Introduction to Offshore Pipelines and Risers

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Introduction Subsea Pipelines are used for the transportation of offshore Hydrocarbons from one Platform to another and or Platform to Shore 4. Pipelines are used for a number of purposes in the development of offshore hydrocarbon resources These include e.

Subsea Pipelines and Risers - 1st Edition

Flowlines to transfer product from a platform to export lines Water injection or chemical injection Flowlines Flowlines to transfer product between platforms Subsea manifolds and satellite wells; 6. Risers A Riser is a conducting pipe connecting sub-sea wellheads, templates or pipelines to equipment located on a buoyant or fixed offshore structure.

Riser Clamp Welding to Jacket member 9. Restrained lines Pipelines which cannot expand or contract in the longitudinal direction due to fixed supports or friction between the pipe and soil Unrestrained lines Pipelines without substantial axial restraint. Maximum one fixed support and no substantial friction.

Nace, C. Vertical stability Sinking in to the sea bed during maximum fluid density condition. The Pipe sinkage is determined as the depth at which the applied pipe pressure equals the soil bearing resistance. Lateral stability It is the capacity to resist the lateral forces due to Environmental loads. Increase in Pipewall thickness Providing Concrete coating Trenching Concrete Mattress Rock dumping OISD - Design and construction requirements for cross country hydrocarbon pipeline. ASME B You just clipped your first slide!

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Obtaining such comprehensive pipeline data is typically more difficult due to remote locations, limited access, challenging designs and extreme operational parameters. These factors lead to reduced inspection options, while also significantly exacerbating expenses and timelines. In response, providers are now pushing both the boundaries of ILI tools and what is considered conventional thinking.

To address the subsea environment, ILI tools have made significant advancements in developing cost-effective technologies to provide modern in-line inspection solutions for challenging subsea pipelines. This free-swimming, self-contained ultrasonic UT tool was designed to successfully inspect and perform in challenging pipe systems.

Introduction to Offshore Pipelines & Risers - Jaeyoung Lee

Modern data acquisition and integrity assessment methods allow the best possible understanding of actual current pipeline conditions. InVista makes use of direct measurement ultrasonics, producing higher resolution data sets with tighter tolerance and more accurate flaw sizing.


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Providing this data allows precise wall thickness values and deformation data in objective, absolute figures. The InVista inspection service allows for higher operator confidence due to exceptional raw data quality. Presently, most ILI inspection in offshore pipeline systems employ tools based on magnetic flux leakage MFL technologies. The MFL data sets record influences to a calibrated magnet circuit based on nominal wall-thickness throughout a pipeline.

Software enables analysts to estimate the geometry of the flaws to create a richer qualitative characterisation.

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Compared with MFL tools, direct measurement UT inspection offers greater accuracy and superior results. By rapidly processing large quantities of ILI wall loss data and evaluating MAOP at distinct locations, the UT inspection serves as a rational and rapid means for prioritising the severity of corrosion throughout a pipeline. By fully employing the detailed inspection data that an advanced UT ILI tool can provide, operators are able to be proactive rather than reactive in their remediation and scheduling.

This practice allows for better planning of inspection frequencies, corrosion growth analysis and repair and mitigation plans. Avoidance of unnecessary repairs due to overly conservative assessment methodology benefits pipeline managers both financially and operationally.

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Advances in modern approaches and comprehensive data assessment for in-line inspection of challenging subsea pipelines offer material improvements over past methods. Historically, the sequence of gathering overly conservative or reduced quality ILI data was extremely prohibitive.

New approaches to assuring the integrity of pipelines and risers

Consideration of corrosion causes and flaw calculations is critical in determining the remaining working life of the pipeline asset, its inspection interval, future repairs, and operational efficiencies. Using modern ultrasonic inspection approaches, offshore operators have a better understanding of the physical condition of a pipe and the unique degradation mechanisms affecting it. Edited by Angharad Lock. Williamson explores how a common misinterpretation of an ASME Boiler Pressure and Vessel Code influences pig launcher design—adding unnecessary cost and time that can never be recovered.

Quest Integrity Group announces new software for fatigue analysis on seam crack flaws in pipelines. This content is available to members only.

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