Thermo-Mechanical Design of Canapu PIP System

Solano, Rafael Familiar; Azevedo, Fabio B. de; Carr, Malcolm; Tindall, Leanne; Dolinski, Anderson; Valer, Carlos

doi:10.1115/omae2009-79713

Cited by 3 publications

(1 citation statement)

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“…Further detail on the Canapu lateral buckling design can be found in [12]. A series of qualification test was also performed to establish the fitness-for-purpose of the buoyancy modules.…”

Section: Lateral Buckling Mitigation Strategy and Buoyancy Modules Qumentioning

confidence: 99%

Design, Fabrication and Installation of the First Ever Reeled Pipe-In-Pipe System in Offshore Brazil

Azevedo¹,

Solano²,

Manouchehri³

et al. 2009

Proceedings of Offshore Technology Conference

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The domestic demand of gas is increasing in Brazil. Petrobras is responding to this challenge by bringing several gas fields on stream offshore Brazil. Among them is the Canapu field, located east of the State of Espirito Santo, about 75 km off the coast, in a water depth of 1608 m. The produced gas is transported using a 20 km long pipe-in-pipe (PIP) system to the Cidade de Vitoria floating, production, storage and offloading system (FPSO) located in the Golfinho field to be processed and then exported onshore through an existing gas pipeline.Technip was awarded an engineering, procurement, construction and installation (EPCI) contract and was responsible for the detailed design and installation of the first ever reeled PIP system offshore Brazil. The project was awarded on a fasttrack basis, which required design, qualification, fabrication and installation of the PIP system in less than 18 months. The scope also included two pipeline end terminations (PLET) with seven gate valves, free span rectification, the crossing of three flexible flowlines, and, pre-commissioning activities (flooding, cleaning, gauging and hydrotesting). The PIP system was also prone to lateral buckling, which required definition of a robust mitigation strategy.The design requirements for the Canapu PIP system involved the design and qualification of several technically advanced components and novelties in PIP design including the application of the first ever reelable mechanically clamped waterstop system and the use of buoyancy modules for lateral buckling management on a PIP system. This paper presents the overview of the design, fabrication and installation of Canapu PIP system as well as a summary of the qualification test program performed for the different PIP system components.

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“…Further detail on the Canapu lateral buckling design can be found in [12]. A series of qualification test was also performed to establish the fitness-for-purpose of the buoyancy modules.…”

Section: Lateral Buckling Mitigation Strategy and Buoyancy Modules Qumentioning

confidence: 99%

Design, Fabrication and Installation of the First Ever Reeled Pipe-In-Pipe System in Offshore Brazil

Azevedo¹,

Solano²,

Manouchehri³

et al. 2009

Proceedings of Offshore Technology Conference

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Feedback Analyses of Pipeline Embedment Over As-Laid Survey Results

Carneiro¹,

Gouveia²,

Parrilha³

2010

29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts a and B

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The as-laid embedment is a key parameter in the design of non-buried rigid pipelines. Large discrepancies are observed, for example in the number and length of predicted free spans, or in the global response to thermo-mechanical expansion, when this parameter is misevaluated. The employment of wide ranges to cover the uncertainties and ensure safety may hugely increase the project costs by mitigating what could not be an actual concern. Conversely, there is no reliable method to accurately predict this embedment. The large strains imposed to the soil dishearten the use of finite element analyses, while physical model tests are as well subjected to the scatter in soil parameters along pipeline route (increased by the sampling under harsh conditions); and mostly to the dynamic motions that occur during the lay process which are difficult to quantitatively foresee. This last effect causes pipelines to embed deeper, as the seabed soil is both softened and physically displaced by the pipeline motion. Engineering practice has been using empirical models, which are always subjected to calibration and applicability range issues. This paper presents the results of feedback analyses of six rigid flowlines (ranging from 174mm to 353mm diameter) recently installed on clayey seabed offshore Brazilian coast, in water depths between 1087m and 1628m. The embedment values, measured by as-laid surveys, were used to reassess model parameters calibration. Results indicate encouraging agreement with published works. Statistical treatment of the data led to smooth distributions, which might be useful in future projects employing probabilistic design approach.

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Design Aspects of Pipe-in-Pipe Systems for HP-HT Applications

Sriskandarajah

Ragupathy

Rao

2016

Day 2 Tue, May 03, 2016

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The High Pressure and High Temperature (HP–HT) subsea field developments are increasingly using Pipe-In-Pipe (PIP) systems for transportation of production fluids due to superior thermal conductivity performance compared to wet insulated single pipe system. PIP systems can provide the necessary thermal insulation with very low Overall Heat Transfer Coefficient (OHTC) in the order of 0.5 to 1.0 W/m2.K whether installed exposed on the seabed or trenched and buried. An additional inherent feature of PIP systems is that they offer increased protection against third party interaction such as fishing gear and dropped object impact. PIP system will provide a very long "no touch time" before any intervention (e.g. depresurisation) becomes necessary. This aspect can also be improved by using e.g. hot water circulating and electrical heating in order to overcome difficulties which may arise from prolonged shutdown periods. The mechanical design of a HP–HT PIP systems is more complex than conventional single pipe system and involves consideration of additional failure modes. This paper gives an overview of the PIP system design, with particular emphasis on in–service buckling and fatigue design. Design considerations for trawl gear impact on lateral buckling and operational aspects of clad and lined pipes for HP–HT and sour service applications are also discussed.

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Thermo-Mechanical Design of Canapu PIP System

Cited by 3 publications

References 0 publications

Design, Fabrication and Installation of the First Ever Reeled Pipe-In-Pipe System in Offshore Brazil

Design, Fabrication and Installation of the First Ever Reeled Pipe-In-Pipe System in Offshore Brazil

Feedback Analyses of Pipeline Embedment Over As-Laid Survey Results

Design Aspects of Pipe-in-Pipe Systems for HP-HT Applications

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