The Yaesu Guchi Kaikan hall was constructed 49 years ago, using galvanized steel for its air-conditioning heating plus chilled water pipework*. The pipe was corroded with red rust inside, so the hall adopted the anti-corrosion pipe renewal device Pipetector, which cost 1/10 compared with the whole pipe replacement.
*It is a type of air-conditioning system that handles both heating and chilled water in a single pipeline that switches the water, depending on season and outer temperature. It is pretty common in large facilities in Japan where building size is limited.
When the building sampled the water from the pipeline and tested it before installing Pipetector, the result revealed that the internal corrosion was progressing seriously as the watercolor was muddy yellow, and the iron content was 11.0 mg/ℓ.
When the facility tested the water a week after the installation in the same conditions as before, it saw an improvement in the watercolor. The iron level was also reduced to less than 0.1 mg/ℓ, which is below the detection limit of water testing.
The above results are evidence that Pipetector completely stopped the development of corrosion inside the tubing and turned the corrosion to magnetite that does not dissolve in water.
Furthermore, the hall additionally installed Pipetector on its chilled water pipe after two months and also confirmed the effectiveness of the device. For details refer to the following test report below.
|Name and Location
|Yaesu Guchi Kaikan hall – Chuo-ku, Tokyo, Japan
|A 49-year-old facility with 13 stories; three basement floors and ten floors above ground
|June 19 and August 25, 2015
|Galvanized steel 200-mm air-conditioning heating plus chilled water pipework, PT-200DS × 1
Galvanized steel 150-mm chilled water pipework, PT-150DS × 2
Change in the iron content in water
May 25, 2015
|After a week
June 26, 2015
|After 2 weeks
July 3, 2015
|The standard for air-conditioning water quality
|Less than 0.1
|Less than 0.1