Leakage prevention measures for the air conditioning piping at Hotel #T.
Case study of the introduction of NMR pipe protectors into hotel air conditioning piping.
At Hotel #T, when it was 29 years old, the red rust deterioration in the galvanized steel pipes (SGP) used for air conditioning chilled and hot water piping was very advanced, and leaks were occurring at the joints. Therefore, a red rust prevention piping longevity device called the "NMR Pipe Protector" was installed. Before the installation of the NMR Pipe Protector, a sample of the chilled and hot water circulating in the pipes was taken, and the color of the water was brownish due to the red rust inside the pipes, with a total iron content of 29 mg/l, indicating that the red rust corrosion in the pipes was very advanced. Two weeks after the installation of the NMR Pipe Protector, a water sample taken under the same conditions showed that the water was clear, and the total iron content had significantly decreased to 0.2 mg/l. Additionally, a water sample taken four weeks after installation under the same conditions also showed a total iron content of 0.2 mg/l, confirming that the red rust deterioration had been completely prevented, and the red rust inside the pipes had transformed into black rust, which does not dissolve in water and has a volume one-tenth that of the red rust. At Hotel #T, 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 cost of pipe replacement work, allowing the pipes to be extended for the lifespan of the building. Naturally, leaks have been completely prevented thereafter.
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