Novachem Condensate Control is a unique blend of liquid neutralizing amine, designed for inhibiting corrosion in condensate lines. Carbon dioxide enters the condensate system in two ways:-
(a) As a dissolved gas.
(b) As a decomposition product of soluble carbonates and bicarbonates, carbon dioxide vaporizes from the boiler and forms carbonic acid when it condenses with the condensate lowering the pH, iron and copper will enter into solution more rapidly as pH decreases causing an increase in corrosion rate. Within the condensate system and deposition of metallic oxides in the boiler Novachem Condensate Control is quickly volatilized in the boiler and travels with the stream. In this way, it is able to neutralize carbon dioxide at all points throughout the system thus avoid low Ph attack.

Feed Requirements :

The amount of Novachem Condensate Control required depends upon the total carbon dioxide entering the system as free carbon dioxide, bicarbonates and carbonates as well as the percentage of condensate returned. Theoretically, it requires eight kilos of Novachem Condensate Control to neutralize one kilo of carbon dioxide to a pH of 8.3.

Method Of Feeding :

Novachem Condensate Control may be added separately or with other water treatment chemicals to the deaerator storage section, feed water tank, feed water line or directly to the boiler. Continuous feed is the most desirable method although satisfactory results have been obtained by slug feed. Feed solutions can be made with any water supply, temperature should be below 40°C / 104°F. Feed equipment should be made of steel or alloys or iron or plastic. Brass or galvanized parts should not be used in feed systems because of the high pH of the concentrated solution.

Dosage :

In system starting to use Novachem Condensate Control for the first time the feed rate should be started at 25% of the external dosage. The dosage can be increased in 25% increments at 3- 4 week intervals. This technique will avoid sweeping excessive amounts of old corrosion products dislodged by Novachem Condensate Control back into the boiler. Novachem Condensate Control is controlled by testing return condensate for pH and maintaining this pH between 8.0 to 9.0, a pH meter, colourimetric pH test or titration is used to control feed rate.

Starting Dose :

Novachem Condensate Control needed to neutralize total alkalinity in feed water (0.0013 x total alkalinity in ppm )

Total alkalinity of feed water Novachem Condensate Control needed as ppm CaCo3 ltrs / 1000ltrs
0 – 5ppm…………… 0.007 ltrs
5 – 10ppm………….. 0.013 ltrs
10 – 15ppm………… 0.020 ltrs
15 – 20ppm………… 0.026 ltrs
20 – 25ppm………… 0.032 ltrs
25 – 30ppm………… 0.039 ltrs