Maintenance Intervals; Safety Instructions - Grundfos DSS Montage- Und Betriebsanleitung

7. 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 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 suction line with foot valve in the dosing tank.
– Install the suction line with a continuous upward slope
towards the dosing pump.
6. Make sure that the valve at the flush connection is closed.
7. Open the isolating valves for the dosing pump.
8. Vent the pump.
Procedure for venting a pump via the flush connection:
– Open the valve at the flush connection by turning it left.
– Flush liquid pressure: maximum 0.5 bar above the operating
pressure.
– Close the valve at the flush connection by turning it right.
– Disconnect the hose from the flush connection.
9. Check the proper interaction of all accessories such as
leakage detection, level switch, alarm relay, with the controller
of the installation.
10. Make sure that the valve at the flush connection is closed.
7.1 Calibration
Calibration must be done with the dosing medium. For details on
calibration, see installation and operating instructions of the
dosing pump.
8. Operation
In normal operation, the DSS system operates independently.
• Do not close the isolating valves on the discharge side of the
pump during normal operation.
– Otherwise the safety valve will open.
• Keep all isolating valves closed, that are not in the line
between the dosing medium inlet and the injection point, e.g.
valves (pos. 7, 10, 11) of standby pump (pos. 6) and drain/
flush valve (pos. 9). See fig. 1.
• Do not close or block the vent hole of the dosing tank.
• Do not contaminate the dosing tank.
9. Maintenance

9.1 Safety instructions

Warning
Cleaning and maintenance must only be carried out
by authorised 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, depressurise the
discharge 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 Store important spare parts close to the DSS system.

9.2 Maintenance intervals

9.2.1 Daily checks
• Inspect the tightness visually.
9.2.2 Regular checks
Regular checks must be carried out weekly or monthly,
depending on the type of dosing pump and dosing medium. See
the installation and operating instructions of the dosing pump and
characteristic of the dosing medium.
• Check the dosing performance.
• Check the strainer and the foot valve,
– clean the strainer, if necessary.
• Maintain the dosing pump,
– see installation and operating instructions of the dosing
pump.
• Maintain the pressure loading valve,
– see installation and operating instructions of the pressure
loading valve.
• Check all accessories such as leakage indication, level switch,
alarm relay for their proper functioning.
9.2.3 Annual checks
• Check the entire installation,
– replace gaskets, O-rings, diaphragms and other wear parts,
if necessary.
After maintenance, check the proper functioning and
Note
tightness of the entire installation.
10. Long-term shutdown
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 the dosing medium.
1. Flush the dosing tank, lines, pipes, connections and pumps.
– The flushing can be done with water if the dosing medium is
compatible with water.
– In case of danger of frost, remove remaining liquid from
tanks, lines and connections with compressed air.
2. Disconnect the DSS system from the power supply.
11. Disposal
This product or parts of it must be disposed of in an
environmentally sound way. Use appropriate waste collection
services. If this is not possible, contact the nearest Grundfos
company or service workshop.
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