To prevent pipe rust, the famous C University library has introduced NMR pipe protectors.

The red rust prevention device "NMR Pipe Protector" is simply installed on the outside of the air conditioning chilled and hot water pipes, converting red rust to black rust throughout the entire piping system for long-term durability.

In the year 2000, 13 years after its completion, C University Library discovered that there was water leakage due to red rust deterioration in part of the chilled and hot water piping of the library's air conditioning system. The circulating water was mixed with red rust, and the deterioration of the piping had progressed significantly. As a rust prevention measure within the piping, rust inhibitors were regularly administered, but the red rust deterioration did not stop, and since 1996 (9 years after construction), partial updates of the piping had been underway. However, due to the presence of asbestos in the ceiling of the library, it was difficult to carry out renewal work on the main and branch pipes. Therefore, the installation of the rust prevention device "NMR Pipe Protector" was introduced. The NMR Pipe Protector stops the red rust deterioration of the piping and can extend the life of the piping until the building's lifespan, making the removal of asbestos unnecessary and allowing for significant cost reductions. Since the installation work of the NMR Pipe Protector does not require water shutdown, construction could proceed while the building was in use, eliminating the need for the library and surrounding facilities to suspend operations. After the installation at C University Library, the rust prevention effect within the chilled and hot water piping was confirmed by the increase in the amount of black rust in the red rust. After the introduction of the NMR Pipe Protector, the piping was removed, and quantitative analysis of rust samples demonstrated the transformation of red rust to black rust.

Renovation and repair methods