Capacity Requirements Evaluation for Process Operation Non-Fire

Capacity Requirements Evaluation for Process Operation (Non-Fire) 

It must be emphasized, that the determination of the anticipated maximum overpressure volume at a specified pressure and temperature is vital to a proper protection of the process system. The safety relief calculations should be performed at the actual worst conditions of the system, for example, at the allowable accumulated pressure and its corresponding process temperature. These can be tedious and perhaps time-consuming calculations, but they must not be glossed over but developed in a manner that accounts for the seriousness of the effort. They must be documented carefully and preserved permanently. 

The situation is just as critical, if not more so, for runaway reactions or reaction conditions that are not ade- 

Failure of Cooling Water assume all cooling mediums fail, determine relief capacity for the total vapors entering the vessel, including recycle streams. See [3] and [10], 

Reflux Failure (a) At top of distillation column, capacity is total overhead vapor [10], (b) when source of heat is in feed stream, capacity is vapor quantity calculated in immediate feed zone [3], (c) when reboilers supply heat to system, capacity is feed plus reboil vapors [3]. Each situation must be examined carefully. 

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