Peritus staff are leaders in the fields of offshore pipeline and subsea cable engineering. They often speak at conferences in the UK and internationally. We have made a selection of the papers they have presented available on this page. The selected papers cover ultra-deepwater pipelines, risers and marine energy.
If you would like any more information on the topics discussed in these papers, please contact us and we would be pleased to help. Note that where full versions of the papers are not provided Please get in touch and we will send them to you if copyright restrictions allow.
Abstracts
Ultra deep water pipelines
Eliminating the Precommissioning Hydrotest for Deepwater Gas Pipelines
A preliminary case has been developed for using alternative integrity validation (AIV) for deepwater gas pipelines in place of the
precommissioning hydrotest. The features of an AIV program that would compensate for lack of a hydrotest have been identified. Measures to
prevent or detect linepipe damage or deterioration during transportation and installation are discussed. Quantitative reliability analysis methods
have been explored to compare the effectiveness of AIV and the traditional hydrotest in exposing the types of flaws typically found in girth welds. Recommendations are made for the collection of data on flaw frequencies and size distributions, as lack of these data is currently an impediment to the full application of probabilistic models.
The Production and testing of JCOE Linepipe for the Middle East to India Deepwater Pipeline’s 3500m application
The Middle East to India Deepwater pipeline calls for line-pipe to be installed in water depths approaching 3500m.
Design of the wall thickness suitable for such depths has utilised DNV OS-F101 (2010) design code, modified to included an enhanced fabrication factor αfab of 1.0, based on the heat soaking effect during a standard 3 layer coating process. In 2011 and 2012 two Indian pipe mills, manufactured line-pipe to MEIDP diameter, wall thickness and
specification by JCOE method. In order to facilitate testing of line-pipe joints during production, a ring test rig and methodology have been developed that facilitates ring tests on full scale ring slices 50mm in length in the pipe mills within a few hours, thus allowing its inclusion in the line-pipe ITP as a standard production test.
This paper presents the basic wall thickness design requirements and tracks the production and subsequent ring collapse testing of the MEIDP line-pipe by the JCOE method. The test program showed that the ring testing method was well suited to being performed on a production basis and was capable of achieving consistently repeatable collapse capacity results. The ring tests also clearly demonstrated the positive effect on the collapse capacity of heat soaking the pipeline at simulated coating 3LPP coating temperatures. Detailed results of the ring collapse testing both before and after heat soaking will be presented.
Inspection Maintenance and Repair of Deepwater Pipelines
• Requirements for pipeline inspection: what, when and how
• Pipeline maintenance and routine inspection
• Pipeline damage during installation and operation in deepwater, causes and effects
• Understanding the risks
Middle East India Deepwater Pipeline (MEIDP) – Geohazard Features Assessment and Intervention at the Owen Fracture Zone and Indus Fan
The Middle East to India Deepwater Pipeline (MEIDP) will be the deepest major infrastructure pipeline laid, with
water depths exceeding 3000m for significant sections of the 1300km route. In addition to its depth, the MEIDP will potentially have to contend with significant
geohazards, located in the areas of the Indian and Omani continental slopes, the Owen Fracture Zone and the Indus River Abyssal Fan.
This paper uses the findings of the 2013 geophysical reconnaissance survey in the area of the Owen Fracture Zone, where the route crosses a strike slip fault between
the Arabian and Indian plates, and the Indus River Abyssal Fan, where the route crosses a complex deep channel system which may be an active zone of debris
and turbidity flow. A feasible route through these geohazards is presented, together with the design process and guidelines for dealing with fault crossings, associated debris and
turbidity current flow, slope stability and run-out
Risers
Ranking the Severity of Ocean Waves for Flexible Riser Design – Extreme and Fatigue
This paper addresses methods and case studies for ranking the severity of ocean waves to allow efficient design of dynamic flexible risers. The methodology is based on motions analysis of a flexible riser hang-off location on a floating platform. The types of ocean wave models considered include long-crested (regular and irregular) seas and short-crested irregular seas.
Marine Energy
Design and Engineering of the Wave Hub Project
Wave Hub is a ground-breaking renewable energy project to create the UK’s first offshore facility for the operation of wave energy converter arrays. Wave Hub provides an area of sea with grid connection and planning consent where arrays of devices can be operated. The project poses a number of unique engineering challenges in the design of the offshore facilities and subsea power cable, in part due to the nature of the devices that will connect to the Wave Hub, but also due to the high energy environment in which the infrastructure will be placed. This paper provides a brief overview of the project along with a description of the design and engineering activities undertaken
Carbon Capture and Storage (CCS)
The Teesside Low Carbon Project
The Teesside Low Carbon Project Consortium is developing a full chain carbon capture and storage (CCS) project. The capture and power
plant is to be located at Teesside together with an infrastructure to transport the captured carbon dioxide (CO2) into either an aquifer for
storage or to three various oil Fields for Enhanced Oil Recovery (EOR) and storage. The CO2 will be transferred offshore via an onshore 5km
pipeline, installed by way of horizontal directional drilling (HDD). A 443km long pipeline will then transport the CO2 via the storage aquifer,up to the Maureen, Balmoral and MacCulloch Oil Fields for injection.
Peritus provides subsea system engineering including pipelines, risers, structures, cables, control systems and umbilical design, to the offshore energy industry.
