Bell & Gossett P5002169C Series VSCS - Manual (Page 13)

11
Final Alignment
Final alignment cannot be accomplished until
the pump as been operated initially for a
sufficient length of time to attain operating
temperature. When normal operating
temperature has been attained, secure the
pump to re-check alignment and compensate
for temperature accordingly. (See the section
entitled Coupling Alignment.)
NOTE: Elastomeric couplings are specifically
designed to accommodate angular shaft
misalignment, as well as parallel offset of the
pump and motor shafts. However, the amount
of the offset and/or misalignment is
dependent on the style of flexible coupling
applied. Left unchecked, coupling
misalignment has a significant impact on the
overall life of the mechanical seals and the
bearings of the pump.
WARNING: Rotating Components
Hazard
Do not operate pump without all guards in place.
Failure to follow these instructions could result in
serious personal injury or death, or property
damage.
SUCTION AND DISCHARGE PIPING
When installing piping, refer to the Hydraulics
Institute Standards and observe the following
precautions:
Piping should always be run to the pump.
Do not move pump to the pipe. This could make
final alignment impossible.
Both the suction and discharge piping should be
supported independently near the pump and
properly aligned so that no strain is transmitted to
the pump when the flange bolts are tightened. Use
pipe hangers or other supports at necessary
intervals to provide support. When expansion
joints are used in the piping system they must be
installed beyond the piping supports closest to the
pump. Tie bolts should be used with expansion
joints to prevent pipe strain. Do not install
expansion joints next to the pump or in any way
that would cause a strain on the pump resulting
from system pressure changes.
Install the piping as straight as possible, avoiding
unnecessary bends. Where necessary, use 45° or
long sweep 90° fittings to decrease friction losses.
Make sure that all piping joints are leak tight.
Where flanged joints are used, ensure that inside
diameters match properly.
Remove burrs and sharp edges when making up
joints.
Do not “spring” piping when making any
connections. Coupling and bearing wear will result
if the suction or discharge lines are forced into
position.
When considerable temperature changes are
anticipated, equipment for absorbing expansion
should be installed in the system in such a way as
to avoid strain on the pump.
When using an isolation pad, flexible piping should
also be used on both the suction and discharge
sides of the pump.
The pipeline should have isolation valves around
the pump and have a drain valve in the suction
pipe.
See Technical Bulletin B-876 or BX-876, Table 5
for allowable static flange loading for vertical
flange configuration. (Models VSC and VSCS)
A Bell & Gossett Triple Duty Valve installed in the
discharge line will serve as a check valve to
protect the pump from water hammer, as a gate
valve for servicing, and for throttling.