Installation Procedures - Grundfos SPK Series Installation And Operating Instructions Manual

Installation Procedures

2. Three-Phase Motors:
SPK/CRK/MTR Pumps with three-phase motors must be
used with the proper size and type of motor-starter to
ensure the motor is protected against damage from low
voltage, phase failure, current imbalance and overloads.
A properly sized starter with manual reset and ambient-
compensated extra quick trip in all three legs should be
used. The overload should be sized and adjusted to the
full-load current rating of the motor. Under no
circumstances should the overloads be set to a higher
value than the full load current shown on the motor
nameplate. This will void the warranty.
Overloads for auto transformers and resistant starters
should be sized in accordance with the recommend-
ations of the manufacturer.
4. Glance Through This Guide
Even if you are very familiar with the installation of this
pump, a quick glance through the remaining sections of this
guide may help you avoid a potential problem.
Installation Procedures
Installing The Pump
Pump Location
Grundfos SPK/CRK/MTR pumps are
designed for tank-mounting and may
be installed in either a vertical or
horizontal orientation. Where the
unit is to be installed so as to
position its mounting flange below
the liquid level or in a pressurized
tank, a gasket must be fitted
between the pump's mounting flange
and tank.
Pump
∅ ∅ ∅ ∅ ∅ A
Model
SPK1/2/4/8 (NEMA) 5.5" (140) 6.3" (160) 7.1" (180) 1
SPK1/2/4 (IEC) 3.9" (100) 4.5" (115) 5.1" (130)
SPK8 (IEC) 5.5" (140) 6.3" (160) 7.1" (180) 1
CRK2/4 (NEMA) 5.5" (140) 6.3" (160) 7.1" (180) 1
CRK2/4 (IEC) 5.5" (140) 6.3" (160) 7.1" (180) 1
CRK8/16 (NEMA) 7.9" (200) 8.9" (225) 9.9" (250)
MTR32 7.5" (190) 8.7" (220) 9.9" (250) 2
MTR45/64 9.5" (240) 10.5" (265) 11.4" (290) 2
Pipework
The discharge ports of SPK/CRK pump units which are supplied
for use with NEMA motors have 1
Other discharge pipe sizes must be accommodated via the use
of appropriate adapter bushings.
Suction Conditions
The bottom of the pump strainer must be at least 1.0 inch 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.
Page 2
7.1" (180 mm)
C
6.3" (160 mm)
B
5.5" (140 mm)
A
⁄
3 "
8
/ "
Mounting
3 8
(9.5 mm) Holes (4)
Discharge
"
1 /
1 4
Female NPT
Mounting
∅ ∅ ∅ ∅ ∅ B ∅ ∅ ∅ ∅ ∅ C
Discharge Hole Dia.
⁄
1 " NPT 0.28" (7)
4
⁄
3
" BSPT 0.28" (7)
4
⁄
1 " BSPT 0.28" (7)
4
⁄
1 " NPT 0.37" (9.5)
4
⁄
1 " BSPT 0.30" (7.5)
4
2.0" NPT 0.35" (9)
⁄
1
" ANSI 0.47" (12)
2
⁄
1 " ANSI 0.47" (12)
2
⁄
1 inch female NPT threads.
4
At a liquid level between A and B mm above the bottom of the
strainer, the built-in priming screw will protect the pump against
dry running.
MTR32, 45 and 64 pumps have no priming screw.
Figure 1: CRK2/4•SPK1/2/4/8
1"
In general, it is recommended that
the pump strainer be located as near
as possible to the bottom of the tank.
Figure 2: CRK8/16
This maximizes first-stage
submersion in condensate transfer
applications and maintains fluid
velocities in cutting lubricant
applications (see Figure 4).
1"
Figure 3: MTR32/45/64
1"
Separation of Particles
Out of consideration for the pump, the distribution system, the
cutting tools and the treated materials, cooling/cutting fluids
should, wherever possible, be free of particles before entering
the pump unit. The system's requirements as to the purity of the
pumped fluid depend on the machining methods, the treated
materials and other criteria. Filtration methods should be
matched to these requirements. Larger particles are unable to
enter the pump with the pumped fluid due to the effect of the
built-in inlet screen; particles ∅ ∅ ∅ ∅ ∅ 2 mm or smaller are allowed to
enter the SPK and CRK pumps, and particles ∅ ∅ ∅ ∅ ∅ 4 mm or smaller
are allowed to enter the MTR pump.
Bypass
A bypass line or pressure relief valve should be installed in the
discharge pipe if there is any possibility the pump may operate
against a closed valve in the discharge line (or in any other no-
flow condition). Flow through the pump is required to ensure
adequate cooling and lubrication of the pump is maintained.
The following table shows minimum flow rates:
PUMP TYPE
SPK1
SPK2
SPK4
SPK8
CRK2
CRK4
CRK8
CRK 16
MTR 32 15 GPM up to 176°F (80°C)
35 GPM 176° - 194°F (80-70°C)
MTR45 20 GPM up to 176°F (80°C)
44 GPM 176° - 194°F
MTR64 28 GPM up to 176°F (80°C)
66 GPM 176°F - 194°F (80°C - 80°C)
PUMP TYPE A (IN.) B (IN.)
⁄ ⁄
CRK2/4 1 5 " 1 1
8
CRK8/16 2.0" 1.0"
⁄
SPK1/2/4/8 1 5 " 1.0"
8
⁄
MTR32/45/64 2 3 " –
4
Figure 4
MINIMUM FLOW RATE
1.0 GPM
1.2 GPM
3.0 GPM
5.3 GPM
1.2 GPM
3.0 GPM
5.3 GPM
8.5 GPM
"
8