Water Technologies & Solutions fact sheet

CorTrol* IS3000E

inorganic oxygen scavenger

Controls preboiler and boiler oxygen corrosion.
Reacts rapidly.
Improves boiler reliability.
Easy to handle liquid product.

description and use

CorTrol IS3000E is a catalysed sodium bisulphite based inorganic oxygen scavenger which is highly effective at scavenging dissolved oxygen, especially at low feedwater temperatures.

CorTrol IS3000E is very cost effective, simple to feed, easy to monitor and is most appropriate for boiler systems with softened make up water.

CorTrol IS3000E should be fed to the storage section of a deaerator, hot well or feedwater tank.

All the ingredients in CorTrol IS3000E are listed in FDA 21CFR173.310 – boiler water additives for use in the preparation of steam that will contact with food.

For systems operating at pressures that are greater than 63 kg/cm² (900 psig) or for systems, which use boiler feedwater for steam desuperheating or attemporation consult your VEOLIA representative.

typical applications

Oxygen corrosion, “pitting”, is most often seen in the feedwater circuit, economiser and condensate system. Oxygen pitting can lead to leakage and equipment failure in a relatively short period of time.

In the feedwater train, the deaerator is the focal point for oxygen removal. Efficient mechanical deaeration reduces the dissolved oxygen to very low levels.

However, the small quantities of dissolved oxygen that remains after deaeration may induce oxygen corrosion.

Oxygen corrosion also frequently occurs during start up and shutdown and while the boiler system is on stand by or in storage. This is caused by oxygen in leakage and as a result of a large amount of cold water contacting the unit for a relatively short period.

CorTrol IS3000E contains a catalyst to accelerate its reaction with oxygen, as shown in the following reaction:

2Na2SO3 + O2  Na2SO4

The rapid reaction rate provided by the catalyst is obtained over commonly encountered boiler feedwater pH levels. The optimum boiler feedwater pH for the oxygen scavenger action is 8.0 to 9.0.

Catalysed sodium bisulphite is the chemical treatment most commonly used to control oxygen corrosion in boiler systems operating below 63 kg/cm² (900 psig). It can also be used under well-defined conditions in higher-pressure systems.

CorTrol IS3000E is used because it:

Reacts rapidly with dissolved oxygen.
Is easy to apply and control.
Provides good system protection.

When applied to the preboiler or boiler system, CorTrol IS3000E protects metal surfaces from oxygen attack.

treatment and feeding requirements

Feed point – CorTrol IS3000E should be fed to the deaerator storage section, hot well or feedwater tank if no attemporation water is used. Check with your local

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VEOLIA representative to determine the specific conditions in your system in order to define the optimum dosing point.

Feed rate – The feed rate is based on the residual dissolved oxygen level in the deaerated water, the cycles and the desired sulphite residual in the boiler water. Feed continuously.

general properties

The physical properties of CorTrol IS3000E are shown on the Safety Data Sheet, a copy of which is available on request.

packaging information

CorTrol IS3000E is a liquid blend and is available in a wide variety of customised containers and delivery methods. Contact your local VEOLIA representative for further details.