The video shows a controlled pump start-up and subsequent end of line valve closure transient events as shown on VariSim software.
It can be clearly be seen that following pump start-up, the pressure rises downstream of the pump allowing flow to develop throughout the pipeline. Pressure and flow oscillations continue until a steady operating regime is established. At this point, the end of line valve is closed generating a pressure rise upstream of the valve as the flow through it is restricted and ceases. Again, the pressure and flow oscillations are observed between the pump and the closed valve with high locked in pressures generated as the pump operates at it’s flow head.