PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05
®
In particular, fault diagnosis is essential to enhance
pump and plant reliability.
6.8.1 Casing, seal plate, diffuser and impeller
a) Inspect for excessive wear, pitting, corrosion,
erosion or damage and any sealing surface
irregularities.
b) Replace as necessary.
6.8.2 Motor shaft and stub sleeve (if fitted)
Although the pump is in most executions of the “dry
shaft design” Replace if grooved, pitted or worn.
6.8.3 Gaskets and O-rings
After dismantling, discard and replace.
6.8.4 Motor bearings
a) It is recommended that bearings are not re-used
after any removal from the shaft.
6.9 Assembly
To assemble the pump consult the sectional drawings,
see section 8,
Parts list and drawings
.
Ensure threads, gasket and O-ring mating faces are
clean. Clean all parts carefully before assembly and
replace any which are worn or damaged. Apply thread
sealant to non-face sealing pipe thread fittings.
6.9.1 Fitting the neck bus
This procedure describes the fitting of the neck
(throttle) bush into the casing cover.
��
Clean the mounting surfaces of the neck bush
[4132] and the casing cover.
��
Fit the neck bush in the casing cover on the top
side.
The neck bush should be fixed in relation to the casing
cover using 3 set screws [6570.3].
��
Drill 3 holes at 120
°
intervals in the partition
between neck bush and casing cover. Drill the
holes to a depth such that the set screws [6570.3]
do not protrude above the surface of the neck
bush and the casing cover.
��
Tap screw thread into the 3 holes and remove the
metal chips.
��
Mount the set screws.
��
Fix the set screws using a centre point.
6.9.2 Fitting the impeller wearing rings
The procedure specified below is to be followed
with regard to the impeller wearing rings [2300.1 & 2]
on one or both sides of the impeller.
��
Clean the mounting surfaces of the impeller
wearing ring and the impeller.
��
Use the appropriate personal
protection equipment when heating and positio-
ning the impeller wearing ring.
��
Heat the impeller wearing ring to a temperature
of 120 to 150
°
C. Take care if the impeller
wearing ring has a sprayed-on layer of chrome
as this may break away if heating or cooling is
carried out quickly.
��
Push the impeller wearing ring right over the
impeller and let the whole assembly cool down.
��
Tap screw thread into the 3 holes and remove
the metal chips.
��
Mount the set screws [6570.2].
��
Fix the set screws using a centre point.
6.9.3 Fitting the case wearing rings
The procedure specified below is to be followed
with regard to the installation of the case wearing
ring [1500.1] in the diffuser. The same procedure
can be followed when installing the case wearing
ring in the casing cover. Read casing cover instead
of diffuser.
��
Clean the mounting surfaces of the case
wearing ring [1500.1 & 2], the diffuser gland
and the pump casing.
��
Use the correct personal
protection equipment when cooling and
positioning the case wearing ring.
��
Cool the case wearing ring using liquid
nitrogen.
��
Lower the case wearing ring vertically in the
diffuser and wait until the case wearing ring is
tight.
��
Drill 3 holes at 120
°
intervals in the partition
between the case wearing ring and diffuser.
Drill the holes to a depth such that the set
screws [6570.2] do not protrude above the
surface of the case wearing ring and the
diffuser plate.
��
Tap screw thread into the 3 holes and remove
the metal chips.
��
Mount the set screws [6570.2].
��
Fix the set screws using a centre point.
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