- 6 -
4.3 Coupling drive
Align coupling by using Dial Gauge. The concentricity should
be as follows:
Class of motor
On side of coupling
M180
less than 0.05
M200M and above
less than 0.08
Feeler gauge
Motor
Pump
Motor
Pump
side
side
side
side
Class of motor
At end of coupling
M132M and under
less than 0.1
M160M and above
less than 0.18
4.4 Preparation for operation
• Remove dust from Vacuum Pump and piping. Clean the
pipework thoroughly, ensuring welding slag and debris etc.
are removed.
• Check all suction and discharge connections are properly
tightened and all the piping is properly supported. Also
check cooling water piping.
• Supply oil up to the red mark of the oil gauge. If oil level is
low, gear and bearings can seize, and if oil level is too
high, the temperature will rise excessively, and can be the
cause of gear noise or some effect on other parts.
• Cooling water flow to be as specified in chart 1.3.
4.5 First Operation
Warning –> Start-up with pipework
At start-up, severe damage may occur if there is debris in
the pipework.
We therefore recommend a vacuum tight inlet filter of 5
micron rating is installed for start-up.
• With suction valve closed, run the motor briefly to check
direction of rotation, correct if required.
• Run the pump under no load condition for 20-30 minutes
to check for any abnormal vibration or heat. In case of any
abnormality, stop the pump and search for the cause. In
most cases, the cause is improper installation or coupling
centring. Check for correct lubricant level.
• Run the pump for 2 - 3 hours under normal load condition
and check the temperature and vibration of each parts.
• During operation, pay attention to indication of motor am-
pere Meter. If any abnormality is found, stop the pump
immediately and check the cause. Often, the cause is in-
terference between rotors or between the periphery of ro-
tor and the inner surface of casing. All pumps are factory
run before despatch, however, full care will be still neces-
sary after the pump installed on site.
* Caution during Operation:
• Check temperature of bearing & lubricant and indication
of Ampere meter & cooling water.
• Keep operation within designated specifications.
4.6 Stopping
• Shut suction valve.
• If any corrosive gas, solvent or water vapour has been
pumped, introduce atmospheric air ( or N
2
) from suction
side for 20-30 minutes before stopping to clean the pump
internals. If a solvent or steam cleaning purge is used, run
the pump for 10 minutes on air or N
2
purge only after steam/
solvent has been turned off.
• Stop the pump by turning off the motor.
• Shut off cooling water. If freezing is anticipated, discharge
water by opening of drain valves.
4.7 Lubrication
Lubricants to be used must be good and high grade petro-
leum products containing oxidation inhibitor, rust preven-
tive, extreme-pressure additive, etc. (Do not use any lubri-
cant which contains any element of water , sulphate resin
or tar.).
Turbine oil (ISO VG 68) readily obtainable in the market
will generally satisfy these requirements.
The following brands are recommended for use as lubri-
cants for gear and bearing.
• Lubricant: BP Energol THHT 68, BP Energol THB 68,
Regal R & O 68, Shell Turbo 68, Mobil Gear 626 or equiva-
lent oils.
• Grease: Aeroshell grease 150, Shell Dorium Grease R,
G 40 M, JFE 552 (NOK-Kluber) or equivalent grease.
4. Handling procedure
4.1 Assembly of piping
4.1.1 Location
• Mount the Pump on a clean, flat & level surface of suffi-
cient rigidity. If it is to be installed outdoors, check motor,
V-belt and other parts are for outdoor service.
• There should be enough space for maintenance, disas-
sembly, reassembly and periodical inspection, etc.
4.1.2 Foundation
• The pump can be mounted on a suitable concrete plinth
or steel framework.
4.1.3 Installation
• Mount the pump horizontally and centre it in accordance
with the instruction manual. The pump should be level to
within 0.5 mm per metre.
4.2 Piping Work
4.2.1 Main Piping
• Clean the inside of suction and discharge pipework to
ensure it is free from rust, dust and foreign matter, place a
strainer of 40 mesh on or over suction port.
• It is advisable to install an expansion joint on the suction
and discharge side of the pumps. Provide supports for pip-
ing so that no excessive load to be imposed on the pump.
• If silencer is to be fitted on the discharge side, install it as
near the discharge port as possible.
• Be sure to install a Non-return Valve adjacent to the suc-
tion port so that the pump will not turn in reverse when
switched off. If installation of the Non-return Valve is a prob-
lem for the duty of the pump, install a shut off valve, and
ensure it is closed prior to stopping the pump.
• In the event of condensate being collected at the pump
discharge, a collection tank may be installed under the
pump, and then the condensate and water will be collected
during operation and be discharged by the opening of a
drain valve.
• A drain receiver should be installed under the drain valve
to collect discharge.
4.2.2 Cooling water piping
Cooling water required to cool front end plate and casing.
The piping should be assembled with reference to the pip-
ing diagram and the outline drawing supplied.
* If Water Jacket type Silencer is installed, this Silencer also
requires cooling water.
