Suction Stabilizers : Stabilize Flow & Pressure / Save Energy
Suction Stabilizers stabilize the flow and pressure in the supply to the suction inlet of pumps.
Suction Stabilizer : full technology.
WHAT DOES A SUCTION STABILIZER DO ?
A suction stabilizer improves volumetric efficiency, prevents cavitation, reduces discharge surge and pulsation, increases pump life, and saves energy; Providing the best value in the pulse stabilizing investment business.
WHY ARE SUCTION STABILIZERS NEEDED ?
Suction systems experience instability caused by :
- Sudden pump start-up, which attempts to jerk the liquid into motion in such a short time that there is a dramatic pressure fall.
- Repeated low pressure spikes from reciprocating motion machine suction check valve openings which sends repeated low transients down the supply column breaking it into many individual slugs.
- Flow control by "Spill Back" into suction lines which froths the liquid making it springy and unpredictable.
SUCTION INSTABILITY ,
more precisely :
- 1a) Pump start jerk produces a pressure fall, which may pull gasses out of solution, or even going below phase change level into vapor causing a"flash" and breaking the supply column, exhibiting unstable flow and pump "knock".
- 2a) Check valve low pressure transients, produce high frequency reverberations in the suction line, making bubbles in the liquid which coagulate and allow the pump to lose prime.
- 3a) Spill back injects "frothing" into the suction pipe, destabilizing continuous "solid" mass transfer so that the output flow rate changes erratically.
SUCTION STABILIZERS AND " ACCELERATION HEAD "
- All of 1 , 2, & 3 are variations of the suction acceleration head stability, so that suction stabilizers may be referred to as "acceleration head dampeners", or acceleration head loss preventors.
Suction Stabilizers are selected to produce acceptable acceleration head figures for :
- each pump type, each of which has differing characteristics
- for the vapor pressure at temperature of each liquid, each of which is different
- its specific gravity, which enables the calculation of mass to be accelerated and
- length of suction supply column, the longer the more critical the problem
- All of i. thru iv. , at least, must be disclosed to a suction side pulsation damper supplier for the suitable selection of a suction stabilizer that will work properly.
- When a suitable suction stabilizer is chosen, stable flow and pressure is provided to the pump inlet, enabling it to stay properly filled, which then produces a more constant output, and so avoid undue discharge surge and or pulsation, that may fatigue the pipes, reduce the pump life, disrupt automation feedback and control.
A SUCTION STABILIZER IS :
- The best value lowest cost greatest improvement to a pumping system; AND is a low pressure container that :
- Intercepts suction pressure occurrences stopping them from passing back up the feed pipe.
- Provides a mass of liquid close to the pump inlet, to enable it to take in volume without having to instantaneously accelerate the whole of the weight of the inlet column.
- Prevents suction cavitation. V Has the capability of recovering more than 99% of acceleration head losses.
- Is a specialty consideration for highly experienced and perhaps "qualified" rotating equipment engineers.
- SEE API 674 and 675 for advice on proper suction system modeling. Search on the nomenclature "Pulsation Suppression Devices"