18
06
Operation
Manual 1843 Rev B p/n 001843 0000
PRE-START CHECKS
Before starting the pump, check the following
items:
1. The installation has been made in accordance
with
Installation on page 9
.
2.
The pump has been filled with oil and
the cylinder has been filled with water, in
accordance with
Installation on page 9
.
3. If the pump has been idle for a month or
more: turn the pump, by hand, two or more
revolutions to distribute oil internally through
the pump.
4. The temperature of the pump oil is 60°F (16°C)
or above. Optional pump heaters are available
for installation in the cylinder water jacket.
See
Cooling Water on page 14
.
5. Cooling water is available. Do not start the
cooling water flow until the pump has operated
a few minutes.
6. Drive belts are correctly tensioned.
See V-Belt
Drive on page 28
.
7. Direction of rotation is correct. It should be
clockwise when facing the pump pulley (in
accordance with arrow cast into the pump).
WARNING
!
Correct rotation is clockwise when viewed from
the drive end (counterclockwise when viewed
from the motor fan). Operating the pump with
the incorrect rotation will cause FAILURE.
WARNING
!
Physical harm may occur if human body parts
are in contact or exposed to the process
vacuum. Assure that all connections are
protected from human contact.
CAUTION
!
Do not touch hot surfaces.
Discharge gas based on operating
conditions can be elevated.
PUMP WARM-UP
With the inlet closed, pump warm-up and thermal
stabilization is achieved in 20-30 minutes.
Warm-up can be expedited by operation in the
20-40 Torr (27-53 mbar) range after an initial
5-minute operation with the inlet closed. This can
be accomplished with an inlet start purge or, if
allowable, a controlled air bleed near the inlet.
1. Check that the inlet isolation valve is closed.
2. Check that the vent valve is closed. Please
note that if the pump was not vented (
see
Proper Venting on page 13
) when the
pump was stopped, the following procedure
must be used:
a. Remove power source from the pump.
b. Remove belt guard from the pump.
c. Rotate pump, in proper rotation, by hand
using drive belts.
d. Rotate at least 3 full rotations.
e. Replace belt guard.
f. Reconnect the power source to the pump,
and ensure that motor rotation is in the
correct direction.
3. Start the pump.
4.
Open and adjust the cooling water flow as
shown in the specifications.
5. Maintain oil level 3/8 in. up from bottom
of the sight glass when running at blank-
off conditions (no gas ballast). Once the
circulating pump (gear pump) increases the oil
pressure to 20 PSIG (1.4 bar), the check valve
will open and oil will be forced into the pump
through the main line.