Tabla de contenido
Publicidad
Original instructions
Electrical connection.
Electrical connection must be carried out by a qualified electrician in
accordance with local regulation. Make sure that the supply voltage
corresponds to the voltage on the motor plate. It will be the local
responsible' s task to make sure earthing is carried out first and all
the installation operations are performed in compliance with the
applicable regulation.
Provide a device to disconnect each phase from the supply with a
break of 3mm between the contacts in the open position.
Regarding motor protection, install a switch or a thermal relay for the
current indicated on the motor plate, plus 5%.
3. OPERATION
a) Check that the pump rotates freely by hand.
b) Check that the direction of rotation shown on the motor is the
same as shown on the pump.
c) Auxiliary fittings: connect, where necessary, pipes for flowing
barring heating or cooling.
(Exec. A plan 32) Single mechanical seal with throat bushing.
If the stuffing box is not connected to the pump casing, flow the
mechanical seal with a consistent liquid at a pressure higher than that
inside the stuffing box.
Place a regulation valve at the inlet of the stuffing box.
(Exec. A plan 02) Single mechanical seal with throat bushing
and plug.
Before starting the pump unscrew the plug 903.5 to bleed the air
(Exec. B) Packing gland
Let the mechanical seal drop
(Exec. C) Double back-to-back mounting.
It is suitable for adhesive and hot liquids, with a tendency to form
crystals, gas etc. Through this mounting, contact is avoided between
the spring and the pumped liquid. Washing and cooling are obtained
through the circulation of an auxiliary liquid (compatible with the
sealed liquid); this liquid must be at a pressure of at least 0,5 Bar
higher than the existent one in the pump's casing.
(Exec. E plan 32) Simple mechanical seal.
Flushing the seal with compatible liquid with a pressure higher than
the pressure in the stuffing box
(Exec. F) Fluxed packing gland
Connect the flux line with en external net
(Exec. H) Heating cooling chamber.
Connect the chamber to the heating or cooling auxiliary circuit. Max
pressure allowed 5 bar
(L exec.) Double in series mounting.
Double in series mounting is needed when cooling liquid and washing
under pressure are not available. With this mounting the sealed liquid
can vary in pressure from the auxiliary one independently, whose
pressure must be between 0,1 and 0,3 bar.
If the pump is supposed to work with cold, warm or
dangerous liquid, cautions have to be kept to prevent any
possible accident
4. STARTING THE PUMP
1. Do not run the pump dry.
2. Start the pump only after filling completely with liquid through the
hole designed for this purpose (replace threaded plug after
each operation). When operating with positive suction head, fill the
pump by gradually and completely opening the inflow gate valve,
while keeping open the delivery gate valve to release air. Close
completely the delivery gate valve and check the suction head's
pressure to make sure the maximum final pressure is not higer than
the one tolerated by the pump.
3. Start the pump with the delivery gate valve closed. Then open
slowly the discharge gate valve, regulating the working point within
the limits indicated on the plate. Make sure the rotation's direction is
the one shown by the arrow on the pump casing. If rotation is in the
opposite direction, reverse the connections of two phases.
4. If the pump is supplied with a packing gland, check that the gland
exerts the right pressure against the seal rings. In case of
mechanicals seals, check that the cover is perfectly closed against
the casing. Open the washing liquid's feeding of the packing or of the
mechanical seal and regulate the flow.
5. If seal chamber's cooling is provided, open the feeding of the
cooling water, regulating its circulation.
6. When the pump is provided with steam preheating chambers, the
steam must flow in from the upper connections.
Stopping the pump.
Close the delivery gate valve if a check valve is not fitted.
Close the suction gate valve if a check valve is not fitted
Switch off the motor.
5. PERIODICAL CHECKS AND MAINTENANCE
Caution: disconnect the electrical power before any
servicing operation.
Make sure the pump works in conformity with the range of specified
performance levels and the absorbed current indicated on the plate is
not exceeded.
Pumps with mechanical seal.
Mechanical seals do not require maintenance. Except for possible
initial leak after the first stat-up, the mechanical seal on the shaft
must function without any loss of liquid. Do not run the pump dry.
When a leak occurs and increases gradually, the seal must be
replaced.
Packing gland.
Pumps with packing glands need a little dripping.
When dripping through the stuffing box becomes excessive and it
cannot tighten any further, change the seal rings. (see fig. 3 and tab.
1).
6. DISASSEMBLY AND REASSEMBLY
Before disassembling, close the suction and delivery gate valves.
See the sectional assembly drawing.
When
working
with
dangerous
warnings.
7. SEALS REPLACEMENT
Packing gland
Use seal rings suitable for liquid that should be pumped. Seal rings
have to be cut properly (fig. 3). It is necessary to alternate the gasket
slits, so that they don't fit each other.
d D
l
Fig.3 Packing gland
Shaft
Chamber
seal
dimension
Dia
d
D
l
24
40
45
33
49
51
Tab. 1: Packing gland's dimension
Mechanical seals.
Stationary part mounting: make sure that the bevel (or chamfer) and
the housing are absolutely clean and free from ragged edges and
traces of working. Damp the housing and the stationary gasket with
alcohol, glycerine or a compatible liquid. Press the stationary part into
the housing using a suitably covered stopper, mounted on the spindle
of a sensitive drill or small press.
Rotary part mounting: make sure that shaft is smooth, clean and free
from sharp edges. Polish the shaft if necessary with a fine abrasive
cloth (about 400 grains) even if it has been ground. After having
damped the shaft with alcohol, glycerine etc, mount the rotary part
turning the seal with a gentle motion opposite to thespring's winding.
Make sure that the two lapped faces come into contact. It is harmful
to put grease, oil, and other similar substances between the seal's
faces the which must be absolutely clean.
4
liquids,
follow
L
Packing
n°
n°
ring
packing
packing
ring with
ring
packing
without
ring
packing
ring
8
4
8
5
the
due
5
6
Publicidad
Tabla de contenido
