General Description; Commissioning; Pumped Liquids; Technical Data - Grundfos BMEX Series Montage- Und Betriebsanleitung

2. General description

The Grundfos BMEX booster system is designed for desalination
of sea water in reverse osmosis systems, so-called SWRO
systems (SWRO = Sea Water Reverse Osmosis). The design of
the system offers high energy recovery.
The BMEX booster system consists of:
• BME hp feed pump (hp = high-pressure)
• BM hp circulation pump (hp = high-pressure)
with Variable-Frequency Drive (VFD)
(the pump is installed in a sleeve)
• X-Changer module.
The BMEX units are supplied from factory in boxes in which they
must remain until they are to be installed. The units are ready for
installation.

2.1 Commissioning

Commissioning of the BMEX booster system must be carried out
by competent and certified Grundfos employees to ensure long
and trouble-free operation.
If this requirement is not met, the BMEX warranty will
Note
be invalidated.
The commissioning includes training on site of the people
maintaining and monitoring the system.

2.2 Pumped liquids

Thin, non-explosive liquids, not containing solid particles or
fibres. The liquid must not chemically attack the materials of the
BMEX units. In case of doubt, contact Grundfos.
Warning
The BMEX booster system is designed solely for
brackish water and sea water and must not be used
for other liquids.
The raw water to the X-Changer module must be filtered to
maximum 5 microns abs and the raw water to the BME hp feed
pump to maximum 30 microns abs.
The BMEX system must never operate with water/liquid
containing substances removing surface tension, e.g. soap. If this
type of detergent is used for cleaning the system, the water/liquid
must be led around the units via a bypass.
During transportation and storage, the pumps must
Caution
never be preserved with liquids which are aggressive
to the pump materials.
Fig. 1 BMEX booster system

3. Technical data

See motor and pump nameplates.
3.1 Sound pressure level, inlet pressure and
temperatures
Sound
BMEX
pressure
system
level
BME hp feed
85 dB(A)
pump
BM hp
circulation
70 dB(A)
pump with
VFD
pressure
76-91
X-Changer
dB(A)
2/7 bar
* If the ambient temperature is higher than the values stated,
please contact Grundfos.

4. Preparation

Before installation, the following checks should be made:
1. Check for transport damages
Make sure that the BMEX units have not been damaged
during transportation.
2. Type of system
Check that the type designation corresponds to order.
See nameplates.
3. Power supply
The motor and VFD voltage and frequency details given on
the nameplate should be compared with the actual power
supply available.
4. X-Changer module
Check that all nuts are tightened.
5. V-belt
Check that the V-belt has been tightened.
See section 14. V-belt tension.
6. Lubrication
See section 18. Motor bearings, BME hp feed
7. Oil level
Check the oil level.
See section 7.1.5 Monitoring of oil lubrication
Note: During periods of inactivity, the oil container may be
empty. Check the oil level after 5 minutes of operation.
Max. liquid/
Min./max. inlet
ambient
pressure
temperature*
1/35 bar 40/40 °C
1/80 bar 40/40 °C
Low High
pressure
45/40 °C
(LP) (HP)
80 bar
pump.
system.
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