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research-article

FULL-SCALE FAIRING QUALIFICATION TESTS

[+] Author and Article Information
Yiannis Constantinides

Chevron Energy Technology Company Houston, TX, United States of America
ycon@chevron.com

Stergios Liapis

Shell Oil Company Houston, TX, United States of America
Stergios.liapis@shell.com

Don Spencer

Oceanic Consulting Corporation St. John’s, NL, Canada
Spencer.Don@oceaniccorp.com

Mohammed Islam

Oceanic Consulting Corporation St. John’s, NL, Canada
Islam.Mohammed@oceaniccorp.com

Kjetil Skaugset

Statoil Oil Company Trondheim, Norway
kjska@statoil.com

Apurva Batra

Chevron Energy Technology Company Houston, TX, United States of America
apurva@chevron.com

Rolf Baarholm

Statoil Oil Company Trondheim, Norway
rolbaa@statoil.com

1Corresponding author.

ASME doi:10.1115/1.4036373 History: Received April 27, 2016; Revised March 15, 2017

Abstract

Production risers as well as drilling risers are often exposed to ocean currents. Vortex-induced vibrations (VIV) have been observed in the field and can cause fatigue failure and excessive drag on the riser. In order to suppress VIV, fairings are often used. This paper presents qualification tests for two types of fairings: The short crab claw (SCC) fairings, and the Aims Dual Flow Splitter (ADFS) fairings. The short crab claw fairing design is a novel design patented by the Norwegian Deepwater Project (NDP). As will be detailed in this paper, both the SCC and ADFS designs offer very low drag, completely suppress VIV and are effective even when they are in tandem. A model test campaign was undertaken in the 200-meter towing tank facility at the Ocean, Coastal and River Engineering in St. John’s Canada. A rigid pipe with a diameter of 0.3556 m (14”) was utilized for the experiments. This corresponds to prototype size for a production riser and a 1:3.8 scaled model for a 1.3716 m (54”) drilling riser. The program had two parts: 1) single pipe tests and 2) tests of two pipes in tandem (interference tests). Both fairings (SCC and ADFS) were very effective in suppressing VIV and reducing drag. The ADFS fairings are most effective for a span to diameter ratio of 1.75. For all fairing geometries, it was found that a small taper increases the fairing effectiveness considerably.

Copyright (c) 2017 by ASME
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