On December 18, 2012, a Chevron offshore oil rig’s lower marine riser package separated from the blowout preventer, releasing approximately 432 barrels of synthetic-based drilling fluids into the Gulf of Mexico.
Chevron told the Bureau of Safety and Environmental Enforcement (BSEE) that the incident was the result of the failure of H4 connector bolts manufactured by GE Oil and Gas (formerly Vetco-Gray).
Based on the initial failure analysis, GE sent replacement bolts for all known H4 connectors to customers worldwide.(…)
via Fastener Experts Address Hydrogen Embrittlement Claim – Global Fastener News – USA.