Fristam Pumps FPM 3531, Английский перевод оригинального немецкого руководства по эксплуатации, Страница: 17 / 25

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Fig. 21 Measuring the clearance stationary bushing / pump casing
2. Distance B, use vernier calipers to measure the hub of the
impeller.
Fig. 22 Measuring the impeller
3. Calculate the clearance (clearance = A – B).
4. Compare clearance with Table 6 "Standard clearance" .
9.7.2 Measure the clearance impeller pump cover / pump
type FSM
Procedure
1. Measure the clearance Z between the pump casing (41) and
the impeller (40) using vernier calipers.
Note: In order to measure distance Z, the impeller must be
pulled to the front in the direction of the pump casing.
Fig. 23 Measurement of pump casing–impeller clearance
2. Compare clearance Z with Table 7 "Clearance", Page 16 .
9.7.3 Measure the clearance impeller pump cover / pump
type FSM
Prerequisites
– Pipe on discharge line fitting has been detached.
– Pump casing is connected firmly to the lantern.
– Impeller has been mounted without plastic snap ring (30) .
– Impeller nut has been tightened.
Procedure
1. Pick up the leaf feeler gauge.
2. Measure the clearance inside the pipe connection (discharge
line). See Fig. 24 "Measurement of impeller–pump cover clear-
ance" .
Pump size Clearance [mm]
Impeller / pump casing
711/712 0.5
721/722 1.0
741/742 1.5
3531/3532 1.7
3541/3542 1.0
Table 6 Standard clearance
A
38
37
B
40
41