Key elements defined within the RP include:
There are even industry debates about certain recommendations within the RP. For instance, some NDT experts argue that the use of Immersion Ultrasonic Testing (IUT) for pipeline girth welds, while recommended as an option in the RP, has no advantage over other methods and can be one of the most costly and least useful supplementary NDT options.
This stage documents the specific performance of an AUT system. This includes assessing its inherent functionality—the non-changeable hardware, software, and calibration philosophy. It also establishes the system's POD and sizing capabilities for a defined range of application variables (e.g., material type, wall thickness).
Executing physical qualification loops with dozens of welded samples is immensely expensive and time-consuming. To optimize this, the modern NDT industry utilizes software like to simulate ultrasonic beam behaviors within pipeline girth welds. dnv-rp-f118
Physical qualification is both costly and time-consuming. Modern engineers often use NDT simulation software, such as , to supplement physical tests.
: Evaluation of system documentation and operating methodology.
The guideline treats flaw detection as a statistical distribution, requiring quantifiable metrics for two critical parameters: Key elements defined within the RP include: There
Establishing not just if a flaw is detected, but how accurately the system can measure its dimensions. Where to Find the Full Text
: Offer a recommended scope for project-specific validation to ensure consistent performance across different materials and project parameters.
Originally introduced in and updated in 2017/2021 , it ensures that inspection systems can reliably detect and accurately size defects, thereby maintaining the structural integrity of offshore submarine pipelines. 1. Core Objective and Scope To optimize this, the modern NDT industry utilizes
While DNV-RP-F118 can be applied to a wide range of materials, it includes important caveats. Special care must be taken for applications where the material properties could affect ultrasonic wave propagation. This is particularly relevant for , where the speed of sound varies with direction, or in materials that cause inconsistent wave physics. In such cases, a specific assessment is required to determine whether the RP can be adequately implemented.
AUT is the technology at the heart of this RP. Unlike manual ultrasonic testing, which relies on a human operator's skill, AUT uses mechanized scanners and sophisticated software to perform inspections. It is the most widely used NDT method for pipeline girth welds due to its speed, consistency, and ability to provide a permanent digital record of the inspection.
As the world moves towards decarbonization, pipelines are being repurposed to transport hydrogen. This presents new material challenges. DNV has launched a new JIP to investigate the effect of hydrogen on commonly used pipeline repair systems, including the welded shells often inspected using AUT qualified under RP-F118.
AUT systems offer several critical advantages over legacy radiographic techniques: