Bmsx System - Grundfos BMST Series Installation And Operating Instructions Manual

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.
Make sure that the BMS hs pump is protected by
Caution
a low-pressure switch or flow switch.
Ensure a ramp-up time of 0-1700 rpm within
Caution
3 seconds.

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.
8
6
7
14
15
12
17
16
5
4
3
2
1
26
Fig. 23 Example of BMSX booster system
Pos. Description
1 Raw-water feed pump
2 Filter
3 Low-pressure switch
4 Flowmeter
5 Pressure gauge (raw water)
6 BMS hs pump
7 Non-return valve
8 Pressure gauge (BMS hs discharge pressure)
9 Air vent
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
18
19
13
21
20
22
23
24
25
13