MODEL RELEASED. Oil rig inspection. Technicians examine a pipe on a North Sea oil rig. The pipe being inspected here is a 90-centimetre (36-inch) cut-off from the riser. The high oil pressures and corrosive environment experienced by offshore oil rig equipment mean that regular inspections such as this one are necessary to ensure safety. Photographed during research conducted by the British Health and Safety Laboratory. CROWN COPYRIGHT UNDER LICENCE FROM THE HEALTH & SAFETY LABORATORY & CONTROLLER OF HER MAJESTY'S STATIONERY OFFICE