Startup; Calibration; Operation; Maintenance - Grundfos DSS Installation And Operating Instructions Manual

8. Startup

Warning
Some chemicals react with water, which can lead to
explosions. If the dosing medium can react with
water, the DSS system must be flushed with a
medium compatible with both water and the dosing
medium first, to remove remaining water in the DSS
system.
Prior to startup, flush all tanks and pipes.
Caution
An initial test can be made with water if the dosing
medium is compatible with water.
The DSS system is tested for tightness in the factory.
Note
Note
Some residual water may still be present in the
fittings and pipes.
1. Retighten all threaded joints.
2. Check the tightness of the entire DSS system and all pipes.
3. Check the electrical wiring and the power supply.
4. For dosing pumps with three-phase motors, additionally check
the direction of rotation and the setting of the motor
protection.
5. Install the inlet line with foot valve in the dosing tank.
– Install the inlet line with a continuous upward slope towards
the dosing pump.
6. Open the isolating valves for the dosing pump.
7. Vent the pump.
For details on venting the dosing pump, see installation and
operating instructions for the dosing pump.
Optional procedure for venting a dosing pump via the sample
or bleed valve:
– Add a hose to the sample or bleed valve that directs the
medium to a drain or back to the dosing tank.
– Open the sample or bleed valve (13). See fig 2.
– Start the pump and continue pumping until medium flows out
of the sample or bleed valve.
– Stop the pump and close the sample or bleed valve. The
hose can either be removed or stay.
8. Check the proper interaction of all electronic signal
accessories such as leakage detection, level switch, alarm
relay, with the controller of the installation.

8.1 Calibration

Calibration must be done with the dosing medium. For details on
calibration, see installation and operating instructions of the
dosing pump.
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9. Operation

In normal operation, the DSS system operates independently.
• Do not close the isolating valves on the outlet side of the pump
during normal operation.
– Otherwise the pressure relief valve (7 or 11) will open. See
fig. 2
• Keep all isolating valves closed that are not in the line
between the dosing medium inlet and the injection point, e.g.
valve (3) of the calibration column; the inlet isolating valve (5
or 9) and outlet isolating valve (8 or 12) of the dosing pumps;
and sample or bleed valve (13). The operator decides which
pump is the duty pump and which is the standby pump. See
fig. 2.
• Do not close or block the vent hole of the dosing tank.
• Do not contaminate the dosing tank.

10. Maintenance

10.1 Safety instructions

Warning
Cleaning and maintenance must only be carried out
by authorized and qualified staff.
Wear the stipulated personal protective equipment
(protective clothing, goggles, respirator etc.) when
handling chemicals.
Observe the chemicals manufacturer's safety data
sheets and safety instructions of the chemicals used.
Warning
Shut down the entire installation before starting any
work on the system components and lines.
Before starting maintenance work, disconnect the
DSS system from the power supply.
Before starting maintenance work, depressurize the
outlet line.
Drain and flush dosing head, valves and pipes.
Warning
Safety devices, which have been deactivated during
maintenance, must be activated again immediately
after maintenance.
Note
Note
Store important spare parts close to the DSS system.