What are the dosage pump in chiller system?

it regularly added chemical treatment to the chiller system to protect the system..

Some chemicals are added in the chilled water to protect the cooling coils of chiller and AHUs FCUs and stop making fouling in the system. But it has to be calculated as per the system volume and time duration.

it is used for chemical dosing of system to protect from algae ,dirt and uneven unsterelised develpoed  in  the system

It does not have a dosage pump in the chiller machine, but as far as I can supply him to the unity of the cooling tower. I have attached something of information on dosage pump with appreciation.

Chemical dosing pumps

Two basic types of dosing pumps are available:-

Diaphragm pumps using either an electromagnetic solenoid operator or motor. Diaphragm pumps are capable of injecting into high pressures up to20 bar depending on the motor driver used. If allowed to pump dry they will lose their prime and will require manual repriming.

Peristaltic pumps use a system of rollers compressing a tube to create a flow. These have the advantage that they do not require non return valves to operate and will readily self prime even if run dry. The output pressure of peristaltic pumps is however limited by their design to1.5 bar on most models and5 bar on high pressure units.

Cooling Tower Dosing

Bleed-off control

Controls the accumulation or build up of dissolved solids in the recirculating water caused by the evaporation. The bleed-off control operates a bleed-off valve to drain water from the system, allowing additional make-up to dilute the system water and reduce the dissolved solids level.

Normally in chiller system we are using two type chemicals (Corrosion inhibitor & sterilizer) and simply the quantity should match with the chiller capacity and also the pump dosing rate should be calculated.

finally as everyone knows that the purpose of such type of dosage is to protect the system.