Hydraulic characteristics of ductile iron socket pipes with inner polyurethane coating

Summary

The extensive use of ductile iron socket pipes with inner polyurethane coating in Europe proves their efficiency. In Russia such pipes have been also used. Pipelines with polyurethane coating combine the properties of plastic (they do not corrode, do not have scale) and metal pipe (high strength, lifetime and ability to endure high pressure) advantages. The roughness of the inner pipe surface effects significantly the resistance coefficient value along the length, i. e. the hydraulic characteristics of the pipelines. However up to now no studies of the roughness value of foreign-made polyurethane coating have been carried out. The authors of the article have conducted these studies. Based on the measured roughness parameters of the ductile iron socket pipe inner surface (manufactured by vonRoll hydro, Switzerland) with polyurethane coating the friction coefficient along the length was calculated. To estimate the capacity of pipes with polyurethane coating the hydraulic calculation is given (compared to the domestic pressure polyethylene pipes).

Key words

ductile iron , socket cast iron pipes , polyurethane coating , hydraulic characteristics