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Pulsation Dampener - No Moving Parts Acoustic Pulsation Filter / Pulsation Diffuser

WaveGuard No Moving Parts / Acoustic Pulsation Diffuser
WaveGuard bladder-less, foam-less, no moving parts, fit and forget, service free pulsation dampeners. Prevent system response pulsations from amplifying and resonating with the forcing action.

This are PulseGuard WaveGuard Dampener View Sheets; sometimes called in error a "dimensional drawings" which it isn't because it is not to scale.

WAVEGUARDS
WaveGuards are pressure pulsation dampeners / pulsation diffusers. Waveguards are not flow fluctuation reducers. WaveGuards are not designed to address acceleration head, except to the extent to which the compressibility of the volume of liquid is helpful.

PURPOSE
To provide a pressure pulsation interceptor which does not overload a pump by the resistance of an orifice or series of orifices.

METHOD
Diffusion. A pressure wave, typically traveling at a kilometer per second - plus - in a liquid, will have a decreased amplitude when the time base is lengthened. The lengthening of the time base is sometimes referred to as turning a pressure incident into a spectrum of frequencies. When the path traveled by a pressure wave becomes multiple paths, each of a different length, as applies to the myriad of routs between the ceramic balls in a WaveGuard, the pressure amplitude of wave may be reduced because part of the peak reaches the other end spread over time.

APPLICATION
Generally reserved for frequencies near and above 1000Hz. in clean, non particulate carrying, liquids. Even used with slow running, say 400rpm, quintuplex pumps, where the cause of disturbance may be a 7 bounce valve action on short line length that quadruples the frequency Ex. Eg. 400x5x7x4/60= 932 Hz.

Pulsation dampener to dampen pressure pulsation where pressure is communicated Throughout the system at 1440 meters per second at high frequency and low Amplitude

Having no moving parts - aka bladderless - more accurately described as An "acoustic" diffuser type dampener. In principle - captures the pressure disturbances, and reduces their amplitude Without bouncing them back to source, by producing a spectrum of time taken for A pressure event to emerge, causes minimal pressure drop between inlet and Outlet. Typically applied to centrifugal and other high speed rotary pumps That produce frequencies at 250 hz and above.

Construction, having

1. Internals
an inlet comprising liquid entrance through multiple paths so arranged that pressure is communicated to the opposite end through a maximized, commensurate with liquid viscosity, number of pressure paths, emerging through a liquid exit through which all pressure paths converge.

2. Pressure bottles' housing / vessel for pulsation dampener - "snubber" - pulsation suppression device - acoustic damper
a. Comprising five parts, a damper "body" cylinder with one end integral or otherwise permanently partially closing said cylinder .
b. Said dampner cylinder wall thickness determined by the formula :-
design pressure x internal radius
thickness = ----------------------------------------------------------
allowable working stress x factor ( - 0.6 design pressure)

dampener design pressure being established by an addition, to max working pressure, of 10% - on the basis that a direct acting rv set pressure is 10% above max working pressure. Plus that said rv has a 15% accumulation pressure to fully open. *

in which the factor above is determined by the degree of surety of the cylinder wall being perfect, for example: a "snubber" seamless wall of hot rolled or drawn pipe, a punch forged cup, a forged billet machine bored to form a hollow, the factor is 1

a "suppression device" cylinder formed by any longitudinal welding or joining method the factor is 0,7 where there is a longitudinal joint that has been certified as free of all imperfections by X-ray, the factor may be 0,9

said "allowable working stress" for the dampner material being determined by the lesser of yield strength x 0,625 , or the ultimate tensile strength x 0,25. no allowable working stress shall be determinable unless the ductility of the material and any jointing is at least 20%
elongation at break. said dampener jointing procedure shall have been proven by root, side,
and cap bend tests. further assurance of a jointing method may also be indicated by X-ray,
but failure to pass tight radius bend tests is the only acceptable criteria for application to dampner manufacture because they are by definition for a cyclic stress duty,
hence ductility for the avoidance of work hardening is of paramount importance. *
nota bene : application of the European static pressure vessel weld procedures which allow only 14% ductility, and qualification by X-ray alone, is not safely useable in cyclic duty dampfner manufacture. *

both "yield strength" and "ultimate tensile strength" here in above, being taken from tables asme ii d, of issue not later than 1995 . note - allowable working stress levels established for vessels for static pressure duty, and published in codes that are not at least 20 year proven for cyclic duty, as applicable to "pulsation snubber - pulse dampers, dampners, dampeners - etc; said stress levels shall not be allowed. *

c. A second part of the acoustic dampener, being for retention, against dampener internal pressure, by an end plug within said cylinder, by means that can not be removed without first the depressurization of the cylinder; aka "tamper proof means" .

d. Said damper tamper proofing means so arranged that the seal of sealably located end plug will cause the escape of the seal at a pressure above 4x design pressure, and below destruction pressure - thusly ensuring "fail safe" *
goto "the pipehugger damper safety difference" .

e. Third part of "dampener by diffusion" , being the end plug referenced above, having a thickness not less that 3,5 times the minimum necessary wall thickness of the cylinder, and with seal to the next component.

f. Fourth diffusion dampener component being, the system connection of a design that requires removal of said system component, before tamperproof means can be disturbed.

g. Fifth component being typically balls, of ceramic or other suitably corrosion and erosion resistant material, or can be chain, but in all cases packed tightly into the cylinder, so that when the end plug is installed this fifth component can not move.

Generally
a. Dampeners as shown in the accompanying cross sectional / cut view
b. This pulsation suppression device bearing a stainless steel data plate, stamped with the vessel / shop / work order number, that enables the trace ability to file containing all materials and physical property certification.

Features
a. Sufficient volume of liquid, which when computed by its compressibility, is adequate to enable the discharge from a specific pump to deliver its liquid flow in a fluctuating manner without generating not more than a specified amount of acceleration head with the damper acting as an accumulator.
b. So arranged that - without additional cost - pressure pulsation is intercepted by the damper in order to isolate the forcing action of a pump, or valve, from the acoustic response of a system to the residual pressure change.

* Customer may specify solely of their own choice and advisability the use of pressure rating called "P max"

Pressure Pulsation Diffusers / Filters / Dampeners With No Moving Parts
Pulsation Frequency Reduction Type
No Moving Parts Fluid Phase Change Type
Fluid System Pressure Pulse Dispersal Type
Pulse Intensification and Dissipation Type
Viewsheets:
No Moving Parts Acoustic Pulsation Filter
In Line Through Flow Pressure Wave Interceptor
Ram Jet and Helmholtz Orifice Type
System Suction Cavitation Preventor


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