The U.S. Interior Department issued a safety alert on Tuesday, warning offshore oil and gas drillers about recurring problems with bolts on equipment including blowout preventers.
The Bureau of Safety and Environmental Enforcement (BSEE) said it was aware of a “recurring problem of connector and bolt failures” in components used in risers and underwater blowout preventers used in offshore drilling.
“These failures are of great concern to BSEE due to their frequency and the potential for a catastrophic event,” the agency said. In 2012, failures led to a global recall of bolts and a temporary stop to drilling activities, BSEE said.