The objective of the Surge analysis is to ensure that the pressures in the piping network are within the acceptable criteria for most severe cases of surge scenarios.
The acceptable criteria are as below:
Max. Pressure: in the pipeline at any time and at any point shall always be less than the rated pressure of the pipeline.
Min. Pressure: The pressure inside the entire pipeline on the discharge side of the pump house shall not become negative at any point of time during any transient event. At the suction side of the pump, cavitation’s shall not happen.
Some of the common cases of Surge analysis are: Pump Shutdown & Pump Start-up event.
The pipeline has generic pipeline components like valves, area change, expansion joints, elbows, tee junction etc. The information of the component locations is determined from the given AutoCAD drawings.
These drawings were used to create piping layout in the model for the surge analysis software. The components are appropriately modeled accounting for their loss coefficient and elevation.
Pump data, pipe properties along with boundary conditions such as pressure drop and various other components like fittings, valves, bends, elbows, tees, inlets, expansion and contraction are modeled as junction with elevation and pipes.
Pressure contours in complete network.
Comparison of Pressure inside the pipeline with Vapour Pressure.
Hydraulic grade and Air/Vapor volume near to pump discharge/suction side.
Graphs near to Pump to show Pressure gradient / peak during shut down and start-up condition.
