xtra tba slidestba removal twr syst sd to standby

1、TBA REMOVAL COLUMN SHUTDOWN TO STANDBYNOTE: This is for Training only, and is not intended to be used as a step by step procedure.PO/MTBETBA Removal Column Shutdown To StandbyPurposeThe purpose of this procedure is to place the TBA Removal Column System in total reflux in the event of a temporary st

2、oppage of feed and effluent flows.The act of placing the system in total reflux is to apply the proper of amount of reboiler steam flow to create enough vapors in the overhead system to maintain a steady and continuous reflux flow rate while the reflux drum level controller is in Automatic control.C

3、onditionsA temporary loss of feed from upstream equipment or a temporary stoppage of effluent to downstream equipment has occurred. In a shutdown to standby condition, only the control valves will be closed using the valves controller unless a control valve is suspected of leaking through.In those s

4、pecial cases, a block valve will have to be manually closed to eliminate the leakage.NOTE: This is for Training only, and is not intended to be used as a step by step procedure.PO/MTBEGUIDELINE Close feed control valve from 2nd Stage Primary Fractionator FV-25218A with FC-25218A. Monitor S1 steam fl

5、ow to TBA Removal Preheater with FC-37730. Monitor nitrogen flow to TBA Removal Column with AV-37755. Monitor TBA Removal Column differential pressure with PDI-37722. Monitor TBA Removal Column overhead temperature with TI-37704. Monitor TBA Removal Column level with LC-37717A. Monitor TBA Removal C

6、olumn tray temperatures. Monitor feed flow to TBA Recovery Column with FC-37718. Monitor TBA Removal Column side draw flow to 2nd IC4 Recycle Column withFC-37712. Monitor any TBA Removal Column side draw flow to 2nd Stage Primary Fractionator. Monitor Dry TBA Tank level from TBA Removal overhead distillate flow. Monitor TBA Reflux to TBA Removal Column with FC-37706. Monitor TBA flow from reflux pumps to Crude TBA Tank with FI-37705. Monitor TBA Removal Reflux Drum level with LC-37705. Monitor Oxygen Analyzer on TBA Vacuum Pack