Implosion of a Large Crystallizer Vessel

The collapse of the body of a large crystallizer vessel while it was being drained is reported. A simple model is developed to investigate the liquid level and gas space pressure dynamics for various degrees of obstruction of the vent valve. The causes of failure of the venting system are identified. An analysis of possible damage to interconnected components is presented and alternative system modifications suitable for avoidance of similar such accidents are discussed.