Process Modeling Simulation & Control: post #1145 — TG.ME

1- Level Switch Low Low (LSLL): the lowest safety level at which the equipment can operate without compromising the downstream system. If you have a pump, it must guarantee the minimum NPSHa, for instance. The system will shut down if this level is reached. 2- Level Switch Low (LSL): is the level of liquid below normal conditions. It will trigger an alarm for the operator, alerting them that the level is lower than it should be. 3- Normal Liquid Level (NLL): is the normal liquid level. It should be the level kept to guarantee the residence time in the vessel. 4- Level Switch High (LSH): is the level above the normal condition. It will trigger an alarm for the operator, alerting the level is higher than it should be. 5- Level Switch High High (LSHH): is the highest level at which the equipment can operate without compromising the downstream system. If you have a compressor, it must guarantee you will not have an excess of liquid droplets going to the compressor, for instance. The system will shut down if this level is reached. .