Pumping Under Pressure: The Ins and Outs of Emergency Cargo Pump

In this episode, we discuss the emergency cargo pump, a critical piece of equipment used when a vessel's main cargo pumps fail. We cover the pump's installation, operation, and the importance of adhering to strict safety and operational procedures to prevent equipment damage and ensure personnel safety.Our discussion walks through the entire process of deploying the emergency cargo pump, from its storage and transportation to installation in a cargo tank. We detail the necessary pre-operation checks, including the crucial 10-hour gas cooling period and the subsequent one-hour liquid submersion for thermal stabilization. We also explore the pump's operational parameters, safety features, and the specific steps for starting and stopping the pump, both in normal and emergency situations.The emergency cargo pump is a submerged motor pump cooled and lubricated by the LNG it pumps.Proper installation involves purging the pump well with nitrogen, careful handling of power cables, and the use of a portable air winch and davit.A critical pre-operation step is the 10-hour gas cool-down followed by a one-hour liquid submersion to ensure thermal stabilization and prevent pump damage.The pump must not be started against a closed discharge valve to avoid insufficient cooling, lubrication issues, and excessive vibration.Safety features include low discharge pressure switches, undercurrent and overcurrent relays, and automatic shutdown in case of ESD activation or other critical faults.The pump has specific restart limitations to prevent damage, with different protocols for normal and emergency restarts.Operating the pump outside its specified capacity range of 196m³/h to 550m³/h can lead to damage and reduced performance.Actionable advice includes the importance of using lanyards for tools when working near open pump columns and ensuring all personnel are familiar with the pump's operation and safety procedures.