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7.3 BM hp circulation pump
6" BM hp circulation pump
2100 / 2700 mm
8" BM hp circulation pump
2400 mm
Fig. 4
6" BM hp and 8" BM hp circulation pumps
Fig. 5
Positioning the BM hp circulation pump
The solenoid valve must be positioned at the
Caution
highest point of the pump.
8. Pipe connection
8.1 Inlet and discharge pipes
A sample connection at the low-pressure discharge of the
X-Changer can be used to confirm the performance of the unit.
When the X-Changer is operating normally at balanced flow, the
salinity of the low-pressure discharge water from the X-Changer
will be approximately equal to the salinity of the reject water from
the membranes. If the X-Changer is not balanced, the salinity of
the low-pressure discharge from the unit will be low.
If a rotor is stuck, the salinity from the stuck unit will be
approximately equal to the salinity of the sea-water feed.
The BMPX units are fitted with clamp liners for Victaulic/
PJE clamp couplings HP-70 ES on the inlet and discharge sides.
Position the clamp liners as shown in fig. 6.
During initial start-up, all piping associated with the X-Changer
should be thoroughly flushed to ensure that no particles enter
and/or damage the X-Changer. Grundfos recommends
installation of a protective strainer in the flexible couplings at the
high-pressure and low-pressure inlets.
Avoid any stress in the pipe system.
Caution
6
165 mm
289 mm
Allowed
Not allowed
Pipe system
Clamp liners
Fig. 6
Position of clamp liners
9. Electrical connection
9.1 BMP hp feed pump
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. See
fig. 7. The electrical connections must be made in the terminal
box.
Warning
Before making any electrical connections, make
sure that the electricity supply has been switched
off and that it cannot be accidentally switched
on.
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.
95
A1
H1
H2
K
N
A2
98
96
S1
K1
Fig. 7
Wiring diagram, BMP hp feed pump
The required voltage quality measured at the motor terminals is
– 10 %/+ 6 % of the rated voltage during continuous operation
(including variation in the supply voltage and losses in cables).
It must be checked that there is voltage symmetry in the
electricity supply lines, i.e. approximately same difference of
voltage between the individual phases. See also section
19. Checking motor and cable, point 1.
The motor is wound for star-delta starting.
The following starting methods can be used:
•
star-delta starting
•
soft starter
•
frequency converter.
The maximum permissible run-up changeover time for star-delta
starting is 2 seconds.
A discharge pressure of 10 bar must be achieved as quickly as
possible.
BMPX system
N
L1
L2
L3
3UN2 100-0 C
T2
T1
K1
MV
M
3
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