Qualification of Unbonded Flexible Pipe to API and DNV Standards

Kalman, Mark; Liang, Yu; Durr, Casey; Suarez, Jorge

doi:10.4043/25092-ms

Cited by 4 publications

(2 citation statements)

References 9 publications

(10 reference statements)

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“…been established yet for the anti-collapse design of flexible risers and therefore, how to predict the critical pressure is still a gray area for riser designers [20].…”

Section: Collapse Of Flexible Risers Refers To Radial Buckling Of Thementioning

confidence: 99%

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Jiang

Hopman

2018

Applied Ocean Research

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Flexible riser is a key enabler for the oil and gas production in ultra-deep water which transports production fluids between floating production systems and subsea wells. As oil and production heads to water depths in excess of 3000 m, high hydrostatic pressure has been one primary challenge facing the riser operators. Excessive hydrostatic pressure may cause collapse failure of flexible risers and thus predicting the critical collapse pressure is of significant importance to their anti-collapse design. Collapse is a complex phenomenon related to the material properties, the geometry of the pipe and its overall surface topography. Those factors make the prediction of critical pressure of flexible risers challenging. Related prediction approaches of collapse pressure of flexible risers have been developed for decades, yet a comprehensive review of their predictive capabilities, efficiency and drawbacks is lacking. This paper reviews the recent advances on collapse studies of flexible risers and highlights the gaps in existing prediction methods, aiming to facilitate the current anti-collapse design of flexible risers and provide a baseline for their future utilization in deeper water expansion.

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“…been established yet for the anti-collapse design of flexible risers and therefore, how to predict the critical pressure is still a gray area for riser designers [20].…”

Section: Collapse Of Flexible Risers Refers To Radial Buckling Of Thementioning

confidence: 99%

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Jiang

Hopman

2018

Applied Ocean Research

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“…The use of composites is further discouraged through the absence of a standard qualification process for composite pipelines. This matter however was studied by Kalman, Yu, & Durr [24] which provided an extensive qualification process as well as a roadmap. Regarding the weight issues as well as the advantages of composite materials, a new design of flexible pipeline which adopts a woven configuration is developed.…”

Section: External Sheathmentioning

confidence: 99%

Numerical comparison between single layer woven flexible pipe and reinforced thermoplastic pipe

Akram¹,

Zainal²,

Albarody³

et al. 2017

J. MECH. ENG. SCI.

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The weight of a conventional flexible pipe and corrosion poses a major challenge for pipelines at significant water depths, making composite material an ideal alternative for steel in the armor layers. A woven configuration was developed for the armour layer by utilising glass epoxy, namely the woven flexible pipe. However, the performance of the woven flexible pipe in deep water conditions are unknown, thus the need for a numerical analysis. In this paper, an initial comparison was conducted for the woven flexible pipe with a typical bonded flexible pipe called the thermoplastic reinforced pipe, where one layer of the woven flexible pipe is considered to show its performance. The results showed higher stress experienced by the woven flexible pipe as compared to the reinforced thermoplastic pipe, where the lowest difference was 50.8%. It was also shown that the woven flexible pipe can withstand the 6 MPa internal pressure at a thickness of 6 mm and above. The result is still inconclusive as an experiment test is required to validate the results. However, it serves as a good estimation of the expected result for future experimental test.

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Qualification of Flexible Fiber-Reinforced Pipe for Ultra-deepwater Applications - Update on Phase 1 Engineering and Phase 2 Prototype Testing

Salimi¹,

Kalman²,

Lin³

et al. 2014

Day 2 Tue, May 06, 2014

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This paper presents the result of the Phase 1 engineering study for a RPSEA sponsored project to develop, qualify, and field deploy flexible fiber reinforced pipe (FFRP®) for ultra-deepwater applications. In addition, the Phase 2 qualification testing scope of work is presented. FFRP is unbonded flexible pipe with composite reinforcement layers which has the advantages of light weight, high flexibility, and corrosion resistance. Due to these advantages, a simple, low top tension riser configuration is enabled. The design basis is a 7-inch ID, 690 barg design pressure, 120°C design temperature, 3048 meter design water depth production riser for a Gulf of Mexico application. The Phase 1 Engineering Study confirmed the product and system design to be employed in the subsequent phases. In Phase 2, a prototype pipe will be manufactured, and qualification testing will be conducted in accordance with API RP 17B recommendations. With successful testing, and subject to approval via a Phase 2 decision stage gate, Phase 3 will be an actual field deployment of the riser system with six months of performance monitoring. Included in the paper is a summary of the Phase 1achievements and task deliverables. Due to its high level of importance, a relatively large portion of the paper is dedicated to the design of the FFRP structure and system, covering final pipe cross section arrangement, the riser system configuration and the results of analyses to provide a reliable prediction of the product's behavior in various working conditions. In addition, a review of the Phase 2 plan is presented. The outcome of the on-going phase 2 qualification testing will be utilized to calibrate the design models and to confirm the suitability of the pipe design, and the riser configuration.

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Qualification of Unbonded Flexible Pipe to API and DNV Standards

Cited by 4 publications

References 9 publications

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Numerical comparison between single layer woven flexible pipe and reinforced thermoplastic pipe

Qualification of Flexible Fiber-Reinforced Pipe for Ultra-deepwater Applications - Update on Phase 1 Engineering and Phase 2 Prototype Testing

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