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• Dampener Drawings and Animations
  • Flow Through Flexible Elastomer Tube
  • HP System Liquid in Elastomer Membrane
  • LP System Liquid in Elastomer Membrane
  • Precharge Gas in Elastomer Bladder
  • High Pressure FlexFlon PTFE Diaphragm
  • Low Pressure FlexFlon PTFE Diaphragm
• Pulsation Dampeners
  • PTFE Diaphragm / Teflon Membrane Types
    • AODD Pump Dampeners with Plastomer Diaphragm
    • Diaphragm Metering Pump Dampeners with Plastomer Diaphragm
    • Hose Pump Dampeners with Plastomer Diaphragm
    • Lobe Pump Dampeners with Plastomer Diaphragm
    • Low Pressure Dosing Pump Dampeners with Plastomer Diaphragm
    • Multi Diaphragm Metering Pump Dampeners with Plastomer Diaphragm
    • Packed Plunger Pump Dampeners with Plastomer Diaphragm
    • Progressive Cavity Pump Dampeners with Plastomer Diaphragm
    • Vane Pump Dampeners with Plastomer Diaphragm
  • Elastomer Bladder / Flex-Tube Types
    • Flex-Tube - Acceleration Head and Interception Type
    • Nitrogen Gas in Elastomer Bladder Type
    • System / Process Liquid in Elastomer Bladder Type
  • Acoustic / No Moving Parts Types
    • Frequency Reduction Type
    • Phase Change Type
    • Pulse Dispersal Type
    • Pulse Intensification then Dissipation Type
• Pulse Dampening, Safety, Applications
  • Snubbing, Surge Suppressors, and Shock Absorbing
    • Flow Fluctuation / Suction Systems - 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
    • Dampener Flow Smoothness Requirements
  • Pressure Pulsation Dampener Safety
    • Checking Dampener Pressure Rating Safety
    • Checking Required Pulsation Dampener Performance
    • Pre-Filling Dampeners with Nitrogen Cushion Gas
    • Pre-Filling Pulsation Dampeners at Elevated Pressures
    • Pre-Filling Pulsation Dampeners with Pin Core Valves
    • Safe Levels of Pulsation for Preventing Fatigue
    • Dampener Safety and Gas Overload Protection
    • Pulsation Dampener Safety and Liquids
    • Pulsation Dampener Safety and Piping
    • Pre-Filling Pulsation Dampeners with Strut Valves
  • Pulsation Dampener Applications
    • Shock Alleviation / Multi-Head Interaction
    • Double Layer, 2 Sheet PTFE, Diaphragm Metering
    • Flow Fluctuation Smoothing
    • Suction Problems with High Pressure Systems
    • Packed Plunger / Piston Pumps
    • Packed Plunger / Piston Pumps 2
    • Peristaltic and Tube or Hose Pumps
    • Plastic / A.O.D.D. Pump Systems
    • Pressure Pulse Dampening
    • Test and Injection Systems
• Dampeners by Pump

Pulsation Dampening - Dampener Flow Smoothness Requirements

The characteristics of the dampener depend on the data for the pump system and what level of "smoothness" performance (see below) your require. Below are generally accepted levels of residual fluctuation percentage allowed, to protect against the average level of the problems listed.

COARSE DAMPENING MEDIUM DAMPENING FINE DAMPENING MECHANICAL DAMAGE PROTECTION Pipe Shake, Fatigue, Weld Cracking, & Over Stress Unions, Flanges, & Fittings. The level of allowable pressure pulsation, depends on three factors: 1. Diameter of pipe. 2. Operating Pressure. 3. Pulse Frequency.

Coarse Dampening

Stop pump parts damage.
Gear tooth wear, chatter, and fracture. Drive belt slip, burn-out, and break up. Cross-head, rod, and yoke deflection.
Keep pressure variation less than 12%.
Stop weepage.
Relief valve weeping, surges causing premature lift, fatigue cracking of burst discs.
Keep pressure variation less than 9%.
Stop gauge damage.
Gauges don't read pulsation. Springy bourdon tube, rack and pinion wag at their own natural frequency, without vibrations you read average steady state pressure.
Keep pressure variation less than 6%.
Incomplete atomization
Stop goblets, drops and squirts when you want a fine spray.
Keep pressure variation less than 5%.

Medium Dampening

Improve static mixing.
Keep pressure variation less than 4%.
Make mag meters usable.
Keep flow-fluctuations less than 3%.
Stop paddle wheel meter surging.
Keep pressure variation less than 2%.
Turbine screw meter "ratcheting".
Kick from pulse starts the spin, weight of screw blades and shaft keeps it spinning, next kick gives overspeed or stops it. Soon you have no accuracy.
Stay less than 1.5% depending on viscosity.

Fine Dampening

Coriolis
Loop tube 90Hz or straight tube 900 Hz. Hit a multiple or divisor of, or that frequency, and the tubes swing wildly. They can register 100 Kilos/sec when you only have 5.
Stabilize to less than 1.0%.
No non-sense vortex shedding.
Vortexes are minute low pressure zones and are created at a rate relative to flow velocity. Without pressure pulsation "vortex shedding" meters work.
Go less than 0.75%.