Official Scientific Report of NMR PIPETECTOR Installation
Anti-Corrosion Application, Harrods
Installation Purpose and Result
Harrods Department Store is situated in Knightsbridge, London and is the Worlds most famous department store, and first opened in 1849. The domestic hot water pipe work in Harrods is approximately 25 to 30 years old and is manufactured from galvanized steel and was experiencing a problem with red rust and discoloured water within the domestic hot water supply throughout the building, which was the result of internal corrosion in the pipes. For the protection of the hot water pipe work from corrosion, one NMR unit of 6 inch (PT-150DS) was installed onto a 168mm outer diameter common hot water header pipe that is connected with two plate heat exchangers.
Only 39 days after the installation of NMR Pipetector, the Fe content in hot water decreased from 1.294mg/l (before the installation of NMR Pipetector) to 0.44mg/l, and 47 days after the installation, the Fe content decreased to 0.058mg/l, and 67 days after the installation, the Fe content decreased to 0.022mg/l which is much lower than the British Government Standard for Drinking Water of 0.2mg/l. It means that new forming of corrosion (FeO(OH)) inside of the pipework was immediately terminated, and the existing corrosion was reduced to magnetite (Fe3O4) which is not dissolved into the water and protects the inside of the pipe from corrosion.
Fe content in hot water (mg/l)
Change of Fe content in water (mg/l)