Pitting corrosion of galvanized pipes in hot water supply systems

Andrianov, A. P.

doi:10.1051/e3sconf/202126304035

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…The results of surveys of centralized hot water supply (CHWS) systems located in residential buildings in which pipes began to fail within 2-3 years have been published in a number of studies [6,7]. Examples of abnormally high corrosion rates in galvanized pipes can be found in various studies.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Corrosion Rate in Galvanized Pipes in Centralized Hot Water Supply Systems

Makisha,

Chukhin

2023

Applied Sciences

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To counteract possible corrosion, steel pipes are coated with a protective layer of zinc with a thickness of 20 to 85 microns, depending on the requirements of regulatory documentation. It is proven that hot-deposited zinc can effectively protect steel surfaces for 20 to 120 years. However, in centralized hot water supply (CHWS) systems, the period of protective action can decrease to two to three years, with further damage to the zinc layer and the appearance of fistulas. In order to counteract adverse factors, it is necessary to take into account the operating mode and design features of the system, the properties of the coating, and the environment in which the pipes operate. In this article, the main attention is paid to the study of the behavior of zinc coating. The protective properties and corrosion rate of zinc coating in tap water were evaluated. It was established that the protective effect of zinc is effectively manifested in the ratio of the protected area to the unprotected, as SZn/SFe ≥ 9:1. The influence of iron-containing sediment, when it accumulates in the pipes of a CHWS system, on the corrosion rate of the zinc coating was studied. It was also noted that the corrosion rates of the new zinc coating and uncoated steel pipe measured in short-term tests differed slightly.

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Section: Introductionmentioning

confidence: 99%

“…It is known from the theory of corrosion processes that some ions, such as Fe 3+ , Cu 2+ , and Hg + , are depolarizers [7,20], i.e., they are able to accept electrons and recover. In the sediment layer, some of the iron is in ionic form.…”

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confidence: 99%

Determination of Corrosion Rate in Galvanized Pipes in Centralized Hot Water Supply Systems

Makisha,

Chukhin

2023

Applied Sciences

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“…In the corrosion process, zinc acts as a sacrificial anode, protecting the steel, which acts as the cathode. This material does not, therefore, require additional protective coatings [4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Water Quality Change on the Corrosion Process in Galvanized Pipes of Fire Protection Installations

et al. 2022

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The article presents the results of an investigation of water composition and quality in sprinkler installations, as well as the influence of temperature changes on the corrosion process. The physical and chemical components of the water were measured to ascertain the influence of its properties on the corrosion process in a wet pipe sprinkler system operating in significantly changing ambient temperature conditions. The article presents the results of measurements of the wall thickness of galvanized pipes and changes in the chemical composition of water occurring under the influence of variable ambient temperature. The range and variability of temperatures corresponded to the seasons of the year: spring and summer in a temperate climate. Changes in the corrosive aggressiveness of water were assessed using the Langelier saturation index (LSI), the Ryznar stability index (RSI), and the general acidity intensity index (I). The tests revealed that the tap water used demonstrated strong corrosive properties for galvanized pipes. The calculated indices showed the tendency of water to cause corrosion (−1.1 > LSI < 1.0; RSI = 7.1–12.8). The chemical parameters that significantly influenced the corrosion of galvanized pipes are chloride (Cl−), sulphate (SO42−), and bicarbonate (HCO3−) ions. An important factor contributing to the intensification of corrosion is the roughness and heterogeneity of the pipe surface.

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Localized corrosion attack on the galvanised steel pipes of the fire protection system

Košťúr,

Kouřil

2024

Koroze a Ochrana Materiálu

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Galvanised steel serves as a base material for pipelines in fire protection systems. However, this system is known for its occasional corrosion failures. The Systems with residual water and oxygen access contribute to formation of macrocells due to different aeration, which can lead to severe damage of the pipes. The aim of this work was to investigate the cause of localized corrosion on the galvanised pipes designated for the fire protection system. The results proved that the main cause of the fire protection pipe system was the residual water in the pipe. The influence of differential aeration on the corrosion of zinc and steel was studied by resistometric technique and showed no effect on the failure of material.

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Pitting corrosion of galvanized pipes in hot water supply systems

Cited by 3 publications

References 8 publications

Determination of Corrosion Rate in Galvanized Pipes in Centralized Hot Water Supply Systems

Determination of Corrosion Rate in Galvanized Pipes in Centralized Hot Water Supply Systems

The Influence of Water Quality Change on the Corrosion Process in Galvanized Pipes of Fire Protection Installations

Localized corrosion attack on the galvanised steel pipes of the fire protection system

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