Abstract:

ESDU 84038 gives a graphical method for estimating the maximum and minimum surge heads, following pump trip, at four points in a single pipe discharge line. Plotting those results on a blank chart provided and comparing the heads with the head profile of the pipeline assists in interpreting the results to establish regions of concern. The effects on the surge heads of altering the system parameters such as pump inertia or flow rate are readily studied. If the pipeline needs protection, data are given to enable the size of air vessel, situated just downstream of the pump, to be selected. A practical worked example illustrates the use of the methods.