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Keywords: strake
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Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2018
Paper Number: OTC-29060-MS
.... The TDZ fatigue damage is observed to be lower when background current is applied along riser in the motion fatigue analysis, even if the current direction is perpendicular to the riser motion direction. Finally, the motion fatigue response is observed to be better with a shorter strake length compared...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2014
Paper Number: OTC-25432-MS
... architecture there may be a large number of pull tubes arranged within the truss in a complex, tightly-spaced array, where the spacing varies with elevation. Individual tubes may be fitted with strakes or other devices intended to suppress flow-induced vibrations. Fatigue of these tubes is an important...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 6–9, 2013
Paper Number: OTC-24232-MS
... for continuation of the design cycles as needed to satisfy all requirements. Adjustments to the design were accomplished through addition, deletion, or re-positioning of buoyancy modules, strakes, fairings, and centralizers. 4 OTC 24234 The overall riser design regimen included these primary cases: strength design...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2010
Paper Number: OTC-21029-MS
... heights and robust mooring considerations. The MinDOC's global performance has been modeled experimentally and numerically with good correlation. VIM behavior was determined experimentally, and suppression is achieved by only straking the interior portion of the upper columns, which simplifies horizontal...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2009
Paper Number: OTC-20295-MS
... upstream oil & gas riser surface bop fatigue lifetime alert stress joint strake minimum lifetime otc 20295 OTC 20295 SBOP Drilling Enables Efficient Drilling in Extreme Water Depths Michel Dib(1), Lin Zhu, and Jane Lou, Intecsea, and Mitchell Bassey, Frontier Drilling Copyright 2009...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2008
Paper Number: OTC-19289-MS
... Abstract Helical strakes are an important Vortex Induced Vibration (VIV) suppression device for Steel Catenary Risers (SCR's). This paper presents the results of two sets of hydrodynamic tests performed at MARIN, on a 12?? pipe fitted with 16D Helical Polyethylene strakes. The first set...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2007
Paper Number: OTC-18973-MS
... transition otc 18973 adf strake suppression device diameter bare pipe offshore technology conference coefficient OTC 18973 Enabling Enhancements of Riser VIV Design Techniques Through Detailed Interpretation of Test Results for VIV Suppression Devices Don Spencer, Oceanic Consulting Corp.; Steve...
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 3, 2007
Paper Number: OTC-18584-MS
... Block 920 (MC920) in 8,000 ft water depth. The SCRs are for high pressure and low temperature gas production service. The Vortex Induced Vibration (VIV) suppression system of these SCRs comprises of a combination of fairings and strakes to achieve the thermal requirements for the minimum target 18oF...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2006
Paper Number: OTC-18362-MS
... become a significant challenge to structure and pipeline designers as offshore energy development moves into ever deeper water. Suppression Strategies VIV can be limited by using several methods. One method shortens the vortices correlation length by installing helical fins known as strakes...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 2006
Paper Number: OTC-18276-MS
... Abstract Triple helical strakes can play an important role in the suppression of VIV on offshore platforms. This paper will present results of two field experiments, one conducted at Lake Seneca in upstate New York and the second in the Gulf Stream near Miami, Florida. Three different...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2005
Paper Number: OTC-17300-MS
... Abstract The Holstein truss spar is the largest spar hull ever built with a diameter of 45.5m. Holstein's strakes are unique for this and many other reasons. Vortex Induced Motion (VIM) model tests showed that in this area of high loop currents in the Gulf of Mexico, hull strake coverage...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2005
Paper Number: OTC-17524-MS
... during the welding operation. With the VIV strakes and a strain monitoring system being installed over the complete length of the SCRs the installation had to be as efficient as possible. This resulted in several adjustments to the designs during the preparation phase. In addition a huge SPAR preparation...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2005
Paper Number: OTC-17333-MS
... skidways was painting and installation of anodes. On leg tube sections continuous strake plates were installed. Piping for the ballast system is run outside the tubes and was installed after hard tank assembly. At the assembly area two 600 ft long by 38 ft wide skidways were constructed. Six pairs...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16340-MS
... Abstract The bare-pipe riser vortex induced vibration (VIV) experiments described in Tognarelli et al [1] were extended to examine the influence of various lengths of strake coverage on riser vibrations. The objective of the tests was to demonstrate whether present riser VIV prediction...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16186-MS
... Abstract This paper presents experimental results for various helical strake geometries and discusses their performance coefficients and responses. Experimental results from the presence of surface roughness and/or interference (i.e., the presence of upstream tubulars) are also presented.A...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16636-MS
... offshore pipeline water depth offshore technology conference transportation system mattress optimization criteria requirement acceptance criteria sigsbee escarpment resistance midstream oil & gas assessment technology conference span wall thickness otc 16636 strake engineering intec...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 3–6, 2004
Paper Number: OTC-16600-MS
... VIV suppression fairings. Fairings were found to be superior to commonly used helical strakes due to their light-weight, low-cost and low-drag properties. VIV suppression fairings developed by Shell GSUS (Figure 2) weathervane to keep the vortex-interrupting fin on the downcurrent side of the tubular...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2003
Paper Number: OTC-15106-MS
... domain packages together with a number of time domain options which we now disc subsea system equation load case wake oscillator model amplitude cylinder vibration strake frequency offshore technology conference heave-induced viv upstream oil & gas vortex viv fpso vortex...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2003
Paper Number: OTC-15242-MS
... Abstract In order to evaluate the Vortex Induced Vibration (VIV) response of truss Spars and to optimize their strake configuration several model test programs have been carried out at MARIN. The results show that it is possible to optimize the strake design of Spars to obtain minimum VIV...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 2003
Paper Number: OTC-15243-MS
... strakes and other appurtenances located on the outside of the Spar. Directional stiffness and drag augmentation due to VIV may also affect maximum offsets and mooring line loads. Two analysis methods are presented to determine governing mooring loads in the presence of Spar hull VIV. The first, called...

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