Relationship among Pumps, Motors, Number of Membranes

[High Pressure Master]

A membrane unit can be fed by several pumps with different flow rates to achieve several outputs of freshwater.
The higher the productivity we want to achieve, the higher the pump flow rate will have to be, and thus also the electrical power required
Let's start by describing which pumps can be applied to our membrane racks and see how much freshwater can be produced and what electrical power needs to be committed
Please note that these calculations are theoretical with pressures of 60 bar, water temperature of 25 degrees Celsius, and salinity of 32000 PPM. Although they fairly closely reflect practical results, a +/- 10% difference in productivity is to be considered perfectly normal.
Single membrane 2540 or two membranes 2521

The smallest of our pumps which can be coupled to a single 2540 membrane is a 4 l/h pump.
We couple this pump to a special 12-volt motor which limits its flow rate to 3.5 l/h and by absorbing only 370 Watts (30 Amperes) allows it to produce 55 l/h of freshwater.
This is our Watermaker model "ZERO" , and you can see it here

The same pump applied to another special motor that increases the flow rate to 4.8 l/min, using the same 2540 membrane, allows a production of more than 60 l/h with a power consumption of 550 Watts (about 46 Amperes @ 12Volt).
The same result is achieved by coupling our 5.7 l/min stainless steel pump with a motor that limits its flow rate to 4.8 l/min.
This is our series of Watermakers "Just Water" and it can be seen here.

Using a single phase 230V-750 Watt motor coupled with the 4 l/min high pressure pump, we can achieve 60 l/h of freshwater.
Here you can see this watermaker

Using a 8 l/min high pressure pump coupled with a single or three phase(s) 230/400V-1,1 kW motor, we can achieve 75 l/h of freshwater.
Here you can see this watermaker.

Using a 11 l/min high pressure pump coupled with a single or three phase(s) 230/400V-1,5 kW motor, we can achieve 90 l/h of freshwater.
Here you can see this watermaker.

The same results described above, can also be achieved using 2 membranes 2521 instead of one single membrane 2540. This solution is a little more expensive but it has the advantage of taking up less space aboard.
Two membranes 2540

Using a 8 l/min high pressure pump coupled with a single or three phase(s) 230/400V-1,1 kW motor, we can achieve 120 l/h of freshwater.
Here you can see this watermaker.

Using a 11 l/min high pressure pump coupled with a single or three phase(s) 230/400V-1,5 kW motor, we can achieve 150 l/h of freshwater.
Here you can see this watermaker.
Three membranes 2540

Using a 13 l/min high pressure pump coupled with a single or three phase(s) 230/400V-2,2 kW motor, we can achieve 200 l/h of freshwater.
Here you can see this watermaker.
Four membranes 2540

Using a 13 l/min high pressure pump coupled with a single or three phase(s) 230/400V-2,2 kW motor, we can achieve 250 l/h of freshwater.
Here you can see this watermaker.
Three membranes 2521

Using a 4 l/min high pressure punp, coupled with a special motor that increases the flow rate to 4.8 l/min,  and using 3x 2521 membranes, it is allowed a production of more than 80 l/h with a power consumption of 550 Watts (about 46 Amperes @ 12Volt).
The same result is achieved by coupling our 5.7 l/min stainless steel pump with a motor that limits its flow rate to 4.8 l/min.
This is our series of Watermakers "Just Water" and it can be seen here.

Using a single phase 230V-750 Watt motor coupled with the 4 l/min high pressure pump, we can achieve 80 l/h of freshwater.
Here you can see this watermaker
Four membranes 2521

Using a 11 l/min high pressure pump coupled with a single or three phase(s) 230/400V-1,5 kW motor, we can achieve about 140 l/h of freshwater.
This Watermaker is made upon order of the client.