9.3 Well system pressure overload
In order to provide protection against overpressure, install a pressure relief valve downstream of the well head.
The setpoint of the pressure relief valve must be at least 30 psi above the pressure setting.
If you install a relief valve, we recommend that you connect it to an appropriate drainage point.
Using Pmin and Qmax, the minimum diaphragm tank size, precharge pressure and pressure switch settings
can be found in the guideline table below:
Example
Pmin = 35 m head, Qmax = 2.5 m
3
/h.
On the basis of this information, the following values can be found in the table:
Minimum diaphragm tank size = 33 litres.
Ppre = 31.5 m head
Pcut-in = 36 m head
Pcut-out = 50 m head
Pmin
[m]
Qmax [m
3
/h]
Ppre
[m]
Pcut-in
[m]
Pcut-out
[m]
0.6 0.8 1 1.2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8
Diaphragm tank size [litres]
25 8 8 18 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 22.5 26 40
30 8 8 18 18 18 24 33 33 50 50 50 50 80 80 80 80 80 27 31 45
35 8 18 18 18 18 24 33 33 50 50 50 80 80 80 80 80 31.5 36 50
40 8 18 18 18 18 24 33 50 50 50 80 80 80 80 80 36 41 55
45 8 18 18 18 24 33 33 50 50 50 80 80 80 80 40.5 46 60
50 8 18 18 18 24 33 50 50 50 80 80 80 80 45 51 65
55 18 18 18 18 24 33 50 50 50 80 80 80 49.5 56 70
60 18 18 18 18 24 33 50 50 80 80 80 80 54 61 75
65 18 18 18 24 24 33 50 50 80 80 80 80 58.5 66 80
1 m head = 0.098 bar.
18
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