Reciprocating pumps often suffer from pulsation problems on both the suction and discharge side. Many of the problems can be traced to poor suction conditions where the pressure at the inlet to the pump is less than that required by the pump manufacturer. 

The suction pressure available at the inlet to the pump is often referred to as either NPSHa (Nett Positive Suction Head available) or NPIP (Nett Positive Inlet Pressure).

Fitment of a Flo-Dyne Suction Stabiliser at the pump suction will eliminate all NPSH problems and ensure a smooth running pump. For maximum effect the suction stabiliser may be combined with the Flo-Dyne liquid filled discharge pulsation dampener.

Every Flo-Dyne suction stabiliser works by exploiting three basic properties which each contribute to improve NPSHa: 

[suction stabiliser] Dampening Effect 
Every suction stabiliser has a gas charge which, as it is obviously more compressible than the liquid being pumped, will provide a capacitance or spring effect which in turn will absorb the pulsation created by the abrupt flow change as the pump suction valves open and close.

Separation Effect 
Flow through the suction stabiliser is slowed and rotated before leaving through the exit nozzle. By controlling the transit time and flow velocities through the equipment, entrained gases are encouraged to break out of solution and collect at the top of the stabiliser instead of passing directly into the pump inlet nozzle.
By reducing the quantity of entrained gas entering the pump, 
occurance of cavitation is further reduced.
 

[suction dampener] Volume Effect 
The suction stabilser acts as a mini-storage tank, the stabiliser provides a full charge of liquid when the pump valves open and allows for smooth acceleration and deceleration of the liquid in the line. By providing the tank volume close to the pump, acceleration head is eliminated and the possibility of cavitation occuring in the pump cylinders is eliminated. 


[dampener in manufacture] The suction stabiliser is constructed as a pressure vessel to meet your local and national regulation requirements. Supply to ASME VIII, ASME B31 or PD5500 is common, however, supply to other national codes such as Indian Boiler Code, AD Merkblatter, CODAP, Stoomwezen and UDT is always possible. 

Each unit may be supplied with connecting flanges, or with bevelled connections, and ready for connection directly into your pipework system.