Hydropneumatic Pulsation Filters[edit]
Purpose[edit]
To provide means of reducing the amplitude of pressure changes the velocity of which is in the order of 1.4 km/s. All are used in industry.
Characteristics[edit]
Pressure container with separate inlet and outlet, connectable to a pipe system so that all pressure changes must attempt to pass through said chamber. Entry and exit of said chamber being of a diameter relative to chamber diameter that provides a high discharge coefficient, and without close proximity of any reflective surface. Lack of any sudden change in cross section area of flow path that would reflect a pressure wave, i.e. no orifice plate(s).
Applications by frequency response[edit]
For pulsation above frequency 100 Hz (i.e. for high speed pumps and all pipe systems shorter than say 80 yards): no moving parts devices. For pulsation frequencies below 100 Hz: certain moving parts devices of known membrane response characteristics.
Variations[edit]
Combination “dual purpose” devices addressing “acceleration head reduction” see 4. below by means of a gas containment plus characteristics 3.2 above.