Key features are the detailed process control, the number and process location of relief valves and other methods of process relief, equipment isolation, depress surmising requirements and allowance for the various operating modes of the plant.

• 关键特征包括:详细的工艺控制点，放空阀的数量及工艺位置和其它的工艺卸载方法，设备绝热，卸压要求和对工厂各种操作模式的容许限。