Horizontal end-suction
centrifugal pumps PN 10
with bearing bracket
In accordance with european standard EN 733
N, N4
OPERATING INSTRUCTIONS
1. Operating conditions
Standard construction
- For clean liquids, without abrasives, non-explosi-
ve and non-aggressive for pump materials.
- Maximum liquid temperature: 90 °C.
- Maximum permissible pressure in pump casing:
10 bar.
- Maximum ambient temperature: 40°C.
- Rated speed of rotation (50 Hz):
N
= 2900 r.p.m.;
N4
= 1450 r.p.m.
- Maximum permissible rotation speed: see table
on page 12.
Rated motor power
N
(2900 r.p.m.) up to kW:
2,2 7,5 30 75
N4
(1450 r.p.m.) up to kW:
7,5 30 75
Sound pressure dB (A) max:
70 80 85 90
Starts per hour max:
60 40 20 10
2. Installation
N, N4 pumps
(with nominal duty points and main
dimensions in accordance with EN 733 are inten-
ded for use with standard electric motors in IM B3
construction form (IEC 34-7, IEC 72), connected
by means of a baseplate and driven by a flexible
coupling. The pump-motor units are intended for
use in the horizontal position.
Lift and transport the pump-motor unit as indica-
ted in
fig. 1
.
Place the pump as close as possible to the suc-
tion source (with consideration of NPSH).
Normally, the pump-motor unit must be protected
from the weather and exposition to the sun’s rays.
Make sure motor ventilation is not impeded and
provide access around the unit for inspection and
maintenance during operation.
2.1. Foundation
The smaller units are mounted on a
single-piece,
channel-steel baseplate
with a high degree of
torsional strength.
Whith this type of construction a foundation is not
indispensable, in the case of units of limited wei-
ght and when light loads are expected through
pipelines.
However, a raised foundation will facilitate drai-
ning of pump casing and will provide extra height
for safety in the case of a risk of flooding.
When the smaller units, positioned on single-
piece, metal baseplates, are placed directly on a
floor surface, only the anchor bolts need to be
imbedded in concrete
(fig. 2)
.
For the larger units and, in particular for those
mounted on a
welded steel-section baseplate
, it
is necessary to provide for a foundation base in
reinforced concrete to withstand the load and
strain derived from the unit and from the pipes, to
maintain the
alignment
and to avoid vibration of
the unit (see also
sections 3.1., 4.
).
Position the unit and provide support for the base-
plate with separators or wedges to obtain proper
horizontal alignment with a spirit-level, leaving
between the baseplate and the rough scarfed sur-
face of the foundation a clearance of 1-2 inches
(25÷50mm) for the grouting.
With the welded metal baseplates, it is sufficient
for the grout to rise a little above the lower part to
allow for imbedding of the anchor bolts and to
provide a stable base with uniform distribution of
the load over the support surface of the baseplate
(fig. 3)
.
Tighten uniformly all anchor bolts when the grout
has become solid (normally at least 48 hours after
pouring).
9
Fig. 1 Sling with ropes for lifting the pump-motor unit.
Fig. 2 Foundation for unit mounted on single-piece,
channel-steel baseplate.
Fig. 3 Foundation for unit mounted on welded,
steel-section baseplate.
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4.93.038
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