Grundfos CR 95 User Manual

English (GB)
22
9. Technical data
9.1 Operating conditions
9.1.1 Ambient temperature and altitude
See the instructions for the motor which are supplied
with the pump.
9.1.2 Maximum system pressure and liquid
temperature
The maximum permissible system pressure and
liquid temperature are stated on the nameplate
which is placed on the pump. For identification of the
nameplate data, see section 5.1.1 Nameplate.
9.1.3 Maximum permissible operating pressure
and liquid temperature for the shaft seal
The operating range of a shaft seal depends on the
operating pressure, the liquid temperature and the
type of shaft seal.
The selection charts show which shaft seals are
suitable at a given temperature and a given
pressure.
See figs 26 and 27. The charts apply to clean water.
Shaft seals for ∅22 shaft ends: CR, CRN with
motors up to and including 55 kW
Fig. 26 Maximum permissible operating
pressure and liquid temperature for
pumps with ∅22 shaft seal ( ≤ 55 kW)
Shaft seals for ∅28 (75-110 kW) and ∅36 (132-200
kW) shaft ends
Fig. 27 Maximum permissible operating
pressure and liquid temperature for
pumps with ∅28 shaft seal (75-110 kW)
and ∅36 shaft seal (132-200 kW)
9.1.4 Minimum inlet pressure
Fig. 28 Schematic view of open system with a
CR pump
Calculate the maximum suction lift "H" in m head as
follows:
If the calculated "H" is positive, the pump can
operate at a suction lift of maximum "H" m head.
If the calculated "H" is negative, an inlet pressure of
minimum "H" m head is required. There must be a
pressure equal to the calculated "H" during
operation.
TM06 1408 2314
TM06 1409 2617
-40 -20 0 20 120 14040 60 80 100
0
10
20
30
40
50
HQQE/V
HQQE/V
HQQE
HQQE
p [bar]
t [°C]
-40 -20 0 20 120 14040 60 80 100
0
10
20
30
40
50
HQQE/V
HQBE/V
HQQE/V
HQQE
HQBE
HQQE
p [bar]
t [°C]
TM02 0118 3800
H = Pb x 10.2 - NPSH - Hf - Hv
Pb = Barometric pressure in bar.
Barometric pressure can be set to 1 bar.
In closed systems, Pb indicates the system
pressure in bar.
NPSH = Net Positive Suction Head in m head, to be
read from the NPSH curve on page 24 at
the highest flow the pump will be delivering.
Hf = Friction loss in the inlet pipe in m head at
the highest flow the pump will be delivering.
Hv = Vapour pressure in m head. See Fig. E on
page 28.
tm = Liquid temperature.
Hv
H
NPSH
Pb
Hf

Grundfos CR 95 Specifications

General

Brand	Grundfos
Model	CR 95
Category	Water Pump
Language	English