Corroban 41 closed system corrosion inhibitor
25KG drum (Liquid chemical)
- Synergised nitrite based inhibitor
- Low dosage rate
- Highly cost effective
- Excellent protection
- Protects steel, cast iron, copper & brass
- Not recommended for aluminium
- Suitable for chilled water, LTHW and MTHW systems
CORROBAN 41 is a closed system corrosion inhibitor based on sodium nitrite synergized with a blend of organic corrosion inhibitors intended to protect steel, copper and other non-ferrous metals (excluding aluminium). As such CORROBAN 41 is the ideal treatment for closed systems such as chilled water, LTHW and MTHW systems.
Corroban 41 is an extremely strong passivator of exposed or corroded metal surfaces.
When compared with more traditional nitrite-borate based corrosion inhibitors CORROBAN 41 offers the benefit of a lower dosage rate and a much reduced increase in system water TDS.
CORROBAN 41 is NOT intended for use in systems containing Aluminium or galvanised pipework.
1 – 2 litres / 1000 litres of system water and make-up
Normal treated water control limits
pH 8.5 – 10.5
Nitrite: 200mg/l min.
TDS: 2000mg/l max.
TVC: 103 cfu/ml max.
How to use it
Corroban 41 should be added to the system at an initial dosage rate of 2 litres / 1000 litres of system water content. This will passivate metal and should establish the required minimum Nitrite reserve of 200mg/l. Whenever the system is drained or loses a significant quantity of water then the additional Corroban 41 should be added at the rate of 1 – 2 litres / 1000 litres.
The active inhibitor reserve can be measured using a simple nitrite closed system testkit.
In order to control potentially problematic microbial contamination it is recommended for chilled water and LTHW applications that the system is also dosed initially with Biocide ITA at the rate of 200 – 500ml / 1000 litres and that is repeated once every 3 months. The microbial activity (TVC) in the system can be monitored using microbial dipslides.
It is generally recommended that new closed systems are pre-commission cleaned prior to adding a corrosion inhibitor – our product Corrosperse 84 is ideal for this and can also be used to restore heat transfer and flow to older systems.
Chemical addition is made easier using a chemical dosing pot.