At approximately 3:30 p.m. on June 14, 2012, Employee #1 was performing hydro testing of two recently constructed and installed crude oil pipelines. The employee removed a pressure test manifold from a pressure test flange while the pipeline contained a pressure of 2000 psi. Employee #1 did not lock-out the pipe valves, nor bleed the pressure off of the line prior to removing the pressure test manifold. The employee was struck-by the pressure test manifold that was propelled by the stored pipeline pressure. Employee #1 was transported by the impact of the manifold for a distance of 40 feet. The steel pressure test manifold impacted the skull of the employee which resulted in injuries to the employee and subsequent death.
Source: OSHA.gov
Note: Obviously the pipeline was not filled up complete;y with water and air was pressurized, resulting in the propelling of the pressure test manifold
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