[Verification Results] Christ's College, University of Cambridge

Red rust is reduced to a strong passive black rust! A proven case of protection and prolongation of pipes.

The university's air conditioning hot water piping has been plagued by issues related to internal red rust, and although a sacrificial anode was introduced in 2008 as a countermeasure, the progression of red rust did not stop. Additionally, a rust inhibitor was administered once a year, but there was no change in the iron content in the water before and after the use of the rust inhibitor, raising concerns about its effects on human health. Therefore, in order to remove red rust and single-celled bacteria while maintaining the strength of the piping, an "NMR Pipe Protector PT-75DS" was installed in the air conditioning hot water piping (return pipe) of the Todd Building on campus. The iron content in the water, which was 43.81 mg/l before installation, decreased to 17.95 mg/l three weeks after installation. [Challenges] ■ Although a sacrificial anode was introduced, the progression of red rust did not stop. ■ A rust inhibitor was administered once a year, but there was no change in the iron content in the water before and after its use, and there were concerns about its effects on human health. *For more details, please refer to the PDF document or feel free to contact us.

basic information

【Effects After Installation】 - The iron concentration in the water, which was 43.81 mg/l before installation, decreased to 17.95 mg/l three weeks after installation. - After 52 weeks, it further decreased to 0.5195 mg/l, approximately one-eighty of the original value. - The red rust that had formed inside the pipes was reduced to a stable passive black rust. - The formation of an oxidized coating of black rust protected the interior of the pipes from red rust corrosion. *For more details, please refer to the PDF document or feel free to contact us.