Argal ZMR 02.30, Use Manual

Page: 10 / 20

10
Fit in the intermediate casing ( pos.6 ) the diaphragm ( pos.50 ) and the fixed
seal ( pos. 21 ) with relevant O rings ( pos. 20
– pos. 49 ) and pack all the
parts by locking the lock nut fixed seal
Insert the rear side of the impeller in the intermediate casing and then fit on it (
fig. 8.5 )
-
the seal ( rotating seal pos. 24 or pos. 26 )
assemble the complete intermediate casing ( inclusive of barrier pos. 48 if
present
– fig. 8.6 ) on the shaft (pos. 11 ) previously locked on the electric
motor shaft.
-
WARNING ! Rotate the impeller until the correct assembly position is found
and lock the group with the ogive ( pos. 7
– locking torque 24 Nm ) ( fig. 8.7 )
-
Should the seal installed be SF1 , set the pump vertical and lock the nut fixed
seal through the opening of the intermediate casing placed in the lower side
of the pump deprived of the barrier.
Should the seal installed be type MSFA , remove one of the two fluxing connection ( pos. 56 ) to reach and screw
with the key wrench the two hexagonal socket on the mechanical lock nut fixed seal ( fig. 8.8 )
-
Complete the assembly positioning the O ring ( pos. 8 ) and the volute casing ( pos. 3 )
9 SAFETY RISKS
WARNING! CHEMICAL HAZARD .
The pumps are designed to pump different types of liquid and chemical. Follow the specific instructions to
decontaminate during inspection or maintenance
WARNING!
Safety risks for personnel mainly arise from improper use or accidental damages.
These risks may be of an electrical nature as far as the non-synchronous motor is concerned and may cause
injury to hands if working on an open pump. Risks may also arise due to the nature of the liquids pumped. It is
therefore of utmost importance to closely follow all the instructions contained in this manual so as to eliminate
the causes that may lead to pump failure and the consequent leakage of liquid dangerous for both personnel
and the environment.
In any case five general rules are important:
A - all services must be carried out by specialised personnel or supervised by qualified personnel depending on the type of
maintenance required
B - install protection guards against eventual liquid sprays (when the pump is not installed in remote areas) due to an accidental
pipe rupture. Arrange for safety basins to collect possible leakage
C - when working on the pump always wear acid-proof protective clothing
D - arrange for proper conditions for suction and discharge valve closing during disassembly
E - make sure that the motor is completely disconnected during disassembly.
Proper design and building of the plants, with well positioned and well marked piping fitted with shut-off valves, adequate
passages and work areas for maintenance and inspections are extremely important (since the pressure developed by the
pump could give some kind of damage to the plant in case this one should be faulty made or wear and tear-damaged).
It must be stressed that the major cause of pump failures leading to a consequent need to intervene is due to the pump running
dry in manually operated plants. This is generally due to:
Fig.8.5
Fig.8.7
Fig.8.8
Fig.8.6
Fig.8.5