大家进来讨论一下“holdup time”？ here are the definations: hold-up time: is defined as the time it takes to reduce the liquid level from normal liquid level (nll) to low liquid level (lll), while maintaining a normal outlet flow without feed makeup. hold-up time is based on the reserve required to maintain good control and safe operation of the downstream facilities. surge time: is definded as the time it takes for the liquid level to rise from normal liquid level (nll) to high liquid level (hll), while maintaining a normal feed makeup without any outlet flow. surge time is usually based on the requirement to accumulate liquid as a result of normal variations in process yields and control system responses. retention time: is defined as the net working volume divided by the normal liquid flow rate. the net working volume is the volume of tank or vessel between the low and high level alarms (lll to hll). is it clear now?查看更多
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