Addenbrooke’s Hospital

Official Scientific Report of NMR PIPETECTOR Installation Anti-Corrosion Equipment at Addenbrooke’s Hospital


  • Addenbrooke’s Hospital Appearance of the building
  • Addenbrooke’s Hospital Outlet pipe from the hot water tank

Installation Purpose and Result

Addenbrooke’s Hospital is one of the largest hospitals in England that has more than 1,000 beds administrated by Cambridge University Hospital’s NHS Foundation Trust. In 1976, the hospital was moved to its present property in the southern area of Cambridge City.

The hospital’s engineering group was troubled by corrosion issues in the domestic hot water system which covers Building C and D. In 2001, the engineers decided to replace the outlet pipes of hot water tanks with new steel galvanized pipes. However, corrosion issues did not stop because Fe-ion dissolved into water due to single-cell bacteria: there were frequent water leaks, and discolored water came out of faucets every morning. In 2004, to address internal corrosion, two units of NMR Pipetector were installed on the outlet pipes of hot water tanks, and one unit of NMR Pipetector was installed on the cold-feed water supply pipe on the third floor where the cold water is mixed with hot water to meet optimal temperature. Water samples were taken from a third-floor faucet in February and April 2004 and sent direct to Anglian Water Services Ltd for analysis of Fe-ion content in water.

Only 66 days after the installation, Fe-ion content decreased from 1.07 mg/l to 0.11 mg/l which indicates that chemical reaction which forms corrosion (FeO (OH)) inside the pipes stopped completely. With the continued use of NMR Pipetector, existing corrosion will be reduced to magnetite (Fe3O4), a firm coating that does not dissolve into water, and protects inner surface of piping from further corrosion.

On 16th of January 2019, 15 years since two NMR units were first introduced to the hospital, a water sample was taken from the main domestic hot water system as a follow-up examination and was sent direct to Chemtest Ltd for analysis. As it is shown in the result attached on the last page, the anti-corrosion effect of “NMR Pipetector” is still evident as the Fe-ion content is displaying amount as little as 0.18 mg/l. This confirms that NMR technology is still providing complete protection against internal corrosion even 15 years after the installation.

Installation Summary

Name and Location of Building Addenbrooke’s Hospital: Hills Road, Cambridge, England
Building Summary 43 years old 5-story hospital facility with over 1,000 beds
Installation Day February 16, 2004
Installation Place and Amount

Outlet pipes from 2 hot water tanks: PT-75DS × 2 units

Cold water branch pipe on the third floor: PT-30DS × 1 unit

Change of Fe-ion Content in Hot Water

Change of Fe-ion Content in Hot Water

Fe-ion Content in Hot Water (㎎/ℓ)

Before Installation After 11 Days After 66 Days After 15 Years British Government Standard for Drinking Water
1.07 0.188 0.11 0.18 0.2