Calpeda NM Instrucciones Originales De Uso página 7

IST_NM libro05_2013:IST_GX 01_06 30/04/13 16.37 Pagina 7
4. Pipes
The inside diameter of the pipe-work depends
on the desired flow.
Provide a diameter assuring a liquid flow not
greater than 1.5 m/s for suction and 3 m/s for
delivery.
The pipe diameters must never be smaller than
the pump connections.
Ensure the inside of pipes are clean before con-
nection.
Secure all pipes to rests and connect them so
that they are not under stress, and do not tran-
smit vibration or flexing strain to the pump.
The suction pipe must be perfectly airtight
and be led upwards in order to avoid air
pockets.
Use an eccentric transition piece to join the
suction connection with a horizontal pipe of lar-
ger diameter (fig. 2).
c
d
Avoid formation of air pockets in suction
pipe:
a) eccentric transition piece;
b) gate valve with horizontal handwheel;
c) pipe leading upwards.
Avoid trasmission of stress to the pump:
d) supports and anchoring of pipes.
Fig. 2 Connection of pipes.
For suction lift operation fit a foot valve with
strainer which must always remain immersed.
For suction from a storage tank fit a check
valve.
For positive suction head operation fit a gate
valve.
Follow local specifications if increasing network
pressure.
Fit a gate valve into the delivery pipe to
adjust delivery, head, and absorbed power. In-
stall a pressure gauge.
With a geodetic head outlet over 15 m fit a
check valve between the pump and the gate
valve in order to protect the pump from water
hammering.
5. Electrical connection
Electrical connection must be
out only by a qualified
in accordance with local regulations.
Follow all safety standards.
b a
4.93.040
carried
electrician and
The unit must be properly earthed
(grounded).
Connect the earthing (grounding) conductor to
the terminal with the
Compare the frequency and mains voltage with
the name-plate data and connect the supply
conductors to the terminals in accordance with
the appropriate diagram inside the terminal box
cover.
With motor power rating ≥ 5,5 kW,
avoid direct starting.
Provide a control panel with star-delta
starting or an other starting device.
TTENTION: never allow washers or
other metal parts to fall into the in-
ternal cable opening between the
terminal box and stator.
If this occurs, dismantle the motor to recover
the object which has fallen inside.
Install a device for disconnection from
the mains (switch) with a contact separation
of at least 3 mm on all poles.
With three-phase motor provide an overload-
protection device in line with the nameplate
current (fig. 3).
6. Starting
TTENTION: never run the pump dry -
not even for a short trial run.
Start the pump after filling it completely with li-
quid.
When the pump is located above the
water level (suction lift operation) fill the suc-
tion pipe and the pump through the priming ho-
le.
Fig. 3 Filling.
When the liquid level on the suction si-
de is above the pump (inflow under positi-
ve suction head), fill the pump by opening the
suction gate valve slowly and com-
pletely, keeping the delivery gate valve open to
release the air.
Check that the shaft turns by hand.
marking.
4.93.141
7