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Pulsation Dampener Performance Checking Required Pulsation Dampener Performance Pulsation Dampener Performance

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
pulsation dampeners to stop pump parts damage
RELIEF VALVE WEEPING STOP WEEPAGE FATIGUE CRACKING OF BURST DISKS KEEP PRESSURE VARIATION LESS THAN 9%
pulsation dampeners to stop gauge damage STOP GAUGE DAMAGE BEFORE AFTER GAUGES DON’T READ PULSATION SPRINGY BOURDON TUBE, RACK & PINNION Wag at their own natural frequency WITHOUT VIBRATIONS YOU READ AVERAGE STEADY STATE PRESSURE KEEP PRESSURE VARIATION LESS THAN 6%
pulsation dampeners to prevent incomplete atomization
MEDIUM DAMPENING
pulsation dampeners to make mag meters usable
pulsation dampeners to stop paddle wheel meter surging
pulsation dampeners to stop turbine screw meter racheting TURBINE  SCREW  METER  “RATCHETING” WEIGHT OF SCREW BLADES & 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
pulsation dampeners for coriolis
pulsation dampeners for vortex shedding NO NON-SENSE VORTEX SHEDDING WITHOUT PRESSURE PULSATION “VORTEX SHEDDING” METERS WORK GO LESS THAN 0.75%
pulsation dampeners with sharp edged orifice
MECHANICAL DAMAGE PROTECTION
pulsation dampeners for mechanical damage protectionPipe 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. A nomogram - or "3 axis Graph" - to help you specify allowable residual pressure fluctuation has been included.

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%.

STOP PUMP PARTS DAMAGE GEAR TOOTH WEAR, CHATTER, AND FRACTURE DRIVE BELT SLIP, BURN-OUT, AND BREAK-UP KEEP PRESSURE VARIATION LESS THAN 12% INCOMPLETE ATOMIZATION Stop Globlets, Drops & Squirts -when you want a fine spray- Depending on viscosity and nozzle design IMPROVE STATIC MIXING Pulsed in - Un-mixed out MAKE MAG. METERS USEABLE STOP PADDLE WHEEL METER SURGING Erratic Jerks CORIOLIS DELTA P METER

PulseGuard Pulsation Dampeners - print image Checking Required Pulsation Dampener Performance PDF



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