Accumulators absorb hydraulic shocks and dampen pump pulsation and flow fluctuations.

Typically an accumulator is a device similar to a surge tank at a given pressure. It acts like a shock absorber in a hydraulic system.  For example, an accumulator may be placed on the discharge of a positive displacement pump to keep the system pressurized when a valve is opened.

To model an accumulator in PIPE-FLO, install a pressure demand with the set value equal to the accumulator set pressure.