PULSATION DAMPENERS AND SURGE SUPPRESSORS

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Sentry Pulsation Dampeners and Surge Suppressors are hydraulic shock absorbers. Hydraulic shock is caused by rapid acceleration or deceleration of the liquid.

	The metering of fluids is critical in maintaining control of quality and material usage. A SENTRY PULSATION DAMPENER installed at the discharge of a reciprocating pump eliminates the pulsating flow, allowing the meter to respond to a steady flow, insuring its accuracy, protection and longevity.
	Quick closing valves create dangerous pressure surges during operation. When fluid velocity is stopped, it is transformed into pressure energy, causing a pressure spike up to six times greater than operating pressure - valves are destroyed, piping is ruptured, and sensitive instrumentation is damaged. A SENTRY SURGE SUPPRESSOR, placed upstream as close to the valve as possible, will absorb dangerous pressure spikes.
	Filter screens are susceptible to breakdown due to fatigue and "stretching" from pulsations. Pulsating fluids will loosen and eventually tear apart filter media. In addition, pulsating pressure spikes will enlarge the flow holes in the media and allow larger than acceptable particles to pass. A SENTRY PULSATION DAMPENER placed at the pump discharge will create a steady pressure and constant flow against the filter media to ensure longer media life and particle size integrity.
	At pump start up, the fluid in a pipeline must be accelerated from zero to operating velocity. When the initial pump surge comes into contact with the static line fluid, pressure spike is created. The force of this "water hammer" will rupture pipes, break pipe fittings and destroy instrumentation. A SENTRY SURGE SUPPRESSOR installed at the pump discharge will absorb the initial fluid surge, then discharge the accumulated fluid as the pipeline achieves a steady flow.
	Suction stabilization is critical to a pump's efficiency and in preventing cavitation. Cavitation will result in premature failure of pump components including seals, packing, plungers and diaphragms. A SENTRY SUCTION STABILIZER installed at the pump inlet will control the pressure fluctuations and acceleration loss which lead to cavitation. With a suction stabilizer, the pump will always have a full volume stroke.
	Coating, spraying and curtain coating applications benefit with the addition of a SENTRY PULSATION DAMPENER placed directly at the discharge of a reciprocating pump. A pulsating pump creates an uneven fluid flow to the coating or spraying process. The uneven application of material can result in rejected product and overuse of coating materials, both resulting in lost profits.
	Back surge occurs when a pump is required to pump vertically or over a rise. At pump shut down, the fluid reverses directions and gains velocity as it travels back toward the pump. As it hits the pump or the pump's check valve, the fluid is stopped and a dangerous pressure spike is created. A SENTRY SURGE SUPPRESSOR placed at the pump's discharge or check valve absorbs the pressure shock, saving the system from damage.
	Thermal expansion of fluids in a closed system can result in dangerously high pressures, which lead to ruptured pipes and fittings, destroyed in-line instrumentation, burst pressure relief valves and contaminated surroundings. A SENTRY THERMAL EXPANSION CHAMBER placed in line will accumulate the expanded fluid, reducing the increase in pressure.

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Brochures:

General Overview
Revolution Series - Plastic dampeners without fasteners.
Aluminium Dampeners - Large capacity.
XP Series - High Pressure Dampeners.
CIP - "Clean in Place" Food Service Dampeners.
Sanitary Series - For clean and hygenic applications.
Inlet Stabilisers - For the suction side of your pump.

Frequently Asked Questions

Do Pulsation Dampeners comply with AS1210 - Pressure vessels?

AS1210-2010, Clause 1.3 Application says....

"This standard is not intended to apply to"........"and other plant under pressure excluded by AS/NZS1200."

AS1200-2000, Appendix A3 Equipment or plant under pressure not specifically covered in Item 15 says....

"Hydraulic actuated equipment, including inert gas type 'dampers' in which the product of pressure (MPa) an gas volume (L) does not exceed 30 MPa.L."

So the answer is that the majority of pulsation dampeners do not have to comply with AS1210 as they are excluded from the scope.

O&M manuals for Pulsation Dampeners:

Case Studies:

Fluid Power:

Hydraulic Accumulators

DVD Extra's - These will load ONLY from a DVD - CLICK HERE to request a DVD.
Metering Pumps	Dampening for Metering Pumps? Watch the video!
Peristaltic Pumps	Dampening for Peristaltic and Hose Pumps? Watch the video!
Diaphragm Pumps	Dampening for Air Diaphragm Pumps? Watch the video!
Inlet Stabilisers	Pump Inlet Stabilising? Watch the video!
Control Types	Dampener Control Types. The video explains.
Slurries	Slurry Applications - See the video.
Water Hammer	Water Hammer Control. The video explains.
Spraying and Coating	Spraying and Coating Applications? Watch the video!
High Pressure	High Pressure Applications? Watch the video!
Sanitary	Sanitary Applications. See the video.
Pulsation Dampener Sizing	Pulsation Dampener Sizing Spreadsheet - Metric Units!

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H2O Rx

PO Box 748

Lane Cove NSW 1595

Australia

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+61 409 784 236

+61 2 9436 0491

info@h2orx.com.au

www.h2orx.com.au

97 217 924 685

Last Updated: 15 January, 2012