LPP-T Pumping Corrosive Suplphuric Acid
Due to its highly corrosive properties, there are only a few pumps that can reliably handle sulphuric acids and fewer that can provide flexible flow control when the supply tank is on a higher level than the discharge head. The Larox Flowsys LPP-T can do both.
|
Process Conditions
|
|
Specific Gravity
|
1.3
|
|
Sulphuric Acid Concentration
|
20 to 30 %
|
|
Temperature
|
Ambient
|
|
Medium
|
Corrosive Sulphuric Acid
|
Larox Flowsys in the Process
Since its installation in early 2004 at Kemira Growhow Plant in Finland, the Larox peristaltic pump has been pumping sulphuric acid to a thickener in which the sulphuric acid reacts as a flocculent. Equipped with a detector for early hose leak warning, the LPP-T is working as the main pump; a standby pump is reserved for maintenance. Hose changes are carried out according to a preventive maintenance schedule.
The sulphuric acid concentration ranges from 20 to 30% at ambient temperatures with slurry specified gravity (S.G.) of 1.3. The flow rate varies from 0.2 to 0.5 m3/h and the maximum speed is 35 rpm. The flow-rate is controlled by an inverter; the average flow being 9 l/min.
A PID control loop with fixed set point and process feedback from Krohne Coriolis mass flow meter controls the pump. The PID controller gives a control signal of 4 - 20 mA to the inverter, which regulates the speed and flow of the pump. Made of the most durable and resistant materials, the robust Larox Flowsys LPP-T provides a safe and reliable liquid transfer even when handling the most aggressive media.
|
|
