I-120
GH Pump 120 – 16.02.EN
12
G. PRE-INSTALLATION PROCEDURES.
DANGER
Before activating the pumping unit, check to
make sure there are no personnel working on
the unit. Serious injury or death to personnel
could result if the unit is activated while being
worked on.
1. Observe all caution or danger tags attached to
the equipment.
CAUTION
Never run the pump dry. Close running fits
within the pump are liquid lubricated. Dry
running will result in pump seizure or damage.
2. Before starting the pump, rotate shaft by hand
to assure all moving parts are free from rubbing.
3. Before starting the pump, install guards to
enclose all exposed rotating parts.
4. Before starting the pump, fill the volute and
suction line with liquid. The pump is being
primed in accordance with Section VIII,
Paragraph B.
5. Before starting a mechanical seal pump
equipped with external flush lines, turn on seal
water, and confirm the seal water is at sufficient
pressure.
6. Make sure all fasteners are torqued to the
proper torque values to avoid equipment
damage and injury to personnel.
H. PIPING. All piping should be independently
supported near the pump so that pipe strain will not be
transmitted to the pumping unit.
CAUTION
All piping connections must be made with the
pipe in a freely supported state. Do not apply
vertical or side pressure to align the piping with
the pump flange.
Before connecting suction, discharge, and auxiliary
piping, check to see that the piping is absolutely clean
internally. Any debris in the piping will be drawn into the
pump passageways and can cause extreme damage.
The internal diameters of the suction and discharge
lines must be equal to the internal diameters of the
pump suction and discharge nozzles.
Suction lift lines shall be laid with a rising slope toward
the pump and suction head lines with a downward slope
towards the pump.
The suction pipe must be air tight and sloped upward to
pump flange to avoid air pockets which will impair pump
operation. The discharge pipe should be as direct as
possible using a minimum number of valves to reduce
pipe friction losses.
Never use a straight taper (concentric) reducer in a
horizontal suction line because air pockets may form in
the top of the reducer and the pipe. Use an offset
(eccentric) reducer instead.
It is recommended to install a check valve and closing
valve in discharge line and closing valve in suction line,
depending on the type of plant and pump. The check
valve, between the pump and valve, protects pump from
water hammer and prevents reverse rotation in the
event of power failure. Closing valves are used in
priming, starting, and pump shut down. Pump must
never be throttled by use of a valve in the suction line.
Thermal expansions of the pipeline must be
compensated by appropriate measures so as not to
impose any extra loads on the pump exceeding the
permissible pipeline forces and moments. Refer to Table
1 for permissible forces and moments.
I. AUXILIARY PIPING CONNECTIONS AND
GAUGES. In addition to primary piping connections, the
pump may require other connections such as gauges or
drains. All these lines and gauges should now be
installed. Refer to vendor mechanical seal drawing for
seal line connections to the mechanical seal.
J. MOTOR. Refer to motor vendor’s manual for motor
information and information on connecting to the power
supply.
DANGER
Connection to the power supply must be
effected by a trained electrician only. Check
available main voltage against the data on the
motor rating plate and select appropriate start-
up method.
K. DIRECTION OF ROTATION. Correct pump rotation
is indicated by an arrow on the bearing frame or
backcover depending on the style of pump that you
have. The standard direction of rotation, viewed from the
motor end, is clockwise.
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