Stray Current Corrosion Due to Utility Cathodic Protection

The conditions in which stray currents contribute to the corrosion damage of highway structures, the tests to determine if these conditions exist, and the methods recommended to alleviate either the conditions or the damage caused by stray current corrosion are investigated. An extensive review of the literature concerning the fundamentals of stray current corrosion and the practices of utility cathodic protection is presented, including a comprehensive study of the history of stray current corrosion, from its conception with the direct current trolley systems of the late 1880's to its present day problems in the cathodic protection industry. Federal, state, and Kansas Department of Transportation rules and policy are reviewed as they pertain to utility cathodic protection and the damage it may cause to adjacent underground highway structures. Based on the research covered within this report, procedural changes for the prevention of stray current corrosion damage to highway structures and additions to the KDOT Utility Accommodation Policy (1994) are recommended. The research herein concludes that: (1) that all construction close to cathodically protected utilities should be reported to the utility owners so that stray current interference can be assessed, (2) any utility pipeline found uncovered should be reported to its owner so that it can be inspected for corrosion damage, and (3) no underground highway structure should be located within the area of influence of a cathodic protection groundbed. Additionally, its recommended that the KDOT Utility Accommodation Policy (1994) be modified to: (I) directly state the policy on stray current interference from utility cathodic protection systems, (2) require utilities installing cathodic protection systems to submit the design plans as part of the process necessary to obtain a permit agreement for operating in a highway right-of-way, and (3) state that KDOT may require additional inspections along pipelines where interference could jeopardize the structural integrity of an underground highway structure

A review of techniques for the monitoring of cathodic shielding and corrosion under disbonded coatings

The mitigation of external corrosion of energy pipelines by a combination of barrier coatings and Cathodic Protection (CP) is not always effective. Even when design specifications are properly met, the shielding of cathodic protection current from reaching steel surface by disbonded barrier coatings, often referred to as cathodic shielding, may lead to severe corrosion problems such as deep pitting, high and near neutral pH Stress Corrosion Cracking (SCC) and Microbiologically Induced Corrosion (MIC). Unfortunately, current indirect assessment methods used in the pipeline industry have serious difficulties in detecting such corrosion problems. This paper provides a brief review of current techniques and their limitations when being applied under complex buried pipeline environmental conditions. The main purpose is to identify potential methods that could be utilised in the design of new monitoring probes specific for the monitoring of cathodic shielding and corrosion of disbonded coatings in the pipeline industry

Cathodic Protection Power Supply Implementations Using Solar Photovoltaic System

Corrosion is a major problem for oil and gas operators as the cost consumed each year is fighting corrosion are staggeringly high. Along with the implementation of cost effective corrosion prevention methods, the race for reducing cost consumption still goes on. One of the common method used to prevent the corrosion is by implementing a cathodic protection system to control the environment of the protected object. It is controlled by an injected current which coming from a power supply. Common power supply is from transformer rectifier unit which get supply from Tenaga Nasional Berhad. An unexpected event such as lightning strike the power supply system may have chances to be interrupted. Interrupted by mean the earth leakage circuit breaker disconnect from the supply to the transformer rectifier unit. Once it being interrupted, the metal failed to be protected. Thus, corrosion can be occurred and lead to severe damage. The metal subjected to this project is the underground gas pipeline. This project propose a backup power supply by using solar photovoltaic (PV) system to have a continuous cathodic protection system

Galvanic corrosion and cathodic protection, selective bibliography

Selective bibliography with abstracts on galvanic corrosion and cathodic protectio

Guidelines and Methods for Conducting Porperty Transfer Site Histories

HWRIC Project 90-077NTIS PB91-10508

A Corrosion Control Manual for Rail Rapid Transit

This manual addresses corrosion problems in the design, contruction, and maintenance of rapid transit systems. Design and maintenance solutions are provided for each problem covered. The scope encompasses all facilities of urban rapid transit systems: structures and tracks, platforms and stations, power and signals, and cars. The types of corrosion and their causes as well as rapid transit properties are described. Corrosion control committees, and NASA, DOD, and ASTM specifications and design criteria to which reference is made in the manual are listed. A bibliography of papers and excerpts of reports is provided and a glossary of frequently used terms is included

An Introduction to Trenchless Technology Piping (+Türkçe Özet)

The first reason for the preparation of this book is to share recent developments experienced in underground infrastructure technology with readers. It is the fact that innovative methods are becoming main route in underground piping constructions, renevations and rehabilitations. The second reason is to give awareness of trenchless technology in civil engineering and environmental engineering societies and world communities as well as the Turkish community. The development of new equipment and method and increased level of equipment sophistication and capabilities are driving forces of trenchless technology. A safe and successful trenchless project depends on skills, training and experience of operators, field personal and project inspectors. This book will be of use for all parties in a trenchless project as it provides planning, design, construction, inspection and project management concepts

Water and Wastewater Pipe Nondestructive Evaluation and Health Monitoring: A Review

Civil infrastructures such as bridges, buildings, and pipelines ensure society's economic and industrial prosperity. Specifically, pipe networks assure the transportation of primary commodities such as water, oil, and natural gas. The quantitative and early detection of defects in pipes is critical in order to avoid severe consequences. As a result of high-profile accidents and economic downturn, research and development in the area of pipeline inspection has focused mainly on gas and oil pipelines. Due to the low cost of water, the development of nondestructive inspection (NDI) and structural health monitoring (SHM) technologies for fresh water mains and sewers has received the least attention. Moreover, the technical challenges associated with the practical deployment of monitoring system demand synergistic interaction across several disciplines, which may limit the transition from laboratory to real structures. This paper presents an overview of the most used NDI/SHM technologies for freshwater pipes and sewers. The challenges that said infrastructures pose with respect to oil and natural gas pipeline networks will be discussed. Finally, the methodologies that can be translated into SHM approaches are highlighted