Mains Condition Assessment by Echopulse, a Validation of Results☆

Abstract The total length of the drinking water distribution network in the Netherlands is approximately 117,000 kilometers. The total replacement value is estimated at 20,000 to 30,000 million Euro. Several methods are available to obtain information to determine which mains should be replaced and when. Recently the echopulse technique was introduced in the Netherlands. The echopulse results were compared to phenolphthalein staining tests and radar. The validation of results reported here shows that the echopulse method provides reliable results for AC mains. However, a prerequisite for reliable results is the availability of reliable data on the properties of the mains, especially the initial wall thickness and the Young's modulus.