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Accumulators

Accumulators are pressure vessels with an integrated bubble or diaphragm which separates the gas zone (usually N2) from the liquid zone. Their function is to store liquid under pressure e.g. in the pressure retaining unit of a buffer fluid unit. The useful volume of liquid is conditional on the permissible pressure differential. Calculation formula: Isotherm (n = 1)

V = V0 · -

V = useful volume (1)

V0 = nominal volume of the accumulator (1)

p0 = gas preload pressure (bar abs.)

p1 = min. working pressure (bar abs.)

p2 = max. working pressure (bar abs.)

Bubble accumulator:

 

1 Bubble filled with nitrogen, liquid valve closed.

2 Minimum working pressure. Small volume of liquid (approx. 10% of nominal volume) in the accumulator.

3 Accumulator at maximum working pressure. The change of volume is equal to the volume of liquid: DV = V1 - V2.

Diaphragm accumulator:

 

1 The diaphragm filled with nitrogen adopts the inner contour of the accumulator.

2 Position with minimum working pressure. Small volume of liquid in the accumulator.

3 Maximum working pressure. The change of volume is equal to the useful volume of liquid: DV = V1 - V2