Bmet; Operation Settings; Liquid Filling, Venting And Checking Of Direction Of Rotation; Checking Of Operation - Grundfos BME Montage- Und Betriebsanleitung

8.2 BMET

Sound pressure level: Up to 105 dB(A)
Warning
The sound pressure level is so high that hearing
protection must be used.
To start up a BMET booster module, proceed as follows:
1. Start the feed pump and check that the inlet pressure of the
booster module is higher than 2.0 bar (20 metres head) and
lower than 5.0 bar (50 metres head).
2. Vent the booster module. See section
and checking of direction of
The module is fully vented when liquid runs out of the air
escape valve.
3. Start the high-pressure pump.
Check that the oil level in the oil container stabilises between
minimum and maximum.
4. Check the direction of rotation as described in section
9. Liquid filling, venting and checking of direction of
5. Set the discharge pressure of the booster module to the
desired value.
6. Check that the inlet pressure of the booster module is higher
than 2.0 bar (20 metres head) and lower than 5.0 bar (50
metres head).
The booster module is now ready for operation.
Air escape valve
High-pressure pump
Turbine pump
Low-pressure
switch
Feed pump
Raw-water
supply
Fig. 12 BMET booster system

8.3 Operation settings

The flow and discharge pressure of the booster module should
always be kept within the ranges for which it was originally
designed. See "Technical specification" supplied with the system.
If the system requires flows and pressures outside the design
range, changes are possible. Please contact Grundfos.
9. Liquid filling, venting
rotation.
rotation.
High-pressure switch
RO filter
Permeate
Turbine
Concentrate
(brine)
9. Liquid filling, venting and checking of
direction of rotation
Procedure:
1. Open the valve on the inlet side of the module. The module is
normally primed by the pressure from the feed pump.
2. Open the air escape valve on the discharge side of the
module.
3. Continue the filling procedure until water runs out of the air
escape valve. See figures 11
4. If the system is fitted with an isolating valve on the discharge
side of the high-pressure pump, open this valve approx. 1/4.
5. Start the module (for 1 sec. only) and check the direction of
rotation. The correct direction of rotation is indicated on the
cover of the V-belt screen. If necessary, interchange two
phases to the motor.
The direction of rotation of the turbine-driven pump is always
correct.

10. Checking of operation

Check the following at suitable intervals:
• Flow and pressure.
• Current consumption.
• Lubricating oil level.
• Whether the oil container contains water (the lubricating oil
should be changed every 2,000 operating hours or every 6
months, whichever comes first).
• Whether the motor ball bearings are being greased (check that
excessive grease can escape through the drain hole in
bearing cover).
• Whether the bearings are worn.
• Whether the V-belts are tightened correctly.
Check every 6 months. See section
• Whether the shaft seal is leaky.
The drain hole underneath the pulley must be free from
deposits. Flush with clean fresh water, if required.
The shaft seal is lubricated by the pumped liquid. Small
quantities of liquid are therefore drained via the drain hole.
• Whether the noise level has changed.
We recommend that you write the operating data into the log
book supplied with the system. These data can be useful for
maintenance purpose.
and 12.
13. V-belt tension.
9