NBE O & M Document No. NES/NBE/O&M Page 8 of 43
discharge connection or the welding neck flange (if
available for partial draining) on the discharge side. It
is essential to ensure that the operating liquid level in
the machine's working space does not exceed the shaft
center during start-up.
WARNING!
Improper usage of the machine can lead to severe
or even fatal injuries!
It is essential to carefully read and adhere to the safety
precautions outlined in section 1. Failure to do so will
prohibit any work with or on the machine.
Risk of injury from rotating parts (impeller,
shaft):
There is a danger of limb amputation, entanglement of hair
and clothing. Exercise caution!
Risk from gauge pressure and vacuum:
There is a risk of sudden fluid escape causing skin and eye
injuries and entanglement of hair and clothing. Be
cautious!
Risk from escaping fluid:
There is a risk of burns, scalding, slipping, and falling. Take
precautions!
Commissioning and Operation should only be conducted
under the followingconditions: •All lines and fittings must
be properly mounted on the connections in the end shield.
Keep unused connections sealed with provided sealing
devices (plugs, covers). • Ensure the machine is fully
assembled. • Verify the motor rotation direction. • The
operating liquid level should be up to the middle of the
shaft, with the operating liquid supply connected and
checked. • The housing should not be overfilled. • Check
the fill level in the pump housing before starting. • Verify
the condition of armatures and regulating devices on the
suction and discharge sides. • Ensure suitable
environmental conditions. • Check and align the drive
elements (coupling, belt drives). • Align and ground the
machine. • Close unused connections with blind flanges. •
Keep inspection covers on the end shields closed.
WARNING!
Danger from gauge pressure and vacuum:The
machine poses a significant risk of bursting parts, sudden
fluid escape (resulting in skin and eye injuries), and
entanglement of hair and clothing when subjected to
excessively high pressures. Extreme caution is required!
The machine must not be operated with a blocked inlet or
discharge side!
Before initiating Operation, ensure the following
precautions: • Remove any closures from the inlet and
discharge connections. • Ensure all pipes are properly
connected. • Ensure that shut-off devices (e.g., valves, gate
valves, etc.) in the lines are open. • Prevent the connections
and lines from clogging with deposits or solid materials. •
When handling fluids containing solid materials, connect
suitable screens or filters upstream of the machine. • Be
aware that air saturated with water vapor, containing
droplets, emerging from the pressure side can cause icing
and create a slip hazard during winter. • Take into
consideration that air saturated with water vapor,
containing droplets, emerging through the roof can cause
icing, leading to additional roof loads and associated risks.
5.1.3 Shaft Seal:
For commissioning new machines with stuffing boxes
having internal liquid supply, the stuffing boxes are
usually adjusted during the factory test run. However,
during commissioning, tightening of stuffing box
packing by tightening each stuffing box gland by one
screw rotation may be required. For restarting
machines that were previously operated, the stuffing
boxes should be readjusted. For stuffing boxes with
external liquid supply, open the shut-off valve for the
sealing liquid to moisten the stuffing box packing.
These steps ensure a proper commissioning process
for the machine. Please refer to Table 1 for types of
mechanical shaft seals required for different NBE
pump models.
