Dosing / Metering Pump
These pumps are used for exact metering of fluid
Screw Series Pump
Screw series pump are progressive cavity type pump.
Dosing System on Skid
A typical dosing system incorporates the following parts solution preparation tank single or compartmented dosing pumps single or multiple stirrer valves fitting interconnecting piping instruments like pressure gauges,level gauge control panel
Pumps are commonly rated by horsepower, flow rate, outlet pressure in metres (or feet) of head, inlet suction in suction feet (or metres) of head. The head can be simplified as the number of feet or metres the pump can raise or lower a column of water at atmospheric pressure.
From an initial design point of view, engineers often use a quantity termed the specific speed to identify the most suitable pump type for a particular combination of flow rate and head.
The pump material can be Stainless steel (SS 316 or SS 304), cast iron etc. It depends on the application of the pump. In the water industry and for pharma applications SS 316 is normally used, as stainless steel gives better results at high temperatures
The submersible pumps used in ESP installations are multistage centrifugal pumps operating in a vertical position.
The pump itself is a multi-stage unit with the number of stages being determined by the operating requirements. Each stage consists of a driven impeller and a diffuser which directs flow to the next stage of the pump. Pumps come in diameters from 90mm (3.5 inches) to 254mm (10 inches) and vary between 1 metre (3 ft) and 8.7 metres (29 ft) in length. The motor used to drive the pump is typically a three phase, squirrel cage induction motor, with a nameplate power rating in the range 7.5 kW to 560 kW (at 60 Hz).
Pumps can be broadly categorized according to three techniques: