Overview of Magnetic Flux Leakage (MFL)

Nondestructive testing (NDT) careers are on the rise in today’s economy. These fields are constantly advancing, and there is an ever-growing need for technicians, quality assurance specialists and inspectors as infrastructure in the United States continues to age.

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This article explains the Statistically Active Corrosion Assessment, which is a tool for determining appropriate and realistic corrosion growth rates which can assist pipeline operators in optimizing the value of in-line inspection data, remediation programs and excavation costs, and determine a re”‘inspection interval; all while maintaining safety.

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The purpose of this article is to describe the various in-line inspection (ILI) technologies that are currently available to the market. The pros, cons, and applicability of each type of tool will be discussed in greater detail.

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Refinery, petrochemical, and storage tank operators are responsible for properly cleaning facility tanks on a periodic maintenance basis, typically in 20 to 30 year increments. This article provides a suggested “checklist” of inspection activities to ensure safe and reliable operations after cleaning.

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Nondestructive Testing (NDT) makes up the majority of testing performed in our industry. There many different types of nondestructive testing techniques. Each method has its own advantages and disadvantages; each can detect different types of flaws. Some are simple to perform, others are difficult. Some are used on several different types of equipment, others are more restricted.

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Auto-refrigeration can impose low temperatures onto process vessels and piping causing them to be at risk of brittle fracture, the sudden break-before leak phenomena that can result in catastrophic rupture of the equipment.

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We talk about heat exchangers quite a bit here on Inspectioneering, most recently in the January/February issue of the Journal. This is because heat exchangers are vital pieces of equipment in nearly every type of plant or facility.

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The pigging industry has developed a tremendous range of techniques and technologies, and it is probably fair to say that there are few pipelines in the world that cannot be cleaned and inspected, although the success of such operations will often depend on the available budget.

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Technicians inspecting oil & gas installations and petrochemical plants employ a wide variety of nondestructive testing (NDT) techniques. A new technology has recently been developed that utilizes a real-time portable imaging device which has distinct advantages in finding internal corrosion.

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We have discussed various factors that can affect the reliability of NDE techniques (i.e., probability of detection - POD and sizing accuracy) in Part 1. In general, it is difficult to quantify these uncertainties. In fact, it is impossible to fully quantify the uncertainties in NDE results. However, one can achieve a higher level of reliability by reducing or minimizing the uncertainties. We will discuss some of the steps one can take to minimize the uncertainties in NDE results. By minimizing or reducing the uncertainties in NDE results, FFS assessments can be less conservative, and thus provide more margin to the serviceability of the equipment.

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This publication outlines 101 Essential Elements that need to be in place and functioning well in order to effectively and efficiently preserve and protect the reliability and integrity of pressure equipment (i.e. vessels, exchangers, furnaces, boilers, piping, tanks, and relief systems) in the refining and petrochemical industry.

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