Subsea umbilicals are a vital component for offshore operations, being responsible to provide hydraulics, fluid injection, power and/or communication services to and from subsea facilities. They can be designed for both static and dynamic applications and can be deployed in harsh environments where potentially damaging factors such as corrosion, tension, pressure, clashing, entanglement, among others are commonly present. For armored umbilicals, the tensile armor wires of these structures are responsible for the tensile strength and its fatigue life is a key design consideration for subsea umbilicals subjected to dynamic loading. Despite its considerable importance, there is no standardized methodology for conducting fatigue tests of tensile armor wires of umbilical cables. Some general guidelines are given in technical publications such as ISO 13628-5 standard and DNV’s recommended practice F401, but there is still need for more detailed information regarding fatigue testing of these components. This lack of methodology for fatigue testing of circular wires that comprise the tensile armor of these structures lead to the motivation for this study. The main advantage of using specific data from an adequate testing methodology of tensile armor wires — instead of using standard SN curves — is to reduce conservatism, mainly considering damage calculations for the overall structure. Additionally, with the increasing operating water depths, an excessively conservative design can lead to a considerably heavier structure which will induce higher topside stresses. Therefore, it is of great importance to have a well defined methodology to obtain SN curves that can be used in the design phase of umbilical cables which can lead to an optimized structure and also keep an adequate degree of conservatism. In this work, it will be presented several attempts to achieve an adequate methodology to obtain SN curves for circular tensile armor wire of umbilicals and the final methodology adopted will be described in detail. Tensile armor wires in a wide range of diameters and strength were tested in order to validate the proposed methodology. Additionally, the normalized fatigue results from several tests are also presented and compared to SN curves commonly used during the design phase of umbilical cables.
Skip Nav Destination
ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
June 25–30, 2017
Trondheim, Norway
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5769-4
PROCEEDINGS PAPER
Proposed Methodology for Fatigue Testing on Umbilical Round Armor Wires
Mariana R. Tagliari,
Mariana R. Tagliari
LAMEF/UFRGS, Porto Alegre, Brazil
Search for other works by this author on:
Tiago B. Coser,
Tiago B. Coser
LAMEF/UFRGS, Porto Alegre, Brazil
Search for other works by this author on:
George Campello,
George Campello
Petrobras, Rio de Janeiro, Brazil
Search for other works by this author on:
Gustavo Matoso,
Gustavo Matoso
Petrobras, Rio de Janeiro, Brazil
Search for other works by this author on:
João Carlos B. Bertoncello,
João Carlos B. Bertoncello
LAMEF/UFRGS, Porto Alegre, Brazil
Search for other works by this author on:
Facundo Argüello,
Facundo Argüello
LAMEF/UFRGS, Porto Alegre, Brazil
Search for other works by this author on:
Afonso Reguly
Afonso Reguly
LAMEF/UFRGS, Porto Alegre, Brazil
Search for other works by this author on:
Mariana R. Tagliari
LAMEF/UFRGS, Porto Alegre, Brazil
Tiago B. Coser
LAMEF/UFRGS, Porto Alegre, Brazil
George Campello
Petrobras, Rio de Janeiro, Brazil
Gustavo Matoso
Petrobras, Rio de Janeiro, Brazil
João Carlos B. Bertoncello
LAMEF/UFRGS, Porto Alegre, Brazil
Facundo Argüello
LAMEF/UFRGS, Porto Alegre, Brazil
Afonso Reguly
LAMEF/UFRGS, Porto Alegre, Brazil
Paper No:
OMAE2017-62020, V05AT04A030; 6 pages
Published Online:
September 25, 2017
Citation
Tagliari, MR, Coser, TB, Campello, G, Matoso, G, Bertoncello, JCB, Argüello, F, & Reguly, A. "Proposed Methodology for Fatigue Testing on Umbilical Round Armor Wires." Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. Volume 5A: Pipelines, Risers, and Subsea Systems. Trondheim, Norway. June 25–30, 2017. V05AT04A030. ASME. https://doi.org/10.1115/OMAE2017-62020
Download citation file:
45
Views
Related Proceedings Papers
Related Articles
On the Fatigue Strength of Wires in Spiral Ropes
J. Energy Resour. Technol (March,1985)
Profiles of Two JOMAE Associate Editors (A Continuing Series)
J. Offshore Mech. Arct. Eng (October,2021)
Fatigue Life Parameter for Type 304 Stainless Steel Under Biaxial-Tensile Loading at Elevated Temperature
J. Eng. Mater. Technol (July,1999)
Related Chapters
Analysis of Components in VIII-2
Guidebook for the Design of ASME Section VIII Pressure Vessels, Third Edition
Pressure Testing
Process Piping: The Complete Guide to ASME B31.3, Third Edition
Completing the Picture
Air Engines: The History, Science, and Reality of the Perfect Engine