Study on Configuration and Influence of Safety Instruments at the Discharge of Multistage Centrifugal Pump

The configuration of safety instruments at the discharge of multistage centrifugal pump aiming at preventing high pressure letdown during shutdown is becoming more and more popular in refining installations in recent years.In order to study the influence of these safety interlocks on pump safety,the sufficiency and necessity of these interlock,especially emergency shutdown valve,were analyzed.The influence of spurious close of shutdown valve and associated water hummer were also studied.By analysis it is found that the necessity of safety instruments at the discharge of pump should be carefully studied.The findings are helpful for the determination of minimum close time of emergency shutdown valve.