Using the process scenario, current operating conditions, and process sketch provided in the drawing, write an operative procedure to prepare the north reflux pump for service, put it into service, and shut down the south reflux pump. Your system will stop when the north pump usually operates, and the south pump has been safely removed from service. - Demonstrate the principles, concepts, and techniques introduced in this chapter. - Ensure compliance with applicable safety, health, and environment (typical process facility policies) and OSHA regulations. Process Scenario - During regular operation, one reflux pump maintains reflux to the refining column and the second pump remains on standby. - The refining column operates typically and within limits; however, the south reflux pump has developed a seal leak and must be shut down and prepared for seal replacement. - There are no environmental or safety concerns because of the seal failure. Leakage across the seal of the south pump is venting to the flare Process Scenario - During regular operation, one reflux pump maintains reflux to the refining column and the second pump remains on standby. - The refining column operates typically and within limits; however, the south reflux pump has developed a seal leak and must be shut down and prepared for seal replacement. - There are no environmental or safety concerns because of the seal failure. Leakage across the seal of the south pump is venting to the flare through a dedicated vent line. - The north reflux pump was recently out of service for maintenance and must be prepared and placed in service. - Reflux flow must be maintained to avoid disrupting the process and loss of production. Current Operating Conditions - All control parameters are within required limits and at set points. - Isolation valves around the north pump are still closed because of the recent maintenance work