Analiza korozijskog mehanizma u čeličnim vodovodnim cijevima s neizoliranom unutrašnjom stijenkom

master's thesis

• Title (english): Analysis of the corrosion mechanism in steel water pipelines with non-insulated inner wall
• Author: Sara Hriberski
• Mentor: Sanja Martinez (mentor)
• Committee member: Sanja Martinez (predsjednik povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-02-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Ovaj diplomski rad istražuje kompleksnu tematiku korozije vodoopskrbnih sustava, ključnog dijela urbane infrastrukture zaduženog za osiguranje sigurne opskrbe pitkom vodom. Očuvanje strukturalnog integriteta vodovodnih cijevi, posebice onih s neizoliranim unutarnjim stijenkama, predstavlja ključnu brigu kako bi se održala pouzdana opskrba vodom i spriječili štetni učinci unutarnje korozije. Važno je naglasiti da svaki sustav opskrbe vodom predstavlja jedinstveno okružje koje oblikuje nijanse procesa korozije. U ovom slučaju, fokus je na čeličnoj cijevi za vodu iz priobalnog područja sjeverne Hrvatske. Izgled cijevi otkriva uočljive znakove propadanja, uključujući vidljive promjene u profilu debljine na određenim mjestima, promjene u boji i prisutnost različitih naslaga. Nadalje, uočava se i ljuštenje heterogenog sloja korozijskih produkata cijevi, pridodajući kompleksnosti proučavanog fenomena. Višeslojno istraživanje opaženog korozijskog fenomena uključilo je niz analitičkih tehnika,
od infracrvene spektroskopije s Fourierovom transformacijom (FTIR), digitalne mikroskopije, skenirajuće elektronske mikroskopije (SEM), do energijski disperzivne rendgenske spektroskopije (EDS). Dodatno, provedeno je i ispitivanje na prisutnost sulfida/karbonata s indikatorskom trakicom od olovnog acetatata i određivanje indeksa kvalitete vode te putem Langelierovog indeksa zasićenja (LSI). Istraživanje svojim rezultatima pridonosi razumijevanju specifičnosti korozijskih oštećenja u vodovodima i parametara okoliša u kojem ta oštećenja nastaju. Razumijevanje uzroka u mehanizama unutrašnje korozije od vitalnog je značaja za pravilno upravljanje vodovodnim sustavima i produženje vijeka trajanja cijevi.

Abstract (english)

This graduate thesis investigates the complex topic of corrosion of water supply systems, which are a key part of urban infrastructure responsible for ensuring a safe supply of drinking water. Preserving the structural integrity of water pipes, especially those with uninsulated inner walls, is a key concern in order to maintain a reliable water supply and prevent the harmful effects of internal corrosion. It is important to emphasize that each water supply system represents a unique environment that shapes the nuances of the corrosion process. In this case, the focus is on a steel water pipe from the coastal area of northern Croatia. The appearance of the pipe reveals noticeable signs of deterioration, including visible changes in the thickness profile in certain places, changes in color and the presence of various deposits. Furthermore, the peeling of a heterogeneous layer of pipe corrosion products is observed, adding to the complexity of the studied phenomenon.
The multi-layered investigation of the observed corrosion damage included a number of analytical techniques, from Fourier-transform-infrared spectroscopy (FTIR), digital microscopy, and scanning electron microscopy (SEM), to energy-dispersive X-ray spectroscopy (EDS). In addition, a test for the presence of sulphides/carbonates was carried out with lead acetate indicator paper and the determination of the water quality index using the Langelier saturation index (LSI). With its results, the research contributes to the understanding of the specifics of corrosion damages in water pipes and the parameters of the environment in which these damages occur. Understanding the causes of internal corrosion mechanisms is vital to properly manage and extend the life of water-transporting pipeline systems.

• Keywords: unutarnja korozija; vodovod; očuvanje integriteta
• Keywords (english): internal corrosion; pipeline; preservation of integrity
• Language: croatian
• URN:NBN: urn:nbn:hr:149:728534
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka ekoinženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-02-29 10:57:21