Louise Ledgard

  • Recent severe storms in the U.K. North Sea have resulted in a number of floating production, storage and offloading vessels (FPSOs) being shut down in order to assess and repair the damage caused. Notwithstanding the possible safety implications for operations crew, oil and gas majors are facing weeks, if not months without a critical asset which in turn, is having a significant impact on future production.
     

    The design and operation of an FPSO in remote locations requires detailed information on the structural response of the vessel within the local environment offshore.  Monitoring of critical components including the risers, hull and mooring lines simultaneously with the local environmental forcing of waves, wind and currents at the site location, provides a valuable insight into the performance and possible extension of the integrity life of the asset.  As new technology is introduced, riser design becomes more sophisticated and extension of design life is required. Also, it becomes increasingly important to monitor an asset’s performance to assist with operational decisions, forensic investigation of marine incidents and the evaluation of design codes.

    Over the last few years, an increase in the number of offshore incidents related to FPSOs in the North Sea during extreme storm conditions has resulted in focused attention on the verification of design codes and a review of inspection procedures. With an average mooring failure projected at 8.8 years for an FPSO in the North Sea and the consequential damage this could have on the riser, a number of Joint Industry Partnership (JIP) initiatives have concluded that the management and audit of the FPSO integrity is required. Furthermore, indicative costs resulting in the remediation activities required for a single mooring line alone have been estimated at $3.2m for a North Sea FPSO and many companies believe that insurance premiums are likely to rise due to the number of claims now being made.

    As an attractive and flexible option which eliminates the need to lay expensive long-distance pipelines, the number of FPSOs being put into service in remote locations is rising. As such, the complexities of understanding the performance of the vessel in given sea-states and the interaction of the FPSO with the subsea infrastructure, becomes imperative.

    Marine monitoring systems have primarily been used to provide real-time information for operational support during production with typical examples of its use being: vessel position (particularly in storm conditions); information on the metocean conditions during operation; production riser tension, buoyancy and stroke and mooring line tension for failure detection.

    Furthermore, monitoring systems provide information to verify the design of the asset and provide input into fatigue calculations for mooring lines and risers. Currently, finite mathematical modeling is carried out when designing the riser configuration for the FPSO, but what is often lacking is the robust data to validate the actual local environmental conditions.  Feeding this data into the design process can help to validate the accuracy of the modeling tools being used and reduce uncertainty.

    The standard sensors and parameters that should be measured within the system include:

    •    Meteorological – the monitoring of the meteorological conditions offshore is critical to ensuring the safe operation of the asset.  In 1981, the Civil Aviation Authority (CAA) and the Helideck Certification Agency (HCA) introduced the CAP 437 standard for the U.K. Continental Shelf and currently recommends that meteorological parameters and motion of the helideck are measured for an FPSO.  Such parameters provide critical operational information which is sent back to shore so that companies planning any crew changes or helicopter operations are fully aware of the weather status on the vessel before dispatch.  Safety of employees is of the upmost importance, therefore companies want to ensure safe take-off and landing conditions

    •    Wave monitoring
    – wave induced loads are the main source of fatigue for FPSO design and wave height is a significant factor to consider for the design of the risers, as well as assessment of mooring fatigue life and hull integrity.  Recording the extreme events in storm conditions also provides valuable input to the marine forensic investigation of any offshore incident

    •    Ocean current – Surface currents can impact any offloading operations from the FPSO to the shuttle tankers and influence the response of the risers and moorings, resulting in fatigue loads 

    •    Position and attitude – measurement of the position of the FPSO is essential in storm periods to understand the vessel response to environmental forcing and the coupling of the resultant fatigue on risers and mooring lines.  The position of the vessel is also critical in the assessment of any marine incident

    •    Riser monitoring - a detailed understanding of the environmental forcing to the FPSO combined with the riser response can aid the design process and provide the input to fatigue calculations 

    •    Hull monitoring – stress induced in the deck and hull of an FPSO can be monitored using a series of long base strain gauges positioned in strategic locations on the deck and flare tower.  In addition, pressure sensors installed in the hull provide information on the vertical acceleration of the FPSO

    •    Mooring line – monitoring the mooring line is challenging and there is a scarcity of long term in-situ observed data sets for mooring line tension.  For forensic engineering and validation of design codes, it is essential that mooring line tension is collected simultaneously with metocean parameters on a common time base.

    Each of the components mentioned above are likely to involve a number of third party suppliers, therefore the challenge that oil and gas majors are faced with is ensuring they all integrate into one effective monitoring system, to provide a holistic approach and support the assets’ integrity management program.  Correct placement of the sensors on board the FPSO and full integration of the data within a common time base is vital.  By carefully setting up the sensor clocks and sampling frequency during the installation of sensors at strategic locations on the FPSO, companies can use the resultant data set to effectively study the coupled response of the vessel with the environmental and resultant dynamic loading on the risers and mooring lines to study fatigue.  

    Monitoring of all the different parameters within this common time base can also assist with forensic investigations of marine incidents.  For example, companies want to be able to match the time the mooring line broke with the highest wave that hit the FPSO.  If the clocks on the mooring sensor are different to that of the wave sensor, forensic engineers will not necessarily marry the two together.  Instead of working in isolation, the different parameters must be fully integrated to allow the root cause of the incident to be clearly identified. 

    Significant advances in technology over the last decade have meant that oil and gas majors can monitor the effect the local environmental conditions have on their critical infrastructure offshore.  Sophisticated sensors on board an FPSO can provide real time information for operational support and provide valuable input into studies on the performance of the FPSO in varying sea states.  However, to be fully effective, oil and gas companies must look at the monitoring of their critical assets holistically with the end user taking an active role in the planning and implementation of an integrated marine monitoring system.  It is vital that data is archived and stored in a common portal to allow engineers and operational teams to make the most of this valuable information. 

    Only then can they feel confident that the system is indeed fit for purpose and the risks of lost production due to repair or worse, a lengthy shut-down, are minimized.



    About the Author
    Louise Ledgard  has a P hD in Materials Engineering and Design, a Bachelor’s Degree in Applied Physics and a Masters in Business Administration.  With over 15 years’ experience working within the offshore oil and gas sector, Louise helps clients to identify an optimum solution for their offshore operational and marine engineering requirements.

    (As published in the October 2013 edition of Maritime Reporter & Engineering News - www.marinelink.com)
     

  • and currents at the site location, provides a valuable insight into the performance and possible extension of the integrity life of the asset.  Louise Ledgard, Head of Oil and Gas Business Development at BMT Group, explains that as new technology is introduced, riser design becomes more sophisticated

  • Hudson Shipbuilders, Inc. (HUDSHIP) of Pascagoula, Miss., recently delivered its fifth vessel for 1980, the 120-foot utility vessel Wanda Louise, built for Gerald P. Hebert Enterprises, Inc. of Lafayette, La. Mr. Hebert, a manufacturer of oilfield "down hole" equipment, gave special instructions to

  • Metropolitan Section of The Society of Naval Architects and Marine Engineers gathered for a recent meeting aboard the converted cruise ship Princess Louise berthed in Los Angeles Harbor. The subject of the e v e n i n g ' s technical paper, "Radar — A New Approach to Level Gauging," is as current to ship

  • A new 95-foot oceangoing tug, the Selat Siberut, built by Equitable Shipyards, Inc. of New Orleans, La., recently was loaded aboard the cargo ship Louise Lykes. The tug was built by Equitable Shipyards for the Government of Indonesia, and will be offloaded by the Lykes ship at Singapore, after approximate

  • The February Meeting of the Los Angeles Metropolitan Section of The Society of Naval Architects and Marine Engineers was held aboard the S.S. Princess Louise I. Thirty-five members and guests turned out for the occasion. The evening's speaker was Raymond E. Wallace, of Raymond E. Wallace Special Productions

  • engine will have a continuous duty rating of 850 bhp at 1,225 rpm. The new vessel was shipped from New Orleans to Singapore as deck cargo on the Louise Lykes. Equitable is a wholly owned subsidiary of Trinity Industries, Inc., Dallas, Texas, a manufacturer of industrial, marine and structural

  • The appointments of Louise Gonzales and Rosalie Castanon as assistant traffic managers for inbound and outbound freight, respectively, was announced by Capt. M.H.K. Aschemeyer, district manager in southern California for Prudential Lines. Working from Prudential's offices in Long Beach, Ms. Gonzales

  • meeting of the 86-87 season for the Los Angeles Metropolitan Section of The Society of Naval Architects and Marine Engineers was held at the princess Louise II Restaurant in San Pedro. The author, Thomas R. Junod, marine and offshore manager of Equipment Engineering Inc. of Costa Mesa, discussed the

  • A recent meeting of the Los Angeles Metropolitan Section of The Society of Naval Architects, held aboard the Princess Louise I, heard a paper entitled, "Fiber Optics for Shipboard Applications," by Donald Chambers, senior project engineer at Hughes Aircraft Company in Anaheim, Calif. Members and

  • LPG carriers, Mitsubishi Heavy Industries, Ltd. of Japan completed the world's first internally insulated LPG carrier, the Pioneer Louise. The Pioneer Louise is a large refrigerated-type LPG carrier built at MHI's Yokohama Shipyard & Engine Works for Goldcup Shipping Inc. of Liberia

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  • MR Nov-77#60 , held aboard 
the Princess Louise in Los Angeles Harbor)
    November 1977 - Maritime Reporter and Engineering News page: 60

    Los Angeles Section's Opening Meeting At the September meeting of the Los Angeles Metropolitan Section, held aboard the Princess Louise in Los Angeles Harbor, from left: Dr. Kenneth Chen, Papers chairman; M.R. Ward, author/speaker; Frank A. Kuntz, chairman; William A. Hood, vice chairman, and Lt.

  • MR Aug-78#16  to one vessel, 
the Louise Lykes of Lykes Bros. Steamship)
    August 1978 - Maritime Reporter and Engineering News page: 16

    Ace and American Lark of United States Lines Co. The four-year category of the AIMS Devlin Award included presentations to one vessel, the Louise Lykes of Lykes Bros. Steamship Co. In addition, a total of 12 ships were eli- gible for awards in the two-year category. They included the USNS

  • MR Dec-15-78#34  right, aboard the S/S Princess Louise, Capt. J.E. Kaune, USN)
    December 15, 1978 - Maritime Reporter and Engineering News page: 34

    Control El Paso Savannah Christened At Avondale Shipyards In New Orleans Joins A Fleet Of Nine LNG Tankers Left to right, aboard the S/S Princess Louise, Capt. J.E. Kaune, USN; Capt. Robert Sulit, USNR, and Julian Porter, president of Flame-Spray, Inc. The October meeting of the Long Beach-Greater

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    January 1981 - Maritime Reporter and Engineering News page: 58

    , Waukesha, Wise. 53186 EVAPORATORS Rilev-Beaird. Inc., P.O. Box 1115, Shreveport, La. 71130 EXPANDED METALS - METALS Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974 Washington Iron Works, 1500 Sixth Avenue South, Seattle, WA 98134 FANS—VENTILATORS—BLOWERS—HE ATEXCH ANGERS Coolmar

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5B LOUISE DRIVE GINKGO INDUSTRIAL)
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    write for our CONTROLLED METALS BROCHURE and our FULL-LINE CATALOG. MILLARD CONTROLLED METALS, INC. A MILLARD ASSOCIATED METAL SERVICE CENTER 5B LOUISE DRIVE GINKGO INDUSTRIAL PARK IVYLAND. PA 18974 MILL TEST REPORTS • QUALITY CONTROL MIL-I-45208A fare facility in Braintree, Mass. Analysis and

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Vessel Review 
—Wanda Louise 
(continued from page)
    January 1981 - Maritime Reporter and Engineering News page: 24

    Shallow Draft Vessel Review —Wanda Louise (continued from page 22) Twin Disc model 527 reduction gears. On sea trials the vessel exceeded 12 knots. Auxiliary pow- er is provided by two 50-kw Delco generators driven by GM Detroit Diesel 4-71 engines. Engines are monitored by a 21-point

  • MR Jan-81#22  Draft 
Vessel Review 
—Wanda Louise 
(continued from page)
    January 1981 - Maritime Reporter and Engineering News page: 22

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  • MR Jan-81#20  horn. UTILITY VESSEL )
    January 1981 - Maritime Reporter and Engineering News page: 20

    provided a Series 70 Tugmonitor system, Carlisle & Finch two xenon searchlights, and Kahlen- burg a model Q-4 air horn. UTILITY VESSEL 'WANDA LOUISE' The US.GG. says" Launch Asm!" World-renowned Schat Life Raft Davits are now approved for use on U.S. ships. Schat's Raft Launching Davits

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    January 15, 1981 - Maritime Reporter and Engineering News page: 54

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  • MR Jan-15-81#8  aboard the Princess 
Louise for a recent meeting.)
    January 15, 1981 - Maritime Reporter and Engineering News page: 8

    members and guests of the Los Angeles Metropolitan Section of The Society of Naval Architects and Marine Engineers gathered aboard the Princess Louise for a recent meeting. The evening's paper, titled "Shipboard Noise," was presented by Dr. Robert Saucedo, president of the Casde Corporation

  • MR Feb-15-81#54  
Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    February 15, 1981 - Maritime Reporter and Engineering News page: 54

    ., Tonawanda, NY 14150 EVAPORATORS Riley-Beaird, Inc., P.O. Box 1115, Shreveport, La. 71130 EXPANDED METALS - METALS Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974 FANS—VENTILATORS—BLOWERS—HE ATEXCH ANGERS Cool mar Heatexchangers B.V., P.O. Box 54156 3008 JD Rotterdam, (The Netherlands)

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    March 15, 1981 - Maritime Reporter and Engineering News page: 56

    METALS - METALS Fibergrate Corporation, P.O. Box 344610, Dallas, TX 75234 Lukens Steel Company, Coatesville, PA 19320 Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974 FANS—VENTILATORS—BLOWERS—HE ATEXCH ANGERS Coolmar Heatexchangers B.V., P.O. Box 54156 3008 JD Rotterdam, (The Netherlands)

  • MR Apr-15-81#64  
Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    April 15, 1981 - Maritime Reporter and Engineering News page: 64

    METALS - METALS Fibergrate Corporation, P.O. Box 344610, Dallas, TX 75234 Lukens Steel Company, Coatesville, PA 19320 Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974 FANS—VENTILATORS—BLOWERS—HE ATEXCH ANGERS Coolmar Heatexchangers B.V., P.O. Box 54156 3008 JD Rotterdam, (The Netherlands)

  • MR Apr-15-81#16  cruise ship 
Princess Louise berthed in Los 
Angeles)
    April 15, 1981 - Maritime Reporter and Engineering News page: 16

    Section of The Society of Naval Architects and Marine Engineers gathered for a recent meeting aboard the converted cruise ship Princess Louise berthed in Los Angeles Harbor. The subject of the evening's technical paper, "Radar — A New Approach to Level Gauging," is as current to ship

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Princess Louise, the evening)
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    . At a recent meeting of the Los Angeles Metropolitan Section of The Society of Naval Architects and Marine Engineers aboard the Princess Louise, the evening's paper titled "The Combined Ef- fect of Vertical and Horizontal Lineshaft Alignment on Main Re- duction Gear" was authored and

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5B LOUISE DRIVE GINKGO INDUSTRIAL)
    July 1981 - Maritime Reporter and Engineering News page: 3rd Cover

    write for our CONTROLLED METALS BROCHURE and our FULL-LINE CATALOG. MILLARD CONTROLLED METALS, INC. A MILLARD ASSOCIATED METAL SERVICE CENTER 5B LOUISE DRIVE GINKGO INDUSTRIAL PARK IVYLAND. PA 18974 MILL TEST REPORTS • QUALITY CONTROL MIL-I-45208A Write 428 on Reader Service Card Inboard, Inboard/Outb

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the decks of the Princess Louise. 
This session was dedicated)
    July 1981 - Maritime Reporter and Engineering News page: 16

    Metropolitan Sec- tion of The Society of Naval Ar- chitects and Marine Engineers at- tracted 60 members and guests to the decks of the Princess Louise. This session was dedicated to past chairmen of the Section and to the introduction of new officers, selected to serve for the 1981-82 season

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    July 15, 1981 - Maritime Reporter and Engineering News page: 52

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    August 15, 1981 - Maritime Reporter and Engineering News page: 48

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GINKGO INDUSTRIAL PARK 
5M LOUISE DRIVE • IVYLAND, PA 18974)
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fleet along with the Wanda Louise, 
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    class util- ity vessel, built by Hudson Ship- builders, Inc. (HUDSHIP), Pas- cagoula, Miss. The Amy Nicole joins Hebert's fleet along with the Wanda Louise, which was previously constructed by HUDSHIP, the Jackie A and the Mark Alan. The vessel is powered by twin GM 16V92 diesel engines through

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Millard Controlled Metals, 5 Louise Drive, Ivyland. PA 18974)
    October 15, 1981 - Maritime Reporter and Engineering News page: 4th Cover

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    season of the Los Angeles Metropolitan Section of the So- ciety of Naval Architects and Marine Engineers was held re- cently aboard the Princess Louise in the Port of Los Angeles. George Stiehl, incoming chair- man of the Section, opened the meeting and introduced the new officers: George

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Millard Controlled Metals, 5 Louise Drive, Ivyland, PA 18974)
    November 15, 1981 - Maritime Reporter and Engineering News page: 48

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