Cold and hot water pipelines are vulnerable to internal and external c
orrosion and subjected to deposit accumulation because of chemical eff
ects. Determining the extent and the progress rate of these provides u
seful information about their operational life and safety. This paper
describes the evaluation of corrosion, remaining wall thickness and de
posits in pipes taken from water networks and heat plants, using tange
ntial radiography and density measurement techniques. Accuracy and lim
itations of both techniques were investigated on various pipe samples
with different diameters and wall thicknesses, in order to obtain opti
mum source-to-film distances, film densities and,call thickness/diamet
er ratios.