Armstrong 4280 Series Handleiding voor installatie en gebruik - Pagina 6
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6
• Suction and discharge pipes may be increased or
decreased at the pump nozzle to suit pump capacity
and particular conditions of installation. Use eccentric
reducers on suction connection with flat side uppermost.
• Layout the suction line with a continual rise towards the
pump without high points, thus eliminating possibility of
air pockets that may prevent the pump from operating
effectively.
• A strainer of three or four times the area of the suction
pipe, installed in the suction line, will prevent the entrance
of foreign materials into the pump. 5mm diameter
perforations in the strainer is typical.
• In open systems, test suction line for air leaks before
starting; this becomes essential with long suction line or
static lift.
• Install, at the pump suction, a straight pipe of a length
equivalent to 4 or 6 times its diameter; this becomes
essential when handling liquids above 49°c ( 120°f ).
Armstrong suction guides may be used in place of the
straight pipe run and in-line strainer.
• Install an isolation valve in both suction and discharge
lines on flooded suction application; these valves are used
primarily to isolate the pump for inspection or repair
• Install a non-slam non-return check valve in discharge line
between pump and isolation valve to protect pump from
excessive back pressure and to prevent water running
back through the pump in case of driver failure on open
systems. An Armstrong Flo-Trex valve may be used in
place of non-return check valve and isolation valve on
pump discharge.
caution:
The discharge valve only is to be used to throttle pump
flow, not the suction valve. Care must be taken in the
suction line layout and installation, as it is usually
the major source of concern in centrifugal pump
applications
oper ation
4 .
starting pump
• Ensure that the pump turns freely by hand, or with some
mechanical help such as a strap and lever on larger
pumps. Ensure that all protective guarding is securely
fixed in position.
• The pump must be fully primed on start up. Fill the pump
casing with liquid and rotate the shaft by hand to remove
any air trapped in the impeller.
Series 4280
motor mounted pump
• Bump or energize the motor momentarily and check that
the rotation corresponds with the directional arrow on the
pump casing.
• To reverse rotation of a three-phase motor, interchange
any two power leads.
• Start the pump with the discharge valve closed and the
suction valve open, then gradually open the discharge
valve when the motor is at operating speed. The
discharge valve may be "cracked" or open slightly at start
up to help eliminate trapped air.
• When stopping the pump: Close the discharge valve and
de-energize the motor.
• Do not run the pump against a closed discharge valve for
an extended period of time. (A few minutes maximum)
• Star-Delta motor starters should be fitted with electronic/
mechanical interlocks that have a timed period of no more
than 40 milli-seconds when switching from star (Starting)
to delta (Run) connection yet allow the motor to reach full
star (Starting) speed before switching to delta (Run).
• Should the pump be noisy or vibrate on start-up a com-
mon reason is overstated system head. Check this by
calculating the pump operating head by deducting the
suction pressure gauge value from the discharge gauge
reading. Convert the result into the units of the pump
head as stated on the pump nameplate and compare the
values. Should the actual pump operating head be signifi-
cantly less than the nameplate head value it is typically
permissible to throttle the discharge isolation valve until
the actual operating head is equal to the nameplate value.
Any noise or vibration usually disappears. The system de-
signer or operator should be made aware of this soon as
some adjustment may be required to the pump impeller
diameter or drive settings, if applicable, to make the pump
suitable for the system as installed.
caution:
Check the direction of rotation against the rotation
arrow prior to operating the unit.
5 .
gener al care
The Series 4 28 0 pumps are built to operate without periodic
maintenance. A systematic inspection made at regular inter-
vals will ensure years of trouble-free operation, give special
attention to the following:
• Keep the unit clean
• Provide the motor with correctly sized overload protection
• Keep moisture, refuse, dust or other loose particles away
from the pump and ventilating openings of the motor.
• Avoid operating the unit in overheated surroundings
(Above 40°c / 10 0°f).