MEGACHEM
901.01
901.05
4
183
3.2 Start-up
Start the set against a close discharge valve only. Once the
pump has reached full speed, slowly open the discharge valve
to the duty point.
After the pump has reached its working temperature and/or if
leakage occurs, tighten bolts (901.01) with the set
disconnected / switched off.
3.3 Shutdown
Close the discharge valve.
The discharge valve can remain open if the
discharge line is fitted with a non-return device on condition
there is back pressure.
Switch off the motor, making sure the pump set runs down
smoothly and evenly to a stand still.
If the pumpset is to remain out of service for long periods,
(means more than 6 months) close the isolating valve in the
suction line and close all connections.
If there is danger of freezing and / or if the pump is to be out of
service for long period, then the pump must be drained or
otherwise protect it against freezing.
4 Maintenance and lubrication
4.1 Supervision of operation
The pump must run quietly and evenly at all times.
The pump must never run dry.
The bearing temperature may be allowed 50
0
C above ambient
temperature, but must not exceed 80 0C (measured at the
bearing housing body).
Do not run the pump for a long period (more than 5 min.)
against a closed discharge valve.
Pumps with mechanical seals experience minor or invisible
(vapour) leakage. The seal is maintenance free.
Standby pumps should be started up and immediately shut
down again once a week to keep them operational.
Flexible parts of coupling which shows signs of wear should
be replaced in good time.
4.2 Lubrication and lubricant change
4.2.1 Grease change
The anti-friction bearings are pre-packed for life with grease
by the bearing manufacturer; no necessity of re-greasing it
during its whole life.
4.2.2 Oil change (if applicable)
The first oil change must be carried out after 300 hours of
operation; all subsequent oil changes after 3000 hours. The
bearing bracket should be filled with oil of any one of the following
types and specifications & for quantity; refer table no. 3.
5 Dismantling
5.1 General
Before dismantling, make sure the motor is disconnected from
the power supply and can not be switched on
accidentally. The suction and discharge shut off valves must
be closed.
The pump casing must have cooled down to ambient
temperature. The pump casing must be empty and not under
pressure.
5.2 Dismantling
Procedure:
1. For oil-lubricated pumps drain-off the oil as described in
4.2.2.
2. Disconnect from power supply.
3. Detach all auxiliary supply pipe lines.
4. Remove coupling guard
5. Remove coupling spacer (if applicable)
6. Remove coupling half from the pump shaft. Ref. fig no.10
Fig. no. 10 : Dismantling the pumpset
For coupling without spacer / intermediate sleeve :
1. Remove discharge and suction branch from pipe line.
2. Loosen pump from base plate.
3. Uncouple pump and motor.
4. Disconnect motor from power supply.
5. Remove motor from base plate.
6. Remove supporting foot (183) from the baseplate and
loosen bolts (901.01) on discharge cover. Refer Fig. no.10.
7. Pull out bearing bracket with discharge cover and complete
rotor (assembled unit.)
(With larger pumps, suspend or support bearing bracket to
prevent the rotating assembly from falling over.)
For coupling with spacer / intermediate sleeve, during
dismantling the volute casing can remain on the base plate
and in the pipeline.
1. Remove spacer/intermediate sleeve of the coupling.
2. Remove supporting foot (183) from the base frame and
loosen bolts (901.01) on discharge cover. Refer fig No.11.)
3. Pull out bearing bracket with discharge cover and complete
rotor (assembled unit).
If the pump has been in operation for a long time, some parts
may be difficult to remove. In this case use a brand name
penetrating oil e.g. WD-40 / Rustoline or suitable pull-off device.
Procedure : Unscrew oil drain plug beneath the constant
level oiler and drain off the old oil. When the bearing bracket
is empty replace the oil drain plug and fill in fresh oil in
accordance with sec.3.1.1.
Indian oil Servosystem 46
Hindustan Petroleum Enclo 46
Bharat petroleum Bharat Hydrol 68
Table no. 3
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