Double fatality in onshore pipeline construction

Due to differential thermal expansion forces in strong sunlight, a curved section of pipeline on temporary construction supports moved suddenly when frictional resistance was overcome. Two workers died as it fell from the supports.

More details in IOGP Safety Alert #277.

'Changing ambient conditions’ would probably be missing from most risk assessment checklists, whether documented or experience-based, so this would be one for your organisational memory bank.