Published on 01-Nov-2023

Ultrasonic Testing on Tanks and Pipeline

Ultrasonic Testing on Tanks and Pipeline

Table Of Contents

  • Introduction
  • Ultrasonic Testing for Pipeline Corrosion Assessment
  • Factors Affecting Corrosion Rates
  • Corrosion Thickness Testing Using UTT
  • Conclusion
  • Key Takeaways


Ultrasonic Thickness Testing (UTT) is a pivotal non-destructive method widely used for ultrasonic testing of pipes and pipeline tanks in the oil and gas industry.

This technique enables engineers to conduct ultrasonic pipeline inspection by precisely measuring the remaining wall thickness of the pipeline.

UTT is fundamental for evaluating pipeline integrity and ensuring its longevity.

UTT involves the use of Advanced Ultrasonic Testing machines to scan both unpainted and painted surfaces of the pipeline.

It is a vital aspect of ultrasonic pipeline inspection for assessing corrosion levels and determining the extent of thinning or material loss.

  • By comparing the ultrasonic testing pipeline data with the original design thickness, engineers can accurately assess the impact of environmental conditions and the characteristics of the transported fluids on corrosion rates.

This Ultrasonic Testing of pipes is essential for understanding how factors like temperature, pressure, and the chemical composition of the fluids affect the pipeline's condition.

The alignment of actual corrosion rates with initially predicted rates is crucial for estimating the pipeline's lifespan and planning maintenance schedules.

It ensures that deviations from predictions do not result in a shorter pipeline lifespan or the need for more frequent maintenance, ultimately optimizing the safety and reliability of the pipeline infrastructure.

Ultrasonic Testing of pipes through UTT is a critical practice in the oil and gas industry, playing a significant role in the ultrasonic inspection of pipelines and tanks.

It allows for precise measurement and assessment of corrosion levels, which is vital for the integrity and efficiency of these essential infrastructure components.

Ultrasonic Testing for Pipeline Corrosion Assessment

Oil and gas pipelines are designed with wall thickness considering the facts of Design pressure, Corrosion allowance, and safety factors.

Scheduled inspection, including Ultrasonic Thickness Testing (UTT) and UTT Non-destructive Testing (NDT), is essential to monitor corrosion trends and detect significant thinning, prompting timely repair or maintenance actions for pipeline safety and reliability.

To ensure the Integrity of Pipelines, companies perform re-evaluations of the estimated lifespan (Ultrasonic Tank Testing) when corrosion rates deviate from expected values, potentially requiring earlier replacement or maintenance schedules, emphasizing the significance of UTT inspection.

Factors Affecting Corrosion Rates

The variations in Corrosion rates are a critical concern. Several factors can influence corrosion, including:

  • Chemical Composition of the Transported Fluids
  • Flow Rate and Turbulence
  • Temperature
  • Pressure
  • Microbial Influences

These factors, when considered alongside environmental conditions, chemical composition, and other variables, play a vital role in managing and mitigating corrosion within oil and gas pipelines.

Regular assessments and a comprehensive understanding of these factors are crucial for ensuring pipeline safety and longevity.

Corrosion Thickness Testing Using UTT

  • The Corrosion allowance is decided by pre-existing data of corrosion rate for a specific environment and carrying liquid.
    Based on the corrosion rate the life of the pipeline or tanks is estimated.
  • There are also possibilities that the corrosion rate may vary more than predicted.
    Depending on the climate and characteristics of the processing fluids.
  • The wall thickness should be periodically checked to monitor the reduction in wall thickness.
     If any low-thickness areas, lower than the minimum allowed wall thickness are noticed, the Pipelines or tank shall be repaired.
  • If the rate of corrosion is noted to be faster than estimated the pipeline or tank life shall be redefined and the next inspection period shall be planned earlier than planned initially.
  • Corrosion rates can be calculated by finding the difference between the previous thickness reading and the current thickness reading and dividing the data by the time between the two inspection dates.


The use of advanced UTT machines, a fundamental aspect of Ultrasonic Thickness Testing (UTT), is crucial for the Ultrasonic Testing of pipes, ultrasonic pipeline inspection, and ultrasonic tank testing in the Oil and Gas Industry.

These machines provide more accurate data for UTT inspection, allowing for a comprehensive assessment of Corrosion in Pipeline Tanks, making it an essential component of UTT NDT.

They can scan both unpainted and painted surfaces, offering a clear view of the condition of pipes and tanks.

These collected readings aid companies in making informed decisions regarding maintenance and repairs.

Maintaining the integrity of oil and gas pipelines, through techniques such as UTT, is indeed a complex task.

UTT testing ensures that Pipelines remain safe, reliable, and within their expected operational lifespans, even when faced with the challenges posed by varying Corrosion rates due to factors like climate and fluid characteristics.

This proactive approach to pipeline maintenance is essential for the safety of operations and the protection of the environment.

We offer Ultrasonic Thickness Gauging and corrosion mapping services for the above-mentioned purposes.

Key Takeaways

  • UTT is a crucial Non-destructive Testing Method used for ultrasonic testing of pipes and pipeline tanks in the oil and gas industry.
  • It enables precise Measurement of Wall Thickness, which is essential for assessing corrosion levels and ensuring pipeline integrity.
  • UTT allows engineers to compare Ultrasonic Testing pipeline data with the original design thickness, helping to assess the impact of environmental conditions and fluid characteristics on corrosion rates.
    This assessment is vital for estimating the pipeline's lifespan and optimizing maintenance schedules.

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