Bmst System; Bmsx System - Grundfos BMST Series Installation And Operating Instructions Manual

7.2 BMST system

This procedure describes how to shut down the BMST system.
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16
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.
To flush the thrust bearing of the BMS hs pump,
Caution
start the pump for 30 seconds to allow the fresh
water to enter into the thrust bearing.
If the flushing takes more than 10 minutes, the
flow must be reduced to maximum 10 % of the
Note
rated flow rate.
During periods of inactivity, the pump must be
Note
filled with clean fresh water.
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15

7.3 BMSX system

This procedure describes how to shut down the BMSX system.
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5 16
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26
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.
If the flushing takes more than 10 minutes, the
Note flow must be reduced to maximum 10 % of the
rated flow rate.
During periods of inactivity, the pump must be
Note
filled with clean fresh water.
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.
To flush the thrust bearing and shaft seal of the
BMS hs pump, start the pump for minimum
Caution
30 seconds to allow the fresh water to enter into
the thrust bearing housing.
1000 ppm TDS
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