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Riser de-packing
An overpressure hazard to the downstream separator is provoked if:
• The choke valve is opened too fast
• The choke not opened last – choke left open and remaining shutdown valves
opened (various combinations)
How do valves get into wrong line-up?
• Can be operator error on start-up
• Operator error on a manual shutdown
• Fail to close on a shutdown