two per cent of vessel transits (15 of a total 700) have resulted in incidents that damaged the ship or the canal locks themselves, according to data from the Panama Canal Authority (ACP).