N, N40 pages

09/2013

N, N4

End-Suction Centrifugal Pumps
standardized EN 733
Construction
Single-stage end-suction centrifugal pumps, with bearing
bracket.
Nominal duty points and main dimensions in accordance with
EN 733. Back Pull-Out construction, for simple and quick
dismantling and reassembly.
N, N4: version with pump casing and lanter bracket in cast iron.
B-N, B-N4: version with pump casing and lanter bracket in bronze.
(the pumps are supplied fully painted).
Rated speed of rotation (50 Hz):

N ≈ 2900 rpm.
N4 ≈ 1450 rpm.

Connections: PN 10 flanges EN 1092-2.
Counter-flanges (on request)
Sizes
Flanges
from 32-160 to 50-250
Screwed flanges PN 16 EN 1092-1
from 65-125 to 150-400 Flanges for welding
PN 10 EN 1092-1
Shaft sealing
– Standardized mechanical seal in accordance with ISO 3069.
– Stuffing box seal (on request).

Applications
For clean liquids, without abrasives, which are non-aggressive
for the pump materials (contents of solids up to 0.2%).
For water supply.
For heating, air conditioning, cooling and circulation plants.
For civil and industrial applications and for agriculture.
For fire fighting applications.
For irrigation.

Operating conditions
Liquid temperature from -10 °C to +90 °C.
Ambient temperature up to 40 °C.
Total suction lift up to 7 m.
Maximum permissible working pressure up to 10 bar.
Maximum permissible rotation speed: see table on page 70.

Pump-Motor unit

The electropumps N, B-N, N4, B-N4 series comply with the European
Regulation no. 547/2012 in force starting from 01.01.2013.

Materials
Components
Pump casing
Casing cover
Impeller

Shaft
Shaft sleeve
Mechanical seal
Counter-flanges

N, N4
N, N4
B-N, B-N4
Mechanical seal
Stuffing box
Mechanical seal
Cast iron
Bronze
GJL 200 EN 1561
G-Cu Sn 10 EN 1982
Cast iron
Bronze
GJL 200 EN 1561
G-Cu Sn 10 EN 1982
Brass P- Cu Zn 40 Pb 2 UNI 5705
For 32-125, 32-160, 32-200, 40-200
Chrome steel
Cr-Ni-Mo steel
Carbon steel
1.4104 EN 10088
1.4401 EN 10088
C 40 UNI 7845
(AISI 430)
(AISI 316)
Bronze
_
_
G-Cu Sn5 Zn5 Pb5 EN 1982
with chromate surface
_
Carbon - Ceramic - NBR
Carbon - Ceramic - NBR
Steel Fe 430B UNI 7070

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N,N4 pump connected to a standard electric motor in B3
construction form (EN 60072-1), by means of a baseplate,
driven by a flexible coupling and with coupling protection.
Three-phase 400 V , 50 Hz
classification scheme IE2 for three-phase motor from 0,75 kW.
IP 55 protection.
Motor suitable for operation with frequency converter.

Special features on request
- Special mechanical seal.
- Chrome-nickel steel AISI 316 pump-shaft.
- Higher or lower liquid or ambient temperatures.
- Other motor protection.
- Explosion proof construction in accordance with Directive
94/9 EEC (ATEX).
- Motor for other voltage.
- Frequency 60 Hz (as per 60 Hz data sheet).

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