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7. Maintenance
Intervals for cleaning and maintenance
•
Check the connection valves at least once a year.
•
When exchanging containers, but at least once a year:
– Clean the sealing surfaces and holes of the connection
valves
– Replace the gaskets of the connection valves
•
Replace the flexible copper lines every two years.
Warning
Maintenance has to be carried out only by
authorised and qualified personnel.
Before starting cleaning and maintenance work,
switch off the entire system.
The system must be pressureless!
Danger of gas escape!
Put on the required protective equipment.
Warning
Make sure that the system cannot be started
accidentally while working at it.
Warning
Before re-starting, check the tightness.
Danger of gas escape!
7.1 Replacing the flexible lines
The flexible copper lines have to be replaced every two years.
7.1.1 Flexible copper lines for chlorine
Material
Copper
7.1.2 Flexible stainless-steel lines for ammonia and sulphur
dioxide
Material
Stainless steel
1. Depressurise the system.
– Close the container valves while the system is still running.
– Continue operating the system, until the measuring tube on
the dosing system shows no more gas flow.
– Switch off the motive water pump. See the Installation and
Operating Instructions of the gas dosing system.
2. Replace the old flexible lines by new ones.
12
Length [m]
Product No
1
96688686
2
96690366
Length [m]
Product No
1
96688690
2
96688691
7.2 Retrofitting old header lines
Old header lines have flanged connection screwings. If your
system is equipped with old header lines, these have to be
retrofitted and the old connection screwings have to be replaced
by new soldered connection screwings.
The connection screwings can be tightened with Loctite or hemp.
Mounting the connection screwings with Loctite
Note
leads to better stability.
A
1
2
1
Fig. 16 A: Flanged connection screwing (old)
B: Soldered connection screwing (new)
Pos.
Description
1
Flanged connection screwing
2
Copper line, flanged
3
Soldered connection screwing
4
Copper line, soldered
7.2.1 Assembly with Loctite
Required equipment: Loctite 273, screw tap G 1/4, brush
Warning
Observe safety instructions when handling
adhesives!
1. Warm up the joint.
2. Remove the old connection screwing (1).
3. Remove all grease from the joint.
4. Remove adhesive residues from the internal thread with
screw tap G 1/4.
5. Apply Loctite to the thread of the connection screwing (3).
The thread must be fully wetted.
6. Screw in the connection screwing.
7. Let the joint harden for 24 hours.
7.2.2 Assembly with hemp
Required equipment: Hemp, screw tap G 1/4, brush
1. Warm up the joint.
2. Remove the old connection screwing (1).
3. Remove all grease from the joint.
4. Remove adhesive residues from the internal thread with
screw tap G 1/4.
5. Seal the connection screwing properly with hemp and screw
in.
3
B
4
3
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