Vertical multi-stage close coupled pumps
MXV-B
OPERATING INSTRUCTIONS
Table of contents
Subject
Page
1.
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.
Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.
Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.1
Suction pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.2
Delivery pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.
Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.1. Preliminary checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.2. Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.3. Starting and checking operations . . . . . . . . . . . . . . . . . .6
7.
Maintenance and monitoring pump operation . . . . . . . .6
8.
Dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
8.1. Replacing the mechanical seal . . . . . . . . . . . . . . . . . . . .7
9.
Remounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
9.1. Tightening torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
10.
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
11.
Cross section drawing and designation of parts . . . . . . .7
READ AND FOLLOW ALL INSTRUCTIONS
1. Operating conditions
Standard construction
- For clean liquids: non-explosive and non-flammable, non-hazardous
for health or the environment, non-aggressive for pump
materials, not containing abrasives, solid or fibrous particles.
- With seal rings in EPDM the pump is not suitable for use with oil.
- Maximum final pressure in the pump casing: 16 bar.
- Liquid temperature: -15˚ to +90˚C.
- Installation in well-ventilated locations protected against the
weather, with maximum environment temperature of 40˚C.
2900 1/min
Rated motor power
up to
kW:
2,2
4
7,5
Sound pressure
dB (A) max:
68
69
74
Starts/hour max:
30
20
15
2. Transportation
Raise the pump-motor unit slowly (
fig.1
), making sure it does
not move from side to side in an uncontrolled way, to avoid
the risk of imbalance and tipping up.
3. Installation
The
MXV-B
pumps must be installed with the rotor axis in the
vertical position and with the base under the pump.
Install the pump as close as possible to the suction source (with
consideration given to the NPSH value).
Provide space around the pump for motor ventilation, to
allow for checking of shaft rotation, for filling and draining
the pump and to allow for collection of the liquid to be
removed
(especially for draining liquids which are harmful or
have to be removed at temperatures higher than 60 ˚C).
Make sure prolonged accidental leakage of liquid
does not cause damage to persons or property.
Leakage may develop as a result of surge pressure or
water hammer, erroneous operations (such as failing to close
a plug or valve) or other functional disorders. Allow for the
possibility of channeling away any leaked liquid or for an
automatic drainage system against flooding.
Mount the pump on a flat horizontal surface (using a level
gauge).
4. Pipes
Provide a diameter assuring a liquid flow velocity not higher
than 1.5 m/s for suction, and 3 m/s for delivery.
The pipe diameters must never be smaller than the pump
connection ports.
The arrows on the base of the pump (61.00) indicate the in-
let (suction) and outlet (delivery) ports.
Ensure the internal pipe surface is clean before connection.
ATTENTION
: secure all pipes to their rests close to the pump
and connect them so that they are not subjected to stress
and do not transmit vibration or flexion strain to the pump
(see
fig.2
).
Provide for the possibility of draining the pump without
having to drain the entire system.
Install correctly any compensators for absorption of expansion
or impeding noise transmission.
Screw the union couplings or the flanges into the
threaded
ports
(ISO 228) by inserting in the joint a suitable sealing ma-
terial.
Tighten the pipes or union couplings only to the extent sufficient
to ensure a tight seal. Excessive torque may damage the pump.
With
flanged ports
make sure the gaskets do not protrude insi-
de the pipes.
4.1. Suction pipe
When a pump is located above the water level
(suction lift
operation,
fig. 2 A
), fit a foot valve with a strainer, which must
always remain immersed.
The suction pipe must be perfectly airtight and be led upwards
in order to avoid air pockets.
When the liquid level on the suction side is above the pump
(inflow under positive suction head,
fig. 2 B
), fit a gate valve.
Follow local specifications if increasing network pressure.
Install a strainer on the suction side of the pump to prevent
foreign particles from entering the pump.
3.93.305
5
Fig.1 Raising pump.
3.93.125
5
1
5
1
7
5
4
7
2
5
3
6
B
A
Fig. 2 Systems diagram
A = Suction lift operation
B = Positive suction head operation
1. Strainer
2. Foot valve
3. Check valve
4. Bypass valve
5. Gate valve
6. Pressure gauge
7. Supports and clamps for
pipelines
