Leakage prevention measures for the air conditioning piping at Hotel #M.

Case study of the introduction of NMR pipe protectors into hotel water supply piping.

At Hotel #M, 21 years after its construction, the galvanized steel pipes (SGP) for the air conditioning chilled and hot water system were experiencing significant red rust deterioration, with a risk of leakage at the pipe joints. Therefore, a red rust prevention pipe longevity device called the "NMR Pipe Protector" was installed. Before the installation of the NMR Pipe Protector, a water sample was taken from the circulating air conditioning chilled and hot water within the hotel’s piping. The water was brown in color due to red rust inside the pipes, and the total iron content in the water was found to be 28 mg/l, indicating severe red rust corrosion within the pipes. Two weeks after the installation of the NMR Pipe Protector, another water sample was taken under the same conditions, and the water color had become slightly transparent, with the total iron content reduced significantly to 4.0 mg/l. Six weeks after installation, the water sample showed that the water was almost transparent, and the total iron content further decreased to 1.6 mg/l. It was proven that the progression of red rust within the pipes had completely stopped, and the existing red rust had transformed into an inert black rust that does not dissolve in water, with a volume reduced to one-tenth. At Hotel #M, it has been verified that if the use of the NMR Pipe Protector continues, all red rust in the air conditioning chilled and hot water pipes will change to black rust, and the cost will be less than one-fifth of the pipe replacement work, allowing the pipes to be extended for the lifespan of the building. Naturally, leakage has been completely prevented thereafter.

Water Treatment