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 sample of the circulating air conditioning chilled and hot water was taken from the hotel’s piping, revealing that the water was brown due to red rust in the pipes, with a total iron concentration of 28 mg/l, indicating severe red rust corrosion within the piping. Two weeks after the installation of the NMR Pipe Protector, a water sample taken under the same conditions showed that the water color had become slightly transparent, and the total iron concentration had significantly decreased to 4.0 mg/l. A water sample taken six weeks after installation showed that the water color had become almost transparent, with the total iron concentration further reduced to 1.6 mg/l, proving 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 costs 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.
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