Pipeline Repair

09 October, 2013


Pipeline Inspection and Repair

9 October 2013 Aberdeen Evening Meeting

Chairman David Kaye, Aquamarine Power




Fast Reaction Bespoke Solutions for Subsea Repair
Paul Booth, Engineering Manager, Intervention and Autonomous Systems, Subsea 7

Despite all the pre-planning, engineering and stockpiled hardware, there are occasions where a high quality bespoke solution has to be engineered in the minimal possible time. This presentation looks at a number of bespoke, deep water pipeline repairs carried out over the past 18 months. The deep water application brings added complexity due to the need for ROV installation. The repairs were designed, tested and proceduralised by Subsea7 in conjunction with client/operator requirements, and with input from third parties where additional specialised fabrication or equipment was required.

Subsea Digital Radiography of a Blocked Pipeline
James McNab, Global Technology Manager, Oceaneering International Inspection

Subsea transmission pipelines periodically require internal operations with mechanical “pigs” and “plugs”. These pigs and plugs can become stuck inside the pipeline for various unexpected reasons. It is unusual for operators to track the pig or plug along the full length of the subsea pipeline due to cost and access and the only positioning information usually available is by estimates of the volume of fluid pumped. The difficulty in finding the pig or plug can be compounded if the pipeline is heavy-walled, buried or coated. This paper describes a successful operation for locating a stuck plug and confirming its exact position within a buried 30pipe-in-pipe system. The plug was located using a combination of pressurisation/depressurisation sequences to calculate the approximate distance to the blockage, cleaning pigs with acoustic transponders to refine the location, and finally computed radiography.

Reinstatement of Foinaven Riser-Pullhead Bolted Connection
Neil Stagg, BP Subsea and Pipelines Team, Subsea Projects

Often solutions to unique problems are driven by outside constraints such as availability of specialist vessels, replacement time for main system elements and maximising summer weather opportunities. presentation discusses execution of a concept that evolved through lateral thinking to solve a West of Shetland pipeline-riser bolted connection requirement – and without specialist construction spreads or long lead times. This opens up capabilities for a new approach to subsea bolted connections.

SUT+ Pre-Talk, Pipeline Inspection and Repair
David Kaye, Chief Engineer, Aquamarine Power

Offshore pipelines represent a significant investment and a critical part of an operator’s export infrastructure. A significant amount of effort and expenditure is spent each year in inspecting offshore pipelines, and occasionally, much more effort is spent on repairing damaged pipelines and bringing them back into service. This presentation gives a beginner’s guide to the different pipeline inspection techniques and approaches to pipeline repair.