Shell Global Solutions Completes the Offshore Oil Industry's First Strake Removal / Fairing Installation Retrofit to Reduce Drag and Vortex-Induced Vibration on Deepwater Riser

    HOUSTON, March 30 /PRNewswire/ -- Shell Global Solutions (US) Inc. has
 successfully completed the industry's first replacement of vortex-induced
 vibration (VIV) helical strakes with patented ROV retro-fit fairings along a
 595-ft. stretch of catenary pipeline riser on Murphy Oil Corporation's Medusa
 SPAR, located at 2250 ft. water depth in the Gulf of Mexico.
     (Logo:  http://www.newscom.com/cgi-bin/prnh/19990716/SHELL )
     By combining the patented RIVET NB(TM) VIV suppression fairing
 installation tooling and helical strake removal tooling developed by Shell
 Global Solutions, the replacement took just 24 days, including mobilization
 and demobilization.  This deepwater catenary riser retrofit is an efficient
 method for replacing high drag helical strakes with lower drag fairing-style
 VIV suppression devices.
     The RIVET NB installation system was developed and tested by Shell Global
 Solutions.  It easily adapts to different diameter fairings to accommodate a
 wide range of pipeline sizes.  The compact system requires relatively little
 deck space, which allows the use of small offshore construction vessels or
 minimal deck space onboard an existing structure.  The RIVET NB system is
 mated to the ROV remotely, while subsea, and can then be taken as far as the
 ROV excursion tether allows to install its fairing / thrust collar set.  The
 RIVET NB system takes two fairing / load collar sets per trip, minimizing
 vessel time on location.  Also developed for the project was a set of strake
 removal tools that can accommodate any size strake to be removed.  The helical
 strake removal tool set and the RIVET NB tool systems are designed for low
 impact operation on an existing deepwater vessel or platform.
     Patented suppression fairings from Shell Global Solutions offer superior
 VIV suppression and very low drag loading when compared with conventional
 helical strakes.  The high suppression and low drag properties of these
 fairings can significantly reduce deepwater pipeline costs by reducing the
 over-design needed to accommodate high drag and vibratory loads.  When
 installed for stabilization of horizontal spans, they can also eliminate
 circuitous pipeline routes around sub sea canyons and steep slopes, saving
 time and money.
     With over 2800 professionals, Shell Global Solutions helps its customers
 to maintain their competitive edge, optimize plant and process performance,
 formulate and develop new products and manage operational safety and
 environmental challenges more effectively.  Shell Global Solutions provides
 solutions to a range of customers in the oil, gas, additive, chemical, motor
 sport and industrial sectors.
 
     Notes to editors
     RIVET NB (Remotely Installed VIV Equipment Tool - Neutrally Buoyant) is a
 registered trademark of Shell Global Solutions (US) Inc.
     Vortex-induced vibration (VIV) is recognized as a hazard for deepwater
 offshore oil and natural gas producers.  Vortices, or spinning eddies, are
 created (or shed) when a current of water collides with structures such as
 risers, tendons or pipelines.  These vortices can cause severe oscillations of
 tubular structures in deepwater exploration and production environments.
 Oscillations caused by VIV can result in the bending of offshore tubular
 structures.  This bending can create extremely expensive and environmentally
 hazardous fatigue failures.  Fairings and strakes are devices that are
 attached to the tubular to suppress the vibration caused by vortex shedding.
     In addition to pipeline riser and span retrofit remediation, the VIV team
 from Shell Global Solutions also offers VIV analysis, VIV testing, suppression
 hardware supply and suppression installation services.
     Shell Global Solutions is made up of seven independent technology
 companies within the Royal Dutch/Shell Group of companies.  Together, they can
 draw upon more than 50 years experience in research, development, technical
 services and operational expertise.
 
 

SOURCE Shell Global Solutions Inc.
RELATED LINKS
http://www.shellus.com

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