Pump Location; Suction Conditions - Grundfos CRK 2 Serie Instrucciones De Instalación Y Funcionamiento

4.1 Pump location

The pump is designed for tank mounting in vertical
position. The pump is positioned in a hole cut into
the cover of the tank (upper side) and is secured to
the tank by four hexagon head screws through the
holes in the mounting flange. It is recommended to fit
a sealing gasket between the pump flange and tank.
If the pump is to be installed horizontally, the drain
hole of the motor stool must be fitted with a plug.
Note: MTR 32, 45 and 64 pumps can only be
mounted in vertical position.
Fig. 1
c
L
D1
D2
D3
Pump mounting flange dimensions:
Pump type D1 D2
CRK 2 and 4 140 160 180 100 Rp 1¼ ø7.5
CRK 8 and 16 200 225 250 125
CHK 2 and 4 140 160 180 121 Rp ¾
SPK 1, 2 and 4 100 115 130
SPK 8 140 160 180 100 Rp 1¼ ø7.5
MTH 8, 12 and
180 210 200 100 Rp 1¼
16
MTR 32 190 220 250 150 DN 65 ø12
MTR 45 and 64 240 265 290 165 DN 80 ø12

4.2 Suction conditions

The bottom of the pump strainer must be at least
25 mm above the bottom of the tank.
The pumps are designed to provide full performance
down to a level of A mm above the bottom of the
strainer.
At a liquid level between A and B mm above the bot-
tom of the strainer, the built-in priming screw will pro-
tect the pump against dry running.
Note: MTR 32, 45 and 64 pumps have no priming
screw.
CRK 2 and 4
CRK 8 and 16
CHK 2 and 4
SPK 1, 2, 4 and 8
MTH 8, 12 and 16
MTR 32, 45 and 64
Fig. 2
CRK 2, 4, CHK 2, 4, SPK 1, 2, 4 and 8
4 x X
Fig. 3
CRK 8 and 16
D3 L C X
Fig. 4
MTH 8, 12 and 16
Rp 2 ø9
ø7
64 Rp ¾ ø7.5
ø9
Fig. 5
MTR 32, 45 and 64
Pump type A [mm]
41
50
37
40
40
70
B
25 mm
B
25 mm
25 mm
25 mm
B [mm]
28
25
22
25
25
–
A
A
B A
A
5