Before Starting The Booster Module(S); Operation; Limitations To Operation - Grundfos BM Installations- Und Bedienungsanleitungen

9. Before starting the booster module(s)

The booster module(s) must be filled with water before startup.
Procedure:
1. Loosen the vent valve of the booster module, if any.
2. Ensure an inlet pressure on the booster module.
3. Completely open the isolating valve.
4. Wait 3 to 5 minutes to ensure optimum venting.
5. Tighten and clean the vent valve.
Checking the direction of rotation
Procedure:
1. Close the isolating valve on the outlet side of module 1
(figures 6 to 9) to approximately 1/3 of maximum flow rate.
2. Start module 1, and record outlet pressure and flow readings.
3. Stop the module, and interchange two of the phases to the
module.
4. Restart the module, and re-record outlet pressure and flow
readings.
5. Stop the module.
6. Compare the results taken under points 2 and 4. The
connection which gave the larger pressure and flow rate is the
correct direction of rotation.
The check of the direction of rotation should last for the shortest
possible time.
If the booster system has several modules, starting and rotation
checks must be made in the order 1-2-3-4 until all modules are
running. When module 2 is checked, module 1 must be running.
When module 3 is checked, modules 1 and 2 must be running,
etc.
If modules in series are also connected in parallel (fig. 8), the
direction of rotation of each section connected in series must be
checked.
After having checked the direction of rotation, stop the modules in
the order 4-3-2-1.
The booster system is now ready for operation.

10. Operation

Start
WARNING
Pressurised system
Death or serious personal injury
- The pump must not run against a closed outlet
valve for more than 5 seconds.
- Ensure a minimum liquid flow rate through the
pump by connecting a bypass or drain to the outlet
side of the pump. The drain can be connected to a
tank.
WARNING
Pressurised system
Death or serious personal injury
- Be aware of pressurised pipe systems even after
shutdown.
The booster modules must be started in the order 1-2-3-4 at
intervals of 1 to 2 seconds. See section
connected in series and in parallel. If other intervals are required,
contact Grundfos.
Module 1 is always the first module on the inlet side. During
startup, we recommend to close the isolating valve 3/4 and open
it slowly (2 to 3 seconds).
In systems involving the risk of water hammer in connection with
start/stop, the necessary measures must be taken to minimise
this risk, for example by installing a diaphragm tank.
5.1 Booster modules
Operation
During operation, the inlet pressure must be checked in
accordance with section 10.1 Limitations to
The total outlet pressure and flow rate of modules connected in
series must never be changed by stopping one or more of the
modules. If other pressures or flow rates are required, the
following procedures are applicable:
• Bypass of module(s): Install a bypass between two modules.
See fig. 9.
Stop the module(s) which is/are not required, and close the
isolating valves on either side of the module. See section
10.1.2 Flushing of the booster
The module(s) to be bypassed is/are always the last
module(s) in the flow direction.
• Fit a reducing valve to the outlet pipe.
The values stated in section
be observed.
• Modules with three-phase motors: Install a frequency
converter for speed control of the last booster module in the
flow direction. See section 7.1 Frequency converter
Stop
The modules must be stopped in reverse order, that is 4-3-2-1, at
intervals of 1 to 2 seconds. See section
connected in series and in parallel.
If the booster system is taken out of operation for a long period,
the modules must be flushed through with clean freshwater. See
section 10.1.2 Flushing of the booster
then left with freshwater until they are to be used again.

10.1 Limitations to operation

The flow limits stated in the table below apply to the optimum
operating ranges of the modules as regards efficiency.
Recommended flow rate at 25 °C / 77 °F
3
m /h
Type
50 Hz
BM 3A 0.8 - 4.4
BM 5A 2.5 - 6.8
BM 9 4.0 - 11
BM/BMhp 17 8-22
BM/BMhp 30 15-38
BM/BMhp 46 24-60
BM/BMhp 60 30-75
BM/BMhp 77 38-96
BM/BMhp 95 47-118
BM/BMhp 125 62-156
BM/BMhp 160 78-195
BM/BMhp 215 98-265
operation.
module.
10.1 Limitations to operation must
operation.
5.1 Booster modules
module. The modules are
US gpm
60 Hz 50 Hz 60 Hz
1.0 - 4.7 3.5 - 20 4.4 - 21
3.0 - 7.7 11-30 13-34
4.8 - 11 17-48 21-48
10-26 35-176 44-115
19-45 66-167 84-198
28-72 106-264 123-317
37-90 132-330 163-396
47-120 167-422 207-528
57-143 207-520 251-629
75-187 273-686 330-823
90-215 343-858 396-946
115-310 431-1166 506-1364
11