Hydraulic Accumulators

Surge, Diaphragm, Piston, and Bladder Types

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Shock, Surge, and Water Hammer:
Installation, Operation, and Maintenance

Installation Modes   |   Scheduled Maintenance   |   Pre-Fill Cushion Pressure






INSTALLATION MODES

Method of installation depends on the application.

 

1. For pulsation dampening with duplex plunger pumps.

Well fracturing and slurry pumping.

Pumps used for increased oil production by hydrofracking (well fracturing), open up fissures in the rock strata with pressures as high as 25 thousand pounds per square inch; and, keeping the layers apart with injected sand particles.

Slurry Pumping
Lower pressure versions of these duplex (two plunger pumps) frequently used for the transmission of slurries, tailings, and in the mining production of metal ores in the drive for valuable commodities.

For further details on this specialist type of duplex pump: See the Geho company of Egtenrayseweg 9; a subsidiary of Wier mining and minerals.

 

2. For pulsation interception from triplex plunger pumps.

Place the unit that is to act as a pulsation interceptor on a piping base with diverter flute that is positioned no more than 12 diameters of the pipe, away from the outlet of the pump discharge manifold.

 

3. Valve closure shock prevention.

Place the unit that is to act as a shock preventer - water hammer absorber, no more than 12 pipe diameters of the pipe away from the fast closing valve that causes the hammering.

 

4. Pump startup surge reduction and stopping "back-flow bang".

Install the equipment that will enable the pump to start up without having to surge the pressure by placing it within 12 pipe diameters of the pump discharge valve. Similarly to decelerate the back flow towards the pump, place the deceleration volume close to the pump check valve.

 





SCHEDULED MAINTENANCE

An indication of need for service is a loss of cushion gas pressure.
Maintenance schedule depends on the application:

 

1. For pulsation interception from triplex plunger pumps.

The life of the moving component parts of SurgeGuard, JumboFlex, LiquiBello, and FloatOlator alleviators is dependant on the cyclic duty. For example if the pre-fill cushion gas pressure is set too high, then the moving part will "bottom" by fully exhausting after each pulse. If the pre-fill is set too low, then the moving part will be over deflected. Each user sets their own norms, but unless otherwise advised, aim for six months. Spares should be ordered with each unit.

 

2. Valve closure shock prevention.

The life of the moving component parts of SurgeGuard, JumboFlex, LiquiBello, and FloatOlator alleviators is dependant on the cyclic duty. How often the fast closing valve is "slammed" dictates how much work a water hammer preventor has to do, but if the size of the "absorber"/"attenuator" is large, the frequency of service is not likely to be more often than once per anum. It is the end user responsibility to establish. Spares should be ordered with each unit.

 

3. Pump startup surge reduction and stopping "back-flow bang".

The life of the moving component parts of SurgeGuard, JumboFlex, LiquiBello, and FloatOlator alleviators is dependant on the cyclic duty. The number of pump "start-ups", "shut-downs", and how violent they are will set the time between strip and rebuilds. This is not normally more than once in three years. Responsibility for setting that schedule is with the end user. Spares should be ordered with each unit.

 

 

 





PRE-FILL CUSHION PRESSURE

Pre-fill pressure depends on the application.

1. For pulsation interception from triplex plunger pumps.

With SurgeGuard, JumboFlex, LiquiBello, and FloatOlator if the pre-fill cushion gas pressure is set too high, then the moving part will "bottom" by fully exhausting after each pulse. If the pre-fill is set too low, then the moving part will be over deflected. A "high pre-fill pressure", 80% of the steady state line pressure is used for volumetric dampening - reducing acceleration head generation for acoustic pipe resonance a low pre-fill pressure - 50% of line pressure is used. Please always provide a full set of system pressure readings when requesting a manufacturers reccomendation.

2. Valve closure shock, water hammer eliminators.

With SurgeGuard, JumboFlex, LiquiBello, and FloatOlator installed as a pipe shock water hammer preventer, the normal starting point is to pre-fill the alleviator to 70% of the normal pressure that is in the pipeline before the valve is slammed closed. Depending on pipe length and compressibility - acoustic velocity in some systems may be quietened by fine tuning cushion pressure

3. Pump startup surge reduction and stopping "back-flow bang"

With SurgeGuard, JumboFlex, LiquiBello, and FloatOlator pump start-up surge attenuators and backflow shock alleviators, the pre-fill pressure is generally as low as only 30% of the theoretical steady state line pressure reached when pumping. A low prefill cushion allows the unit to begin to accept flow shortly after the pump starts, sp preventing acceleration head surge. An indication of a need for service is a loss of cushion pressure.

 

 

 

 

 

 



Offshore Oil & Gas Applications Surge Accumulators Pulsation Dampeners Bladder Accumulators

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Surge, Diaphragm, Piston, and Bladder Types

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