Pulsation Filtration - No Moving Parts and Hydropneumatic Pulsation Filters

Pulsation Filtration Devices - Pulsation Dampeners / Pulsation Diffusers

1. Purpose:
To provide means of reducing the amplitude of pressure changes. Pressure changes have a velocity in the order of 1.4 km/Sec. At frequencies, due to pipe lengths less than 50 meters. Said frequencies being generally greater than the proven response capability of small diameter gas bags that are long.
Method: By interception of the pressure waves, then their dissipation and or dispersal.

2. Characteristics:
Pressure container with separate inlet and outlet, connectable to a pipe system so that all pressure changes must attempt to pass through said chamber.
Link to the graphic “box with pressure waves inside” part of ex LDi page within site.
Entry and exit of said chamber being of a diameter relative to chamber diameter such that a high discharge coefficient is provided, and said entry and exit not having 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 / or plates. Link to the graphic 7 degree taper part of ex LDi page within the site.

3. Applications by frequency response :
For pulsation above frequency 100 Hz., I.E. for high speed pumps and all pipe systems shorter than say fifty meters; no moving parts devices. For pulsation frequencies below 100 Hz., certain moving parts devices of known membrane response characteristics.
Selection:
A. Above 50 Hz and below 250 Hz Go to Ram-Jet
B. 250 Hz. and above Go to Ball-Pack
C. Random high frequencies Go to Combination
D. Below 50 Hz Go to Elastomer or Plastomer

4. Variations:
A. “Ramjet”, 7 degree included angle tapered tube. Directs pressure wave into decompression chamber without wave reflection, explodes the wave, deadens by mass of liquid. No moving parts. aka “Bladderless”.
B. “Ball pack” Dispersal - also aka “Bladderless High Frequency”
C. “Combination” Combination of a. and b. above
D. “Dual purpose” devices, Combining a. above, and addressing “acceleration head reduction” (please see associated text Go to Acceleration Head Reducers) by means of a gas containment, has characteristics 3.2 above. + Having membrane and gas pre-fill. Pre-Fill is normally set at 50% of system theoretical steady state pressure to provide deadening liquid volume and to keep membrane away from porting, so that it can not act as a reflector.

Pulsation Dampeners - Snubbing, Surge Suppression and Shock Absorbing
Hydropneumatic Device for Acceleration Head Pulsation Prevention
No Moving Parts and Hydropneumatic Pulsation Filters
Flow Fluctuation / Suction Systems - Negative Pressure Pulsation / Supply Lines
Pressure Pulsation Pulse Signatures
Pressure Pulsation Dampeners for Transients and their Interception
Pulsation Dampeners for Amplitude of Pressure Wave Spikes
Pulsation Dampeners and Pump Vendor Responsibilities
Acceleration Head / Pressure that a System Could Create
Pulsation Dampening - Flow Smoothness Requirements
Pulsation Dampener Quick Release Manifolds / Flow Divider Manifolds

Pulsation-Dampeners.com
Index | Selection / Quotation | Contact Information

Click on the picture of the damper below to see how it works and is assembled, animated.