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10.13 Checking of the Clearances
The clearance ensures that the rotors can rotate freely. The
clearance must be checked if the following parts are replaced:
– Shaft bearing and shaft
– Rotor
– Pump casing
Measurements
The clearance must be measured between the rotor and the
pump casing. The following dimensions must be measured:
– Axial clearance; the measurement depends on the position
of the rotors on the shafts.
– Radial clearance; the measurement depends on the position
of the pump casing on the gearbox.
Prerequisites
– Pump cover has been removed.
– Rotors have been fastened and fasteners tightened to the
specified tightening torque.
10.13.1 Required Clearances
► Check your order documents to determine if 10 bar, 20 bar,
14 bar, 30 bar, standard or high-temperature rotors are in-
stalled in the pump. If necessary, contact
Fristam .
10 bar Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 25 0.06 - 0.08 0.12 - 0.16
FKL 50 0.07 - 0.11 0.13 - 0.19
FKL 75 0.08 - 0.12 0.15 - 0.21
FKL 150 0.08 - 0.12 0.17 - 0.23
FKL 205 0.09 - 0.13 0.20 - 0.26
FKL 250 0.09 - 0.13 0.20 - 0.26
FKL 400 0.10 - 0.14 0.22 - 0.28
Table 17 Clearances for 10 bar rotors
14 bar Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 15 0.06 - 0,08 0.12 - 0.16
FKL 20 0.06 - 0.08 0.12 - 0.16
Table 18 Clearances for 14 bar rotors
20 bar Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 25 0.11 - 0.14 0.14 - 0.18
FKL 50 0.12 - 0.17 0.16 - 0.22
FKL 75 0.13 - 0.18 0.17 - 0.23
FKL 150 0.13 - 0.18 0.22 - 0.28
FKL 205 0.14 - 0.19 0.23 - 0.30
Table 19 Clearances for 20 bar rotors
FKL 250 0.14 - 0,19 0.23 - 0.30
FKL 400 0.15 - 0.20 0.25 - 0.31
30 bar Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 50 0.14 - 0.20 0.17 - 0.23
FKL 75 0.15 - 0.21 0.23 - 0.28
FKL 150 0.15 - 0.21 0.25 - 0.31
FKL 205 0.16 - 0.22 0.27 - 0.33
FKL 250 0.16 - 0.22 0.27 - 0.33
FKL 400 0.17 - 0.23 0.29 - 0.35
Table 20 Clearances for 30 bar rotors
High-Temperature Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 15 0.11 - 0.14 0.08 - 0.12
FKL 20 0.11 - 0.14 0.08 - 0.12
FKL 25 0.11 - 0.14 0.08 - 0.12
FKL 50 0.12 - 0.17 0.09 - 0.15
FKL 75 0.13 - 0.18 0.12 - 0.18
FKL 150 0.13 - 0.18 0.13 - 0.19
FKL 205 0.14 - 0.19 0.18 - 0.24
FKL 250 0.14 - 0.19 0.18 - 0.24
FKL 400 0.15 - 0.20 0.20 - 0.26
Table 21 Clearances for high-temperature rotors
Standard Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
FKL 15 0.06 - 0,08 0.05 - 0.09
FKL 20 0.06 - 0.08 0.05 - 0.09
FKL 25 0.06 - 0.08 0.05 - 0.09
FKL 50 0.07 - 0.11 0.05 - 0.11
FKL 75 0.08 - 0.12 0.07 - 0.13
FKL 150 0.08 - 0.12 0.08 - 0.14
FKL 205 0.09 - 0.13 0.11 - 0.17
FKL 250 0.09 - 0.13 0.11 - 0.17
FKL 400 0.10 - 0.14 0.12 - 0.18
FKL 580 0.11 - 0.16 0.14 - 0.19
FKL 600 0.11 - 0.16 0.14 - 0.19
Table 22 Clearances for standard rotors
20 bar Rotors
Pump size Axial Clearance [mm] Radial Clearance [mm]
Table 19 Clearances for 20 bar rotors