Grundfos BMST Series User manual

BMS
BMS hs, BMST, BMSX
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

Declaration of conformity
2
Declaration of conformity
GB: EC declaration of conformity
We, Grundfos, declare under our sole responsibility that the product
BMS, to which this declaration relates, is in conformity with these Council
directives on the approximation of the laws of the EC member states:
— Machinery Directive (2006/42/EC).
Standard used: EN 809:2009.
— EMC Directive (2004/108/EC).
Standards used: EN 61000-6-2:2005, EN 61000-6-3:2007.
This EC declaration of conformity is only valid when published as part of
the Grundfos installation and operating instructions (publication number
98567337 1013).
DK: EF-overensstemmelseserklæring
Vi, Grundfos, erklærer under ansvar at produktet BMS som denne
erklæring omhandler, er i overensstemmelse med disse af Rådets
direktiver om indbyrdes tilnærmelse til EF-medlemsstaternes lovgivning:
— Maskindirektivet (2006/42/EF).
Anvendt standard: EN 809:2009.
— EMC-direktivet (2004/108/EF).
Anvendte standarder: EN 61000-6-2:2005, EN 61000-6-3:2007.
Denne EF-overensstemmelseserklæring er kun gyldig når den publiceres
som en del af Grundfos-monterings- og driftsinstruktionen (publikations-
nummer 98567337 1013).
Bjerringbro, 10th May 2010
Jan Strandgaard
Technical Director
Grundfos Holding A/S
Poul Due Jensens Vej 7
8850 Bjerringbro, Denmark
Person authorised to compile technical file and
empowered to sign the EC declaration of conformity.

English (GB)
3
English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
2. Product introduction
Grundfos BMS, BMST and BMSX booster systems are designed
for desalination of seawater or brackish water in reverse osmosis
systems, the so-called SWRO systems (SWRO = Sea Water
Reverse Osmosis). The design of the systems ensure high
energy recovery.
2.1 Delivery and handling
2.1.1 Delivery
The pumps are supplied from the factory in proper packing in
which they should remain until installation.
2.1.2 Frost protection
If the pumps have to be stored, the location must be frost-free.
1. Symbols used in this document 3
2. Product introduction 3
2.1 Delivery and handling 3
2.2 Nameplate 4
2.3 Commissioning 4
2.4 Pumped liquids 4
2.5 Filtration 4
2.6 Flushing and salinity 4
2.7 Foundation 4
3. Before installation 5
3.1 Reading guide 5
4. Mechanical installation 5
4.1 BMS hs pump 5
4.2 BMST system 8
4.3 BMSX system 10
5. Electrical installation 11
5.1 BMS hs pump 11
5.2 BMS hp pump 11
5.3 BMST system 11
5.4 BMSX system 11
6. Commissioning 11
6.1 BMS hs system 11
6.2 BMST system 12
6.3 BMSX system 13
6.4 Low-pressure flow control 15
7. Shutdown 15
7.1 BMS hs system 15
7.2 BMST system 16
7.3 BMSX system 16
7.4 Flushing 17
8. Operation 17
8.1 Motor bearings 17
9. Periods of inactivity 17
9.1 Startup after a period of inactivity 17
10. Fault finding 18
10.1 BMS hs and BMST 18
10.2 BM hp 19
10.3 Pressure exchanger 20
11. Checking the motor and cable 21
12. Technical data 22
13. Disposal 22
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
If these safety instructions are not observed,
it may result in personal injury.
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Warning
The sound pressure level is so high that hearing
protection must be used.
Note
Notes or instructions that make the job easier
and ensure safe operation.
Caution
During delivery and storage, the pumps must
never be preserved with glycerine or similar
liquids which are aggressive to the pump
materials.

English (GB)
4
2.2 Nameplate
Fig. 1 Nameplate
2.3 Commissioning
Commissioning of BMSX booster systems must be carried out by
certified Grundfos employees to ensure long and trouble-free
operation.
Commissioning includes onsite training of the people who will be
responsible for maintaining and monitoring the system.
2.4 Pumped liquids
Thin, non-explosive liquids, not containing solid particles or
fibres. The liquid must not chemically attack the pump materials.
In case of doubt, contact Grundfos.
The pumps must never operate with water/liquid containing
substances which would remove the surface tension, e.g. soap.
If this type of detergent is used to clean the system, the water/
liquid must be led around the pumps via a bypass.
2.5 Filtration
BMS hs, BMST: The raw water must be filtered to maximum
30 microns.
BMSX: The raw water must be filtered to maximum 10 microns.
Fig. 2 Filtration
2.6 Flushing and salinity
When the booster system is stopped, it is very important to flush
the system according to these guidelines.
See also the flush procedure in section 9.1.1 Frequency of starts
and stops.
2.7 Foundation
The foundation must be constructed to safely support the booster
system or pump(s) under all conditions. The pump and motor
must be installed at the same level.
The foundation must be strong enough to support the weight of
the both units.
2.7.1 Vibration dampening
The vibration dampeners supplied with the BMS hs pump must be
used.
TM05 9242 3613
Pos. Description
1 Type designation
2
Model designation:
• generation
• product number
• production code (ddmmyy).
3 Rated flow rate
4 Rated head
5 Rated speed
6 Minimum and maximum inlet pressure
7 Maximum discharge pressure
8 Minimum and maximum liquid temperature
9 Net weight of booster module
10 Minimum efficiency index
11 Country of origin
12 CE mark
13 TR mark
Note
If this requirement is not met, the warranty will be
invalidated.
Warning
The pumps must not be used for pumping
flammable or combustible liquids such as diesel
oil, petrol or similar liquids.
N/A
1
2
3
4
5
6
7
8
9
10
11 12 13
TM05 8862 2813
Pos. Description
1 Raw-water feed pump
2 Pressure gauge (raw water)
3 Low-pressure switch
4Flowmeter
5 Pressure gauge (fresh-water pump)
6 Fresh-water flush pump
Pump type Filter
[micron absolute]
BMS hs 30
BM hp 30
BMST 30
Pressure exchanger 10
Pump type Fresh water pmin
[bar]
Max. salinity
[ppm TDS] Flush time [min.]
BMS hs 2 1000 5-10
BM hp 2 1000 5-10
BMST 2 1000 5-10
Pressure
exchanger 2 1000 5-10
1
2
3
4
5
6
Filter

English (GB)
5
3. Before installation
1. Check that the pump has not been damaged during
transportation.
2. Check that the type designation corresponds to the order.
See the pump nameplate.
3. Compare the motor voltage and frequency details on the
motor and frequency converter nameplates with the power
supply available.
3.1 Reading guide
Select system/pump type.
4. Mechanical installation
4.1 BMS hs pump
The pump can be mounted directly on the floor or on a base
frame (accessory).
Fig. 3 BMS hs pump
4.1.1 Location
To ensure sufficient cooling of the motor, a free space of minimum
100 mm behind the motor (NDE) is required.
4.1.2 Lifting and handling the motor
Use all lifting eyes when lifting the motor, and lower it down
slowly.
Fig. 4 Example of how to lift the motor
The positions of the lifting eyes and the minimum dimensions of
the lifting bars are shown below.
Fig. 5 Dimensions of lifting equipment
System/
pump Step Action Section
BMS hs
1Mechanical
installation 4.1 BMS hs pump.
2Electrical
installation 5.1 BMS hs pump.
3 Commissioning 6.1 BMS hs system.
BMST
1Mechanical
installation 4.2 BMST system.
2Electrical
installation 5.3 BMST system.
3 Commissioning 6.2 BMST system.
BMSX
1Mechanical
installation 4.3 BMSX system.
2Electrical
installation 5.4 BMSX system.
3 Commissioning 6.3 BMSX system.
TM05 9569 4113
Warning
Observe local regulations concerning limits for
manual lifting or handling.
Warning
Use all lifting eyes on the motor, and make sure
that the crane is suitable for the job. Use certified
and approved lifting equipment. See nameplate.
TM05 9235 3613TM05 9556 3913
Horizontal position
Motor
type A [mm] e [mm] H [mm] ∅t [mm]
200 260 260 165 25
225 300 150
Caution
If these instructions are not followed, there is a
risk of warping or crushing some equipment
such as the terminal box, cover or drip cover.

English (GB)
6
4.1.3 Motor installation
The motor must be level. If there is a gap between the foundation
and motor, use a spirit level, a feeler gauge and shims to level the
motor. Then secure the motor by means of suitable bolts
depending on the foundation.
Direction of rotation
Connect the power supply (see section 5. Electrical installation)
and check the direction of rotation. The direction of rotation must
correspond to the direction under normal operation. See the
installation and operating instructions for the motor.
4.1.4 Lifting and handling the pump
Hoist the pump into place, and lower it down slowly.
Fig. 6 Example of how to lift the pump
Make the pump fit the motor flange. Fit the pump support foot
delivered with the product. Lower the pump until the support foot
reaches the floor.
4.1.5 Alignment of motor and pump
Align the motor and pump before you tighten the bolts. To ensure
correct installation, follow this procedure:
Caution
Use vibration dampers.
Warning
The electrical installation should be carried out
by an authorised person in accordance with local
regulations.
TM05 9236 3613
Step Description Picture
1
Fit all four bolts for
motor and pump
connection.
Do not tighten the
bolts yet.
TM05 9234 3613
2
Adjust the gap by
means of a feeler
gauge or similar tool.
Tighten one bolt by
hand.
TM05 9232 3613
3
Adjust the gap 180 °
opposite the bolt you
just tightened.
Do not tighten the
bolt. Move the pump
to adjust the gap.
TM05 9251 3613
4
Move the pump, and
adjust the gap by
means of the feeler
gauge. Tighten the
bolt by hand. If the
inlet pipe has to be
turned, see section
4.1.6 Position of the
inlet pipe.
TM05 9345 3613
5
When the gap has
been adjusted, cross-
tighten all bolts to
33 Nm.
TM05 9346 3613
6
Fasten the support
foot to the
foundation.
TM05 9345 3613
Caution
The support foot must not impose any tension on
the pump!

English (GB)
7
4.1.6 Position of the inlet pipe
If you want to change the position of the pipe, follow this
procedure.
4.1.7 Flushing the system
4.1.8 Pipe connection
Both the inlet and the discharge pipe are fitted with clamp liners
for Victaulic couplings and must be supported close to the end of
the pipe.
Fig. 7 Pipe support
When fitting the couplings, it is important to allow a gap of 3.5 mm
between the two pipes. See fig. 8.
Fig. 8 Gap between pipes
Step Description Picture
1Remove M10 bolts.
Loosen M12 bolts.
TM05 9347 3613
2Mark up the pump
sleeve and union nut.
TM05 9573 4013
3
Turn the inlet pipe to
the needed position,
and make sure the
union nut follows.
TM05 9343 3613
4 Check the marking.
TM05 9342 3613
5
Fit all bolts again.
Tighten all bolts to
33 Nm.
TM05 9343 3613
6
Fasten the support
foot to the
foundation.
TM05 9345 3613
Caution
To avoid impurities in the pump, flush the pipes
before you connect the pump inlet and discharge
pipes.
TM05 9230 3613
Caution
Avoid stress in the pipe system.
TM05 9344 3613
Service connector

English (GB)
8
Discharge pipe
In order to facilitate service of the pump and motor, it is important
that the delivered service connector is built into the system.
1. Fit the two rubber parts.
2. Install the service connector.
Fig. 9 Position of rubber parts
3. Move the two rubber parts over the service connector.
Fig. 10 Position of service connector and rubber parts
4. Fit the Victaulic couplings and tighten the bolts to 33 Nm.
Fig. 11 Victaulic couplings
If installing a BMS hs pump, you are now ready for electrical
installation. See section 5.1 BMS hs pump.
If building a BMST system, see section 4.2.2 Lifting and handling
the BMT pump.
If building a BMSX system, see section 4.3.2 Installation of BM hp
pump.
4.2 BMST system
A BMST system is built by using a BMS hs as primary pump and
a BMT as secondary pump. The BMT pump is driven by the high-
pressure concentrate from the membrane and used as feed pump
for the primary BMS hs pump.
Fig. 12 BMST system
Fig. 13 BMT pump
4.2.1 BMS hs pump installation
See section 4.1 BMS hs pump.
4.2.2 Lifting and handling the BMT pump
1. Hoist the pump into place, and lower it down slowly.
2. Install and secure the pump.
3. Support the pump close to the turbine, using the bracket
behind the turbine housing.
4. Use a clamp or similar device at the other end. See the
example in fig. 12.
4.2.3 BMT pump installation
The BMT pump must be level. If there is a gap between the
foundation/frame and the BMT pump, use a spirit level, a feeler
gauge and shims to level the pump. Then secure the pump by
means of suitable bolts depending on the foundation/frame.
4.2.4 Flushing the system
TM05 9339 3613TM05 9340 3613TM05 9341 3613
TM05 9334 3613TM05 9350 3613
Caution
Use vibration dampers.
Caution
To avoid impurities in the pump, flush the pipes
before you connect the pump inlet and discharge
pipes.

English (GB)
9
4.2.5 Inlet and discharge pipes (BMT and BMS hs pump)
The inlet and discharge pipes are fitted with clamp liners for
Victaulic couplings.
To ensure correct installation, follow this procedure.
The concentrate from the turbine must be able to flow freely to a
drain under all operating conditions. The minimum height above
the water level in the drain must be 300 mm. The tube from the
turbine to the drain must have the same diameter in its entire
length. The drain must be larger than the tube and open so that
the concentrate, a mixture of air and water (foam), can escape
freely.
Fig. 14 Drain from Pelton turbine
4.2.6 Pipe connection
Both the inlet and the discharge pipe must be supported close to
the end of the pipe.
Fig. 15 Horizontal and vertical support of pipes
When fitting the couplings, it is important to allow a gap of 3.5 mm
between the two pipes. See fig. 16.
Fig. 16 Position of clamp liners
Step Description Picture
1
The turbine is driven
by the high-pressure
concentrate from the
membrane.
Connect the high-
pressure outlet to the
BMT pump’s turbine
inlet.
TM05 9334 3613
2Connect the BMT
pump inlet.
TM05 9375 3613
3
Connect the BMT
pump and BMS hs
pump.
TM05 9336 3613
4
Connect the hose
(∅300) to the outlet
of the turbine housing
with a strap. Lead the
hose to a drain tank,
drain channel or a
similar drain. Fit the
end of the hose
above the highest
possible water level
in the drain. The hose
should be supported.
TM05 9337 3613
TM05 9474 5107
Caution
The concentrate outlet must be free under all
operating conditions.
Caution
If a discharge pipe is connected to the
concentrate outlet, this pipe must have an air
outlet.
TM05 9230 3613
Caution
Avoid stress in the pipe system.
TM05 9344 3613
Min. 300 mm
Min. 30°
Service connector

English (GB)
10
4.3 BMSX system
A BMSX system is built by using a BMS hs pump as high-
pressure pump and a BM hp pump as booster pump.
The pressure exchanger is installed in order to recover energy
from the high-pressure concentrate.
Fig. 17 BMSX system
4.3.1 Installation of BMS hs pump
See section 4.1 BMS hs pump.
4.3.2 Installation of BM hp pump
See the installation and operating instructions for Grundfos BM
and BM hp.
4.3.3 Pressure exchanger
Fig. 18 Pressure exchanger
Lifting and handling the pressure exchanger
Use suitable straps when lifting the unit. Carefully hoist the
pressure exchanger into place, and lower it down. Secure the
unit(s) to a frame, and ensure a stress-free installation.
4.3.4 Flushing the system
4.3.5 Pipe connection
Low-pressure and high-pressure inlet and discharge pipes are
fitted with clamp liners for Victaulic couplings. See the pipe
location on the unit.
Both the inlet and the discharge pipes must be supported close to
the end of the pipes.
Fig. 19 Horizontal and vertical support of pipes
When fitting the couplings, it is important to allow a gap of 3.5 mm
between the two pipes.
TM05 9569 4113 - TM05 9571 4113 - TM05 9570 4113 - Gr0559Gr-1015354
Warning
Observe local regulations concerning limits for
manual lifting or handling.
Warning
Make sure the crane is suitable for the job.
Use certified and approved lifting equipment.
See nameplate.
Caution
To avoid impurities in the pump, flush the pipes
before you connect the pump inlet and discharge
pipes.
TM05 9348 3613
Caution
Avoid stress in the pipe system.

English (GB)
11
5. Electrical installation
The electrical connection must be carried out by an authorised
electrician in accordance with local regulations and the diagrams
for the motor protection, starter and monitoring devices used.
The electrical connections are made in the terminal box.
Wiring must be done according to the wiring diagram supplied
with the Grundfos product.
5.1 BMS hs pump
See the installation and operating instructions for the drive and
motor.
If installing a BMS hs pump, you are now ready for
commissioning. See section 6.1 BMS hs system.
5.2 BMS hp pump
See the installation and operating instructions for Grundfos BM
and BM hp.
See the nameplate to identify the motor type and type of control
board.
5.3 BMST system
See section 5.1 BMS hs pump.
If installing a BMS hs pump, you are now ready for
commissioning. See section 6.2 BMST system.
5.4 BMSX system
See sections 5.1 BMS hs pump and 5.2 BMS hp pump.
If installing a BMS hs pump, you are now ready for
commissioning. See section 6.3 BMSX system.
6. Commissioning
These commissioning guidelines concern systems only.
– BMS hs system.
– BMST system (see section 6.2 BMST system).
– BMSX system (see section 6.3 BMSX system).
6.1 BMS hs system
6.1.1 Before startup
Follow these instructions to ensure correct startup of the BMS hs
system.
Check the following:
1. greasing of the motor bearings
2. power supply compared to the nameplate.
Fig. 20 Example of BMS hs booster system
Warning
Make sure that the power supply cannot be
accidentally switched on during electrical
installation.
The pump must be connected to an external
mains switch with a minimum contact gap of
3 mm in all poles.
The pump must be earthed.
Warning
The sound pressure level is so high that hearing
protection must be used.
TM05 8860 2813
Pos. Description
1 Raw-water feed pump
2 Pressure gauge (raw water)
3Filter
4 Low-pressure switch
5Flowmeter
6 BMS hs pump
7 High-pressure switch
8 Pressure gauge (BMS hs discharge pressure)
9Airvent
10 Pressure relief valve
11 Membrane filter
12 Permeate
13 Pressure control valve
14 Pressure gauge (fresh-water pump)
15 Fresh-water flush pump
1
2
3
4
5
6
7
8
12
13
11
9
14
15
10

English (GB)
12
6.1.2 Startup
If a discharge valve is installed, we recommend that you open the
valve 1/4 of a turn when starting the pump/system.
To start up a BMS hs system, proceed as follows:
1. Start the feed pump (1), and check that the inlet pressure (2)
of the BMS hs pump (6) is higher than 1.0 bar (10 metres
head) and lower than 35.0 bar (350 metres head).
2. Vent the BMS hs pump (6).
3. Start the BMS hs pump (6). Ramp up the BMS hs pump (6)
according to factory settings. See fig. 21 (1 and 2).
Fig. 21 Ramp up
Default ramp-up time:
• 0 to 1700 rpm max. 3 seconds (1).
• Ramp up from 1700 rpm is set to 1500 rpm per minute (2).
4. Set the discharge pressure of the pump (8) to the desired
value. See fig. 20.
5. Check that the inlet pressure (2) of the pump is higher than
1.0 bar (10 metres head) and lower than 35.0 bar (350 metres
head).
6.2 BMST system
6.2.1 Before startup
Follow these instructions to ensure correct startup of the BMST
system.
Check the following:
1. greasing of the motor bearings
2. power supply compared to the nameplate
3. pipework compared to the diagram.
Fig. 22 Example of BMST booster system
Note
Never operate pumps against a closed valve.
Caution
Ensure a ramp-up time of 0-1700 rpm within
3 seconds.
TM05 8860 2813
Caution
Make sure that the BMS hs pump is protected by
a low-pressure switch or flow switch.
2
3
1
4
rpm
3 seconds t [seconds]
1700
TM05 8861 2813
Pos. Description
1 Raw-water feed pump
2 Pressure gauge (raw water)
3Filter
4 Low-pressure switch
5Flowmeter
6 BMT pump
6.1 BMS hs pump
7 Pressure gauge (BMST discharge pressure)
8Flowmeter
9Airvent
10 High-pressure switch
11 Pressure relief valve
12 Membrane filter
13 Permeate
14 Pressure gauge (high-pressure concentrate)
15 Pressure gauge (fresh-water pump)
16 Fresh-water flush pump
1
2
4
3
5
6
6.1
7
14
13
12
15
16
8
109
11

English (GB)
13
6.2.2 Startup
To start up a BMST system, proceed as follows:
1. Start the raw-water feed pump (1), and check that the inlet
pressure (2) of the pump is higher than 2.0 bar (20 metres
head) and lower than 5.0 bar (50 metres head).
2. Vent the BMT pump (6).
The pump is fully vented when liquid runs out of the air vent
(9).
3. Start the BMS hs pump (6.1). See section 6.1.2 Startup.
4. Set the discharge pressure (7) of the pump to the desired
value.
5. Check that the inlet pressure (2) of the pump is higher than
2.0 bar (20 metres head) and lower than 5.0 bar (50 metres
head).
6. The system is now ready for operation.
6.3 BMSX system
6.3.1 Flow control and balancing
Flow rates and pressures in a typical BMSX system vary slightly
over the life of the system due to temperature variations,
membrane fouling and feed salinity variations. The rotor of the
pressure exchanger is powered by the flow of fluid through the
unit. The speed of the rotor is self-adjusting over the operating
range of the pressure exchanger pump.
6.3.2 Before startup
Follow these instructions to ensure correct startup of the BMSX
system.
Check the following:
1. greasing of the motor bearings (see nameplate)
2. power supply compared to the nameplate
3. pipework compared to the diagram.
Fig. 23 Example of BMSX booster system
Caution
Make sure that the BMS hs pump is protected by
a low-pressure switch or flow switch.
Caution
Ensure a ramp-up time of 0-1700 rpm within
3 seconds.
TM05 8856 3713
Pos. Description
1 Raw-water feed pump
2Filter
3 Low-pressure switch
4Flowmeter
5 Pressure gauge (raw water)
6 BMS hs pump
7 Non-return valve
8 Pressure gauge (BMS hs discharge pressure)
9Airvent
10 High-pressure switch
11 Pressure relief valve
12 Pressure gauge (BM hp inlet pressure)
13 Pressure gauge (BM hp discharge pressure)
14 BM hp pump
15 Flowmeter (high-pressure raw water)
16 Pressure gauge (low-pressure raw water)
17 Flowmeter (low-pressure raw water)
18 Membrane filter
19 Permeate
20 Cleaning flush valve.
21 Pressure gauge (high-pressure concentrate)
22 Pressure gauge (low-pressure concentrate)
23 Pressure exchanger
24 Concentrate valve
25 Pressure gauge (fresh-water pump)
26 Fresh-water flush pump
1
2
34
16
15
14
12
8
910 11
18
19
20
13
21
22
24
23
17
5
6
7
25
26

English (GB)
14
6.3.3 Startup
To start up a BMSX system, proceed as follows:
1. All valves should be in their normal operating positions.
2. Start the raw-water feed pump (1). When the raw-water feed
pump is started, the system is filled with water. Ensure that
the entire system is vented. The feed flow (17) (max. 10 bar,
min. 2 bar feed pressure) through the pressure exchanger
pump (23) may or may not cause the rotor to begin to rotate.
Rotation will be confirmed by a humming noise.
Fig. 24 Start the seawater feed pump
3. Adjust the concentrate valve (24) to the system flow.
4. Vent the system.
5. When you have filled the system with water and vented it,
then see the BM hp startup procedure.
6. Start the BM hp pump (14).
Fig. 25 System pressure and flow, BM hp
The rotor speed will increase, and remaining air will be released
from the pressure exchanger. Vent any remaining air from the
system.
Adjust the frequency converter of the BM hp pump (14) on the
discharge side of the pressure exchanger (23) until the low-
pressure seawater inlet flow (17) equals the calculated seawater
flow (15).
Fig. 26 Balanced flows
To achieve a balanced flow through the pressure exchanger (23),
use the flowmeters installed on the low-pressure seawater inlet
pipe (17) and the high-pressure seawater pipe (15). All flows in
and out of the pressure exchanger (23) should be balanced to
within 5 % for optimum operation.
TM05 8863 2813
Caution
The maximum flow rate of the pressure
exchanger must never be exceeded. See the
nameplate of the pressure exchanger.
The BM hp pump must not run against a closed
discharge valve for more than 5 seconds as this
will cause an increase in the temperature/
formation of steam in the pump which may
damage the pump and motor. If there is any risk
of the BM hp pump running against a closed
discharge valve or risk of no flow, ensure a
minimum liquid flow through the pump by
connecting a bypass/drain to the discharge side
of the pump. The drain can be connected to a
tank.
1
2
34
16
15
14
12
8
7
910
18
19
20
13
21
22
24
23
17
5
6
25
26
11
TM05 8864 2813TM05 8864 2813
Note
Operating the pressure exchanger with
unbalanced flows may result in contamination of
the seawater feed by the concentrate and
consequently lower efficiency.
1
2
34
16
15
14
12
8
7
910
18
19
20
13
21
22
24
23
17
5
6
25
26
11
1
2
34
16
15
14
12
8
7
910
18
19
20
13
21
22
24
23
17
5
6
25
26
11

English (GB)
15
A lower flow in the seawater inlet than the seawater discharge will
result in lower-quality permeate, increased feed pressure and
higher energy consumption. We recommend that you use a
slightly oversized BM hp pump (14) to handle projected
membrane concentrate flows, taking into account seasonal
variations, membrane fouling and manifold losses. The flow and
pressure of the BM hp pump (14) must be controlled with a
frequency converter.
To start up the BMS hs pump, proceed as follows:
1. Start the BMS hs (6). See section 6.1.2 Startup.
Fig. 27 System in operation
The BMSX system pressure will increase. The sound pressure
level from the pressure exchanger (23) will increase.
Small variations in sound pressure level and rotor speed are
normal.
6.4 Low-pressure flow control
The concentrate valve (24) on the discharge side of the system
must be adjusted to control the flow rate of the low-pressure
seawater inlet (17) and low-pressure concentrate discharge (22)
(min. 1 bar backpressure). This valve (24) also adds
backpressure on the pressure exchanger (23) required to prevent
destructive cavitation. The low-pressure seawater inlet flow (17)
equals the high-pressure concentrate inlet flow (15).
7. Shutdown
Carefully follow these instructions to safely shut down your
booster system.
7.1 BMS hs system
This procedure describes how to shut down the BMS hs system.
Fig. 28 Example of BMS hs system
Procedure
1. Ramp down the BMS hs pump (6) according to factory
settings. See fig. 29 (3 and 4).
Fig. 29 Ramp down
2. Stop the seawater feed pump (1).
3. Start the fresh-water flush pump (15), and flush the system
with fresh water (14) (min. 2 bar for flushing).
4. Flush the system for 5 to 10 minutes or until the salinity is
lower than 1000 ppm TDS.
5. Stop the fresh-water pump (15).
6. Close all valves to keep the fresh water in the system during
shutdown.
Caution
Neither the low-pressure nor the high-pressure
flow through the pressure exchanger must ever
exceed the rated maximum flow. The only reliable
way to determine the flows is to use a low-
pressure flowmeter (16) or a high-pressure
flowmeter (14), respectively.
TM05 8857 2813
1
2
34
16
15
14
12
7
9
810
18
19
20
13
21
22
24
23
17
5
6
25
26
11
TM05 8860 2813TM05 8860 2813
Caution
Ramp down from 1700 to 0 rpm in 3 seconds.
Caution
To flush the thrust bearing of the BMS hs pump,
start the pump for 30 seconds to allow the fresh
water to enter into the thrust bearing.
Note
If the flushing takes more than 10 minutes, the
flow must be reduced to maximum 10 % of the
rated flow rate.
Note
During periods of inactivity, the pump must be
filled with clean fresh water.
1
2
3
4
5
6
7
8
12
13
11
9
14
15
10
1000 ppm TDS
2
3
1
4
rpm
3 seconds t [seconds]
1700

English (GB)
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7.2 BMST system
This procedure describes how to shut down the BMST system.
Fig. 30 Example of BMST system
Procedure
1. Ramp down the BMS hs pump (6.1) according to factory
settings.
2. Stop the seawater feed pump (1).
3. Start the fresh-water flush pump (16), and flush the system
with fresh water (15) (min. 2 bar for flushing).
4. Flush the system for 5 to 10 minutes or until the salinity is
lower than 1000 ppm TDS.
5. Stop the fresh-water pump (16).
6. Close all valves to keep the fresh water in the system during
shutdown.
7.3 BMSX system
This procedure describes how to shut down the BMSX system.
Fig. 31 Example of BMSX system
Procedure
1. Ramp down and stop the BMS hs pump (6).
See section 7.1 BMS hs system.
2. Ramp down and stop the BM hp pump (14).
3. Stop the seawater feed pump (1).
4. Start the fresh-water flush pump (26), and flush the system
with fresh water (15) (min. 2 bar for flushing).
5. Start the BM hp pump (14), ramp it up to 25 Hz and let it run
for 5 to 10 minutes or until the salinity is lower than 1000 ppm
TDS. To ensure efficient flushing of the system, open the
valve (20).
6. Start the BMS hs pump (6) and ramp it up to minimum
1700 rpm or until the salinity is lower than 1000 ppm TDS.
7. Stop the BMS hs pump (6), the BM hp pump (14) and the
fresh-water flush pump (26).
8. Close all valves to keep the fresh water in the system during
shutdown.
9. If the system is taken out of operation for a longer period,
precautions should be taken to inhibit biological growth.
The system units should receive a final flush with the same
solution used to preserve the membranes.
TM05 8861 2813
Caution
To flush the thrust bearing of the BMS hs pump,
start the pump for 30 seconds to allow the fresh
water to enter into the thrust bearing.
Note
If the flushing takes more than 10 minutes, the
flow must be reduced to maximum 10 % of the
rated flow rate.
Note
During periods of inactivity, the pump must be
filled with clean fresh water.
1
2
4
3
5
6
6.1
7
14
13
12
15
16
8
109
11
TM05 8856 3713
Note
If the flushing takes more than 10 minutes, the
flow must be reduced to maximum 10 % of the
rated flow rate.
Note
During periods of inactivity, the pump must be
filled with clean fresh water.
Caution
To flush the thrust bearing and shaft seal of the
BMS hs pump, start the pump for minimum
30 seconds to allow the fresh water to enter into
the thrust bearing housing.
1
2
34
16
15
14
12
8
910 11
18
19
20
13
21
22
24
23
17
5
6
7
25
26
1000 ppm TDS

English (GB)
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7.4 Flushing
BMS pumps can be flushed in the flow direction.
Flushing of the booster pumps is very important, especially when
the pumps are used for pumping salt water or water with
chemicals.
If salt water is left in the pumps while they are stopped, there is a
risk of crevice corrosion of the stainless steel.
If water containing chemicals is left in the pumps while they are
stopped, the rubber parts of the pump or motor may be affected.
In case the cleaning solution contains chemicals which may affect
the rubber in the pump and motor, a bypass must be installed.
8. Operation
Check the following at suitable intervals:
• flow rate and pressure
• whether the noise level has changed.
We recommend that you write the operating data in a log book as
they may be useful in connection with maintenance.
8.1 Motor bearings
The pumps are factory-fitted with a manual motor-bearing
greasing system. For greasing intervals, etc., see the motor
nameplate or the installation and operating instructions supplied
with the motor.
8.1.1
Type of grease
As standard, the grease type is EXXON MOBILE POLYREX
EM103, and we recommend that you use this type for subsequent
lubrication.
9. Periods of inactivity
Prior to periods of inactivity, various precautions must be taken to
protect the system.
The specific precautions to be taken if the system is to be inactive
for a certain period appear from the table:
* Use the same solution that is used to preserve the
membranes.
9.1 Startup after a period of inactivity
9.1.1 Frequency of starts and stops
We recommend:
minimum 1 per year
maximum 5 per hour
maximum 20 per day.
Note
Avoid mixing greases.
Action More than
30 minutes More than 1 month More than 3 months
Flush the pump.
See section
9.1.1 Frequency of
starts and stops.
xxx
Fill the pump with
fresh water. xxx
Preserve the pump.* x x
Rotate the pump
and motor shafts
manually once a
month.
x
Caution
The normal stop procedure must be followed
step by step.
Caution
The normal startup procedure must be followed
step by step. For greasing of motor bearings, see
section 8.1 Motor bearings.

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10. Fault finding
10.1 BMS hs and BMST
Warning
Before starting work on the product, switch off
the power supply. Make sure that the power
supply cannot be accidentally switched on.
Fault Possible cause Remedy
1. The pump stops/starts
occasionally during
operation.
a) No water supply.
The low-pressure switch has cut out.
Check that the low-pressure switch functions normally
and is adjusted correctly. Check that the minimum inlet
pressure is correct. If not, check the feed pump.
See section 6.1.2 Startup.
2. The pump stops during
operation.
a) The fuses are blown. After a cut-out, the cause of a possible short circuit must
be found.
If the fuses are hot when they are replaced, check that
the load of the individual phases does not exceed the
motor current during operation. Identify the cause of the
load.
If the fuses are not hot immediately after the cut-out,
then identify the cause of a possible short-circuit.
Check all fuses in the control circuit and replace
defective fuses.
b) The frequency converter has tripped. Reset the frequency converter.
c) The motor/supply cable is defective. Check the motor and cable.
3. The pump runs, but
generates no pressure
and delivers no water.
a) No or insufficient water supply to the pump. Check that the inlet pressure during operation is at least
1 bar for BMS hs and 2 bar for BMST. If so, the water
supply is OK. Stop and vent the system.
Restart the pump as described in sections 6.1 BMS hs
system and 6.2 BMST system. Check the functioning of
the pump.
b) The pipe system, pump or nozzle is clogged. Check the pipe system, pump and nozzle.
c) The prefilter is clogged. Clean the prefilter.
4. The pump runs at
reduced capacity.
a) The valves on the discharge side are partly
closed or blocked. Check the valves.
b) The discharge pipe is partly blocked by
impurities.
Clean or replace the discharge pipe. Measure the
discharge pressure and compare the value with the
calculated data. See the "Technical specifications"
supplied with the system.
c) The pump is partly blocked by impurities. Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace any defective parts.
d) The pump is defective. Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace any defective parts.
e) The prefilter is clogged. Clean the prefilter.

English (GB)
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10.2 BM hp
Warning
Before starting work on the product, switch off
the power supply. Make sure that the power
supply cannot be accidentally switched on.
Fault Possible cause Remedy
1. The pump stops
occasionally during
operation.
a) No or insufficient water supply. The pressure
switch has cut out.
Check that the pressure switch functions normally
(without delay) and is adjusted correctly. Check that the
minimum inlet pressure is correct.
b) The capacity is too small. The flow switch
has cut out.
The discharge pipe is totally or partly blocked due to
incorrect adjustment of a manually operated valve or
failure in the solenoid valve or the motor-operated valve.
Check these valves.
The flow switch is faulty or incorrectly adjusted.
Check/adjust the switch.
2. The pump does not run. a) The fuses are blown. After a cut-out, the cause of a possible short circuit must
be found.
If the fuses are hot when they are replaced, check that
the load of the individual phases does not exceed the
motor current during operation. Identify the cause of the
load.
If the fuses are not hot immediately after the cut-out,
then identify the cause of a possible short-circuit.
Check all fuses in the control circuit and replace
defective fuses.
b) The frequency converter has tripped. Reset the unit.
c) The motor/supply cable is defective. Check the motor and cable. See section 5. Electrical
installation.
3. The pump runs, but
generates no pressure
and delivers no water.
a) No or insufficient water supply to the pump
or air in the system.
Check that the inlet pressure during operation is at least
1 bar. If so, the water supply is OK. Stop and vent the
system. Restart the system as described in section
6.3 BMSX system. If the pump is defective, dismantle
and repair/replace it.
b) The inlet parts are blocked. Pull the pump out of the sleeve and clean the inlet parts.
4. The pump runs at
reduced capacity (flow
and pressure).
a) The valves on the discharge side are partly
closed or blocked. Check the valves.
b) The discharge pipe is partly blocked by
impurities.
Measure the discharge pressure and compare the value
with the calculated data. Clean or replace the discharge
pipe.
c) The pump is partly blocked by impurities. Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace defective parts.
d) The pump is defective. Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace defective parts.

English (GB)
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10.3 Pressure exchanger
Warning
Before starting work on the product, switch off
the power supply. Make sure that the power
supply cannot be accidentally switched on.
Fault Possible cause Remedy
1. Excessive sound
pressure level.
a) The pressure exchanger operates above the
rated flow rates on the low-pressure side,
high-pressure side or both.
Immediately reduce the flow rate by adjusting the BM hp
pump and control valve (13). Balance the system as
described in section 6.3 BMSX system.
To increase the system capacity, add pressure
exchanger pump(s) in parallel to the existing pumps.
b) The pressure exchanger pump operates with
little or no backpressure.
Increase the backpressure by adjusting the concentrate
valve.
Balance the system as described in section 6.3 BMSX
system.
c) Air in the system. Vent the system.
2. Excessively high
recovery in the SWRO
system.
a) The BMS hs pump is operating at a flow rate
that is too high.
Check that the main BMS hs flow rate does not exceed
the membrane array production capacity for a given
temperature, salinity and fouling factor.
b) Increased salinity or raw-water temperature. Adjust flow rates in the system. See section 7.3 BMSX
system.
3. High salinity in the
high-pressure seawater
feed stream.
a) Unbalanced system. See section 6.3 BMSX system.
b) A jammed or stalled rotor short-circuits the
high-pressure concentrate with the high-
pressure feed water. No exchange occurs;
no audible rotation.
See fault number 5.
4. The low-pressure flow
is lower than the high-
pressure flow which
entails mixing and high
feed-water salinity.
a) Operating pressure exchanger pumps below
the rated flow rate results in low rotor
rotation and increased mixing.
Increase and balance the flows through the pressure
exchanger pump. Do not exceed the recommended
maximum flow rates. To increase the system capacity,
add pressure exchanger pump(s) in parallel to the
existing pumps. See section 6.3 BMSX system.
b) Malfunctioning and/or stalled BM hp pump. Check the rotation, operation, flow rates and pressures
of the BM hp pump.
5. Stalled rotor (no
audible rotation).
a) The system operates above the rated
pressure or below the rated flow capacity. See section 6.3 BMSX system.
b) Debris or foreign particles in the device. Contact Grundfos Service Department.
c) The system is not properly flow-balanced. See section 6.3 BMSX system.
6. Low concentrate flow. a) Excessive pressure losses through the
SWRO system. Contact Grundfos.
b) Malfunctioning and/or stalled BM hp pump. Check the operation, flow rates and pressures of the BM
hp pump.