Installer Manual Fleck 2910 - NXT - System sizing
24 / 114 Ref. MKT-IM-002 / B - 23.05.2018
The softening and regeneration reactions are driven under certain conditions. To allow these
reactions to take place, make sure that the velocity is convenient during the different phases for
proper ion exchange. This velocity is given in the resin manufacturer specifications sheet.
Depending on the inlet water hardness, the service velocity for standard softening must be between:
Note
Failure to respect the service velocity will lead to hardness leakage or even total softener
inefficiency.
Note that the water supply piping size may also be useful when estimating the nominal flow rate, since
the size of the piping allows a maximum flow rate to pass. Assuming the maximum velocity of water
in pipes is about 3 m/s, a good estimation for most common pressure [3 bar] and temperature [16°C]
is:
Service velocity
[bed volume per hour]
Inlet water hardness
[mg/l as CaCO
3
]
°f
°TH
°dH
8 - 40 <350 <35 <19.6
8 - 30 350 to 450 35 - 45 19.6 - 25.2
8 - 20 >450 >45 >25.2
Piping size (internal diameter) Max. flow rate
[in] [mm]
[m
3
/h at 3 m/s]
0.5 12 1.22
0.75 20 3.39
1 25 5.73
1.25 32 8.69
1.5 40 13.57
2.0 50 21.20
2.5 63 34.2
3.0 75 49.2
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