6
7.3 BM hp circulation pump
Fig. 4
6" BM hp and 8" BM hp circulation pumps
Fig. 5
Positioning the BM hp circulation 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.
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.
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
, 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.
T
M
02
95
7
2
33
0
4
TM
01
12
82
41
97
Caution
The solenoid valve must be positioned at the
highest point of the pump.
Caution
Avoid any stress in the pipe system.
2400 mm
200 mm
ø273
289 mm
ø168.3
ø168.3
2100 / 2700 mm
165 mm
ø88
8" BM hp circulation pump
6" BM hp circulation pump
Allowed
Not allowed
T
M
01
10
66
35
97
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.
TM
02
59
75
45
02
Pipe system
Clamp liners
BMPX system
MV
98
96
A2
T2
T1
K1
S1
K
H2
95
A1
H1
3UN2 100-0 C
N
3
M
K1
N
L3
L2
L1
