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Pulsation Dampner for Flow Fluctuation and Pressure Pulse Interception

PulseGuard Pulsation Dampner
Pulsation dampner for flow-fluctuation removal and pressure pulse interception. Standard inventory dual use configuration.


CAUTION: Generally called a "dimensional drawing" this is a PulseGuard viewsheet. The length to diameter ratio(s) are not to the same scale.

CLOSE COUPLING
Close coupling ensures a minimum volume to be accelerated between the "store" within the liquid bladder, and the pump chamber where it has to enter within a split second.

ORIENTATION
This 45 degree, liquid side uppermost, twin 45 degree bends, orientation enables the interception of negative pressure waves that will otherwise travel back up the suction supply line and break the liquid column into slugs, with then further decrease volumetric efficiency.
Liquid side up ensures that there is no bubble collection which would then cause intermittent supply gas "knock".

Medium & low pressure pulse dampeners using elastomer bladder

to take liquid Inside, and having corrosion resistant liquid wetted metal parts. Aka "dampners" or suction "bottles"

Construction, having:

1. Pulsation damper bladder membrane
a. From epdm, nitrile, hypalon, fluorocarbon or 20 other elastomers
b. That has been cross-linked by temperature, using cross lining plasticizer, that does not leach out.
c. Having a surface area substantially the same as the vessel housing against which it will be unrolled by liquid pressure increase. this to prevent undue stretching and in the event of pumping without first pre-filling with cushion gas
d. Membrane (c. Above) provided with means to prevent the extrusion thereof into port or ports provided for liquid flow. Said prevention of extrusion provided by parts aka "anti-extrusion plate"
e. Anti-extrusion plate located and attached to said membrane in such a manner that flexing movement of membrane does not pull on nor cause the plate to hang loose, and so move off center line.
f. Said damper anti-extrusion plate also prevented from allowing premature liquid port closure; such premature closure means provided by "tension webs" on pre-fill side of molding. Tension webs hold bladder center concave to the liquid side providing a stabilizing "nest" for plate.
possibility of bladder being damaged by forcing against the gas pre-fill port by the desidue from the injection point sprue runner.
g. Pulsation dampeners bladder periphery sealably located within a groove within damper end plug inner side circumference.
h. Peripheral location of said membrane in on the end plug in such a method that by means of an integral corner filling ring

2. Pressure bottles' housing / vessel for pulsation dampener - bottle "snubber" pulsation suppression device - accumulator:
a. Comprising two parts, a damper "body" cylinder with one end integral or otherwise permanently closed, and having the opposite end of said cylinder open, then sealably closed by a plug of generally 3.5 times the thickness of the cylinder wall.
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. *

c. Retention, against dampener internal pressure, of said 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. Having pulsation dampener pre-fill cushion gas filling and venting point that enables both without the use of any special tools. Typically said filling and venting being operable to open and close with a 3/4" af wrench.

f. Said end plug of the dampener acting as liquid end of housing, manufactured from stainless steel to sa 240 grade 316/316l but containing no "titanium kill". Or appropriate corrosion resistant material to customer specification.
g. The above liquid end plug with the liquid to be dampened, inlet and outlet means adaptable to the separation between said inlet and said outlet.
h. Cylindrical housing to contain n2 cushion gas, of sa 106 or billet, or forged bar similar material (gr 60 unless for low temperature application)

Features
a. Sufficient compressible gas volume of the damper 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
b. So arranged that - without additional cost - pressure pulsation is intercepted by the dampers in order to isolate the forcing action of a pump, or valve, from the acoustic response of a system to the residual pressure change.
c. Improved dampener in place flushibiliy, greater first in first out performance for more constant temperature, more suitability for fluids that require constant agitation.
d. Also for suction mass acceleration head loss, and preventing negative pressure spikes from instantaneous suction valve opening, from traveling the suction supply line.

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

Pulsation Dampeners with Elastomeric Membranes or Flexible Tubes
System Liquid in Elastomer Bladder Type
Viewsheets:
Pulsation Dampners for Flow Fluctuation and Pressure Pulse Interception
System Liquid in Bladder Connection Options
Compatible Plastic Wetted Contact Parts
Multiple Plunger / Multi Flow / Sanitary
HP Flow Through Hubs / Base Blocks
Single Connection Flange Face or Threaded
Large Integral ANSI B16.5 Flange Face
Large Flange Connection and Piping Base
O Face plus Piping Base Block / Manifold
O Face plus Piping Base / Port Divider
With Non-Metallic or Wetted Parts


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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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