UDC 628.144+620.193
DOI 10.35776/VST.2025.08.06
Chukhin Valentin, Makisha Nikolai
Factors affecting accelerated corrosion of galvanized pipes in hot water supply systems
Summary
The results of inspecting hot water supply systems of residential buildings in Moscow and other cities of Russia are summarized. The examined buildings had a wide range of hot water supply systems: single-zone and dual-zone, with the number of sections from 1 to 10, with the number of floors from 8 to 31, with risers up to 32 in number and combined into sectional units. A distinctive feature of all the buildings was the short service life of hot water supply systems (before time of rusty water and holes appearing in the pipes), amounting to 3–7 years instead of the period of 25 years provided for in CP 30.13330.2020 (clause 11.2). The causes of accelerated corrosion of galvanized pipes were identified by the degree of their effect. The determining factors causing accelerated corrosion are high oxygen concentration in raw cold water and disregard of the real protective capacity of the zinc coating while designing, installing and operating the systems. Particular attention is paid to cases where the causes of corrosion unevident. In order to clarify the effect of some factors causing accelerated corrosion, the results of additional studies are presented.
Key words
hot water supply system , corrosion , steel galvanized pipes , electrolytic potential
