---
Section 4- Procedures
*Prior to Starting
*Starting the Vacuum Pump
*Stopping the Vacuum Pump- Normal Operations
*Stopping the Vacuum Pump- Emergency Operation
Prior to Starting
Before starting the unit, review Sections II and III of
this manual and be certain that all installation
requirements have been met and that the purpose and
use of each of the controls, warnings and gauges are
thoroughly understood. The following check list shall
be adhered to before placing the vacuum pump into
operation.
!WA~~G!
Be sure the vacuum pump is grounded.
.
.
.-
●
●
●
●
●
✎
✎
✎
Remove all loose pieces and tools around the
vacuum pump installation.
Check fluid level in the airhluid reservoir. See
Lubrication Section.
Check fan and fan mounting tightness.
Manually rotate vacuum pump through enough
revolutions to be certain there are not mechanical
interferences.
Check all vacuum connections for tightness.
Check to make sure the pressure relief valve is in
place.
Check to make sure all panels and guards are in
place and securely mounted.
Check fhses, circuit breakers and thermal overloads
for proper size.
Open all manual shut-off valves (block valves)
beyond the air/fluid reservoir.
Check inlet filter element to see that it is securely
mounted.
After all the above conditions have been satisfied, close
the main power disconnect switch, jog the start and stop
buttons in rapid succession to check the rotational
direction of the vacuum pump. The vacuum pump and
fan must rotate clockwise when facing the vacuum
,-
pump from the shaft end on the QSVI 25,50,75,100
and 200. On the QSVI 40, the rotation is counter
clockwise from the shaft end facing the vacuum pump.
Starting the Vacuum PumD
Be sure that the exhaust line is open on the&y side of
air/fluid reservoir to ensure that no back pressure is
added to the pumping system.
Start the vacuum pump and watch for excessive
vibration or strange noises. If either is observed, stop
the pump immediately and correct. See stopping
instructions.
Control System - The control system vacuum settings
are factory set, however, they should be checked at the
startup as noted previously. Following is a discussion
of checking and adjusting the vacuum control system.
In order to make the discussion clear, certain terms
need to be understood. Range is that region of vacuum
levels desired in the system. The range has a maximum
value above which the system vacuum level should not
rise, and a minimum level below which the system
vacuum level should not fall. A typical range would be
from 23” HgV vacuum to 20” HgV vacuum. The
differential for this range is 3“ HgV which is the
difference between the maximum and minimum
settings of the range. Range and differential are
interchangeable. Upper set point and upper trip point
both refer to the maximum value of the range (23”
HgV). Lower set point and lower trip point both refer
to the minimum value of the range (20” HgV). The
vacuum regulator is usually set to operate at the lower
set point, and that is where it will be set if this
adjustment is followed.
The three items to be checked and adjusted, if
necessary, are:
1.) The vacuum switch differential
2.) The vacuum switch range
3.) The vacuum regulator set point
In order to make these adjustments an easy means of
varying air flow into the vacuum pump is required, so
that even when the vacuum pump is running at full
capacity the system vacuum level can be lowered below
the lower set point. If this is not possible, the plant
vacuum system must be disconnected from the vacuum
pump inlet and a hand valve screwed into the 3” pipe
tap in the vacuum pump inlet.
Page 40
To Next Page
Loading...