Oil, gas and water pipelines, above ground storage tanks, power plants, energy facilities, deep wells, steel-in-concrete structures and other infrastructure assets may be subject to electrical interference caused by various third party sources. Sources of AC and DC interference include other cathodic protection systems, DC railway systems, overhead power lines and industrial operations.
Interference can cause serious damage to structural assets. Careful AC and DC interference evaluation and mitigation can prevent accelerated corrosion and avoid safety hazards.
CORPS has the experienced personnel and equipment to provide:
1. Careful analysis of AC/DC interference
2. Analysis of the effect of interference on the structure
3. Determination of the cause of the interference
4. Recommendations for mitigation of the interference
Qualified CORPS technical personnel can conduct AC and DC interference testing in the field for oil, gas and water pipelines, above ground storage tanks, power plants, energy facilities, deep wells, steel-in-concrete structures and other infrastructure assets.
CORPS Provides services and data analysis for Close interval potential logging survey for pipeline integrity.
CORPS Provides services and data analysis for Direct Current Voltage Gradient (DCVG) Survey for pipeline coating condition integrity.
Improving Safety by Reducing the Impact of External Corrosion on Pipelines
External Corrosion Direct Assessment (ECDA) is a structured process that improves safety by assessing and reducing the impact of external corrosion on pipeline integrity. ECDAs proactively prevent corrosion defects from growing to a size that would ultimately impact a pipeline’s structural integrity by:
Identifying and addressing corrosion activity, Repairing corrosion defects, Remediating the causes of corrosion
ECDA is a continuous improvement process. Through regular assessments, pipeline operators can identify and address locations where corrosion has occurred, is occurring or may occur. The external direct assessment of a pipeline involves four phases:
External Corrosion Direct Assessment: 4 Phases
In the pre-assessment phase, a detailed right-of-way (ROW) inspection is conducted and all pipeline operating data is collected.
2. Indirect inspection
The indirect testing phase includes two or more of the following testing methods:
Close interval surveys (CIS)
Direct and alternating current voltage gradient surveys (DCVG/ACVG)
Pipeline current mapping (PCM)
3. Direct examination
After the data from the indirect assessment methods are analyzed and reviewed, locations for direct examination are targeted for review and inspection of:
Pipeline coating condition
Cathodic protection system condition
Pipeline corrosion damage
Soil characteristics such as resistivity and pH at pipeline depth
4. Post assessment
Upon completion of the direct examinations, a post assessment report provides:
Details of all tests conducted
All recommendations necessary for pipeline corrosion protection
Qualified CORPS technical personnel can conduct and analyse the results for all of these external corrosion direct assessment tests for oil, gas and water pipelines.
With CORPS, you benefit from:
o Experience with all types of cathodic protection systems
o Experience testing, installing and maintaining cathodic protection systems for all types of structures throughout the world
o Highly qualified professional and NACE corrosion engineers and technicians
o Team members with experience on the client side of CP projects
o Experience managing big size CP projects and corrosion departments of large utilities and pipeline companies
o CORPS’s many proprietary cathodic protection systems that are lower in cost and have longer lives than some commonly used CP systems
o CORPS’s mission is to solve your corrosion problems. We are ready to assist with your corrosion engineering and field service needs, including design, manufacturing, installation, commissioning and ongoing maintenance, as well as project management and full turnkey solutions. In addition, we offer a broad range of proprietary corrosion prevention products.
CORPS’s team of internal corrosion experts provide comprehensive solutions for internal pipeline integrity. These services cover initial corrosion assessment and testing, design and planning of mitigation programs and measurement of the efficacy of corrosion control efforts. Starting with Internal Corrosion Direct Assessment (ICDA) to identify maximum risk locations, the control of internal corrosion in pipelines is optimized by one or more of the following activities:
• Pipeline System Evaluation and Assessment
• Engineering Calculations
• ICDA process optimization
• Prediction of corrosivity
• Laboratory Analysis of Gas, Liquids and Solids
• Microbiologically Influenced Corrosion (MIC) Testing, Studies and
• Corrosion Monitoring
• NDT (Non-Destructive Testing, In-line Inspection, Ultrasonic)
• Cleaning Pig Programs
CORPS Provides services and data analysis for soil resistivity for corrosion assessment.