In 2009, a massive failure of the power generation turbine at a hydroelectric plant in Russia killed about 74 people. According to Wikepedia, the root cause was attributed to lack of complete bolting of the turbine casing cover. The consequences were horrendous.Do not underestimate the power of water in a process plant. Water hammer, flashing of water into steam are hazards that can cause severe damage to plant equipment. Train your operators on these hazards.
Read about the failure in this Wikepedia link.
See amazing photos of the disaster in this link.
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