PulseGuard

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Pulsation Dampener - Flow Through Tube for Viscous Liquids / Slurries

PumpGuard Clear-Flo Elastomer Flex-Tube Pulsation Dampeners

This a PulseGuard "PumpGuard" Pulsation Dampeners View Sheet; is erroneously called "a dimensional drawing", because it is not necessarily to scale.

DESIGN PURPOSE
1. To Provide pulsation dampeners that have 3" through 14" diam. connections.
2. To provide with 1. (above) dampeners with stainless steel liquid contact metal parts at minimal cost.
3. To provide with 1 & 2 (above) combined pulsation and flow fluctuation attenuating capability with a straight line "clear-flow" path from in to out, suitable for sludges, slurries, suspended particulate, and "food" liquids.
4. To provide, with 1, 2, & 3, (above), for the use of low cost "vessel" outer, non liquid contact, carbon steel "vessel" housing shell.
5. To Provide with 1. 2. 3. & 4, (above) a pulsation dampener design capable of working at negative pressures without "hemorrhoiding", as well as use at elevated pressures.
6. To provide with 1, 2, 3, 4, and 5, (above) use in flanged systems with ease of "as a spool piece" removal for easy cleaning with a lance.

DESIGN DETAILS See also - Click here to GOTO "The difference is in the detail"

ENDS
The ends are machined in accordance with ANSI B16.5 or EC "DN-PN" norms. having the flange face in corrosion resistant material. Provided with threaded stud bolt holes. Socket head cap screws are equi-spaced between holding the end cover plate item 1 to the end plug item 2, which is retained by the segmental lock ring item 9.

FLEX-TUBE "Bladder"
Integral seal ends enable sealing by push in tubes apart of stainless flange face component. This is preferable to leaking hose clamps. Thickest point (6 on inset detail) prevents both suck in, and blow out into the corner between end plug and shell. The flex tube support option that is perforated and has an internal cross, "collapse preventor", allows use with high per-fill pressures.

FLANGE FACES
The standard flange end is determined by the diameter of the PumpGuard. The are larger flange face optional extras. Ess also, GOTO Pug/LRF and Pug/XLRF

SPECIALS
There are food, drug, and beverage, specials, click here to GOTO Pug/F&D

Pulsation dampener for systems containing high viscosity or sludge and Slurry liquids.

Four variants
A). For no prefill cushion at all - uses permacushion foam .
B). For 0.5 bar to 3 bar cushion prefill cushion, uses no internal perf-tube support. Completely "clear-flow" .
C). For pre-fill cushion n2 pressure above 5 bar up to 70 bar - having internal flextube support by perf-tube .
D). Only for liquids containing no particulate, a combination design, uses perftube packed with balls as in the waveguard pressure transient dispersal design. No limitation on pre-fill cushion pressure.

All variant designs use elastomer flextube "bladder" - to take liquid inside, And having corrosion resistant liquid wetted metal parts. Aka suction and discharge "dampners" -outlet "bottles" - pulsation suppression Devices.

Construction, having
1. Dampener flex-tube bladder membrane of elastomer
a. Epdm, nitrile, hypalon, fluorocarbon or 20 other elastomers
b. That has been cross-linked by temperature, using cross linking plasticizer, that does not leach out.
c. With a surface area substantially the same as the vessel housing up to which it will swell by an increase of liquid pressure which feature prevents 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 "thickened ends to prevent hemorrhoiding" .
e. Alignment of pre-fill cushion gas inlet - outlet point, with the anti- extrusion thickened ends, so that neither failure to pre-fill, nor pre-fill with cushion gas to too low a pressure does not cause damage by the forcing of the flex-tube into the cushion connection point.
f.
g. Pulsation dampener flex-tube "bladder" peripheral end seal located within a groove in the damper end plug on the gas side.
h. Flextube end seals being caused to take effect by the insertion of tapered rings, said rings normally being integral with a "raised face", as of a flange.
i. Adjacent to & inward of said end seals, membrane wall being thinned, enabling flexing prior to thickened section that prevents hemorrhaging .

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 surity 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. 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 "segmental lock ring 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, manufactured from carbon steel pvq plate to sa grade gr. .

g. End plug having a central hole sized for the capture of the flextube end

h. Cylindrical housing to contain n2 cushion gas, of sa 106 of grade gr 60 unless for low temperature application .

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 traceability to file containing all materials and physical property certification.

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.

Pulsation Dampeners with Elastomeric Membranes or Flexible Tubes
Flow Through Tube for Slurries and Semi Solids
Viewsheets:
Flow Through Tube for Viscous Liquids / Slurries
Flanged Tube for Viscous Liquids / Slurries
Large Flanged Tube for Sludges / Semi Solids
Sanitary Hygienic Tube for Clean Particulate Flow


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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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