ABS Provides, Operating Instructions Manual, Page: 20 / 32

EN
20
10. Maintenance and controls by the user
ACCEPTABLE WATER QUALITY LIMITS
pH (25°C) 6.8 – 8.4
Electrical conductivity (µS/cm) (25°C) < 800
Chloride ion (mg CI - /I) < 150
Chlorine molecular (mg Cl
2
/l) < 5
Sulphate ion (mg SO
4
-- /l) < 100
Sodium nitrate (mg NaNo
3
/I) < 100
Alkalinity (mg CaCO
3
/1) < 100
Total Hardness (mg CaCO
3
/1) < 200
Iron (mg Fe/I) < 1.0
Copper (mg Cu/I) < 1.0
Sulphide ion (S -- /I) none
Ammonium ion (mg NH
4
+ /I) < 1.0
Silica (mg SiO
2
/I) 50
Maximum particle size to pass (filtration limit) through heat exchanger (mm) 0.87
Total dissolved solids (mg/l) < 1500
Max Ethylene, Propylene glycol 50%
construction before handling.
• Always install a filter in the water inlet circuit, in order to reduce the entry of solid particles;
• Drain totally the
vessel
before doing any maintenance operations;
• Do not clean the flooded with non-suitable mechanical systems, e.g. drills or too high pressure jets;
• Do not clean with too aggressive chemical detergents and verify their compatibility with the materials of
FOR HEAT EXCHANGERS WITH ANODES AND ANTI-CORROSION TREATMENT: IF AT
THE FIRST INSPECTION THERE IS AN EXCESSIVE CONSUPTION OF THE ANODES, IT
MEANS THAT THE ENVIRONMENT IS HIGHLY AGGRESSIVE SO IT IS NECESSARY TO
FORMULATE A “MAINTENANCE TIMETABLE” ACCORDING TO THE AGGRESSIVNESS
OF THE WATER (IT IS NOT POSSIBLE TO SUPPLY A “STANDARD” MAINTENANCE
SCHEDULE SINCE THE ANODE CONSU
M
PTION IS SUBJECT TO MANY FACTORS).
FILL COMPLETELY WITH WATER OR DRAIN TOTALLY THE
VESSEL
IN CASE OF
LONG NON-WORKING PERIODS.