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Fluid Flow Control Animations
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Pulsation Dampeners - Snubbing, Surge Suppression and Shock Absorbing

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

Pressure

Pulsation dampeners dampen pulsation. Pulsation is repetitive pressure change, and is expressed as pressure amplitude at frequency. Normally this is ---- psi peak to valley at --Hz. or --Kg/Cm2 peak to valley at --Hz.
Pulsation is also expressed as a percentage variation on a theoretical steady state norm.
Example: 400 Bar +-12%, meaning typically the pipe system response to a triplex pump at nominally 6000psi with pulsation from 5300psi to 6700psi.

As pulsation is expressed in terms of pressure, it is necessary to have the fundamentals of pressure. Pressure, or force, is transferred from place to place in an average liquid, at a velocity of 3500mph or say 1400 meters per second. That is similar to saying that a change to pressure at one place in a system, can not be detected a mile away until a second later. Another way to think about the speed of pressure wave transfer is that it about twice as fast as a bullet. Relative to the speed in air, we can say it is Mach 5.

On the above irrefutable firm foundation, we can agree that a pressure transient is not going to be adjacent a branch line for more than a fraction of a nanosecond. Further more it must be almost impossible to address these phenomena unless they are physically intercepted. You have therefore established that to address pressure amplitude at frequency, - or - "to dampen pressure pulsation" you must have an "in-line" "flow-through" multi connection - "an in and an out", pulsation dampener. In addition, as most of the gas bags in volume "accumulators" begin to suffer from phase lag above 10 Hz - (100 millisecond response time) there is not a snowballs chance in hell, that a gas bag (nitrogen "bladder") accumulator can be a "Pulsation Dampener". .::RESPONSIBILITY::.

Liquid Dynamics Pulsation Dampeners Information For more information, some pages from Liquid Dynamics on:
A) Pressure pulsation transients and their interception. B) Amplitude of pressure wave spikes.

Pulsation Dampeners - Pressure vs Flow

Flow

On the other hand, flow is slow, flow fluctuations are very slow, say 15 MPH / 24 KPH. About one three hundredth of the speed of pressure. Therefore flow fluctuations can easily be accumulated and discharged before the next flow fluctuation. Flow fluctuation is not pressure pulsation.

When the source of pressure pulsation, is "acceleration head"; that is to say, the extra force necessary to accelerated a mass of liquid in a system up to a new velocity, then by providing an accumulator that can accept the flow fluctuation, the mass of the system is not accelerated. Flow fluctuation in the system does not happen, acceleration head pressure change does not happen, so pressure pulsation is prevented. Pressure pulsation that does not occur is not being "dampened" . Volume accumulators are therefore not dampeners. Dampening pressure pulsation is not pressure pulsation prevention.

Dampening is the removal of excess pressure energy; Dampening is the dissipation of pressure pulsation.

Pulsation that exists will be dampened, flow fluctuation that is prevented from occurring by accumulation can not be dampened. Flow fluctuations are made into pressure pulsation by the resistance of the system to flow. These system characteristics are the cause of acceleration head pressure pulsation generation.

When a source of flow fluctuation has been accumulated and thus prevented from causing pressure pulsation,
then pulsation from that source cannot be dampened because it does not exist. .::RESPONSIBILITY::.

Liquid Dynamics Pulsation Dampeners Information For more information, some pages from Liquid Dynamics on:
A) Estimating how much acceleration head / pressure your system could create without a dampener.



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