Case Study

3D Laser Scanning Services Case Study – Zweirzyniecki Bridge, Wroclaw Poland

The Rig Engineering branch located in Wroclaw Poland undertook the laser scanning of one of the famous landmarks of the city – the Zweierzyniecki bridge. This historic bridge spans 62 meters, 22 meters wide and 14 meters high. This bridge was design by German engineers in 1897 and is a single span arch formed truss type bridge structure interlaced with bracing with suspended deck. The Rig Engineering team utilised 23 scanning positions during the single day project to capture this grand structure and immortalise it in a 3D Colour Point cloud. The laser scanned data will be archived on Rig Engineers servers and can be made available to local Wroclaw conservatory organisation for any future requirements whether for the extraction of detailed measurements, additional design or modifications works or simply for historical records. The case study below examines the numerous possibilities and benefits for of using this method of data capture for this and similar projects.

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3D Laser Scanning Services – Service Descriptions

Rig Engineering have been deployed on numerous laser scanning projects all around the world. This can be in the North Sea, Ghana, Norway, Angola or hard to reach locations. Our range of (portable) scanners allows us to hand carry equipment best suited to logistics and job sites anywhere in the world. Details have been provided of some of the most interesting scanning projects and how we have harvested the data to give maximum benefit and accurate cost effective solutions to our clients.

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Case Study LFM Server

Project description: Typical example below, initiated by Rig Engineering for the purpose of permanent records for subsequent checking, comparison and dimensional interrogation such as in the case of the Sedco 704 BOP prior to rework. DIDON Tanker bow was laser scanned since there was no up to date as built to do detail engineering design and conversion to convert standard mooring system to Tri Catenary Mooring System (TCMS). Kitty Knutsen was laser scanned before she departed to Singaporean Shipyard to be converted to FPSO. Point Cloud data from the laser scan allowed Rig Engineering to be ahead and produce design and fabrication drawings while the vessel was en route to Shipyard. Trident 14 helideck was laser scanned for detailed modification and a feasibility study was made for relocating existing helideck to new location.

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Pressure Retaining Engineering Services

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Case Study for Civil Engineering

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Subsea Engineering Case Study

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Case Study 2865 – John Shaw BOP

Project description: Rig Engineering (RE) was tasked by Transocean Inc. (TOI) to perform structural verification of the BOP frames to assess the adequacy of the frames to support the entire stacked up weight via 4 off elephant feet instead of centrally on the test stump via wellhead connector. This assessment includes various load cases as well as splitting BOP package which in turn disrupt the load path and load sharing between the upper and lower fames. Where applicable, engineer the strengthening members to allow this operation to take place.

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Case Study 2859 Mud Gas Separator

Project description: Rig Engineering (RE) has been tasked to reassess operating limit review of existing Mud Gas Separator (MGS) located on semi-submersible drilling rig. Design reference code was ASME Boiler and Pressure Vessel, Section VIII Division I. To assist with code requirements screening the vessel was rerated using Compress software. In addition, due to vessel legs location on bottom dome end, which is not covered by the code, an additional finite element analysis (FEA) was carried out in order to assess capacity of bottom dome end when submitted to contents (solids and liquids) inside the tank.

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Case Study 2857 Deflector sheave

Project description: Rig Engineering in alliance cooperation with Enterprise Engineering Services, has been tasked by leading underwater engineering services provider, SUBSEA 7 to assist with deflector sheave project on one of their lay vessels. This assignment relates to design of deflector sheave foundation to accommodate free issued 25 Te sheave assembly. This follows with drawings package to destruct existing sheave housing assembly, new fabrication drawings to allow for the system to be shop built and ready to be shipped offshore for final bolting connection to the deck of the vessel.

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Case Study 2829 Tensioner Turn Down Sheave Strength Verification

Project description: Rig Engineering has been tasked by a N. Sea rig owner to do strength verification of turn down sheave for the riser tensioner system. The objective is to provide additional specification to optimize material technology, stress state and service temperature of the rig for the construction of replacement unit.

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Case Study 2828 Marianas Platform

Project description: Structural platform and associated walkways to take the imposed load of Weatherford Microflux Control System (MFC) inclusive of the hose loading to the slip joint, were designed, built and installed on the existing false rotary table placed on the BOP carrier in Marianas’ moon pool. Functional loadings from hose during storm conditions were assessed and used as additional design load for the proposed platform.

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Case Study for 2813 2822 DWM – Temporary Living Quarters

Project description: Rig Engineering (RE) was tasked by Transocean Inc. (TOI) to escalate preliminary design /feasibility study to install 3 off accommodation modules to conclusion. The assignment includes on location site survey, detailed design and engineering assessment leading to Class Submittal to American Bureau of Shipping (ABS). This detailed phase includes fabrication (destruct and construct), installation drawings, CG / added weight take off and acts on TOI behalf for Class Submittal to conclusion.

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Case Study 2726 Air Pressure Vessel

Project description: Rig Engineering (RE) has been tasked by one of the Drilling Contractors in UKCS to do design review on one particular air pressure vessel (APV) type of bottle for use on semi-submersible drilling unit. Design reference code is ASME Boiler and Pressure Vessel Code, Section VIII Division I, 2010 Edition.

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Case Study 2720 Flare Boom S701

Project description: Sedneth 701 required flaring off gas via flare boom and burner heads during flowing of the well. EXPRO has been selected to perform this work and will furnish a new 60 feet boom to allow for this operation to take place.

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Case Study 2715 Atlantic Rotterdam Hull Analysis

Project description: Preparation of stress analysis for No 32 Preload Tank, located on FWD side of ‘Atlantic Rotterdam’ jack-up unit, was done to reduce amount of time required for replacing corroded sections through the optimisation of repair process. No 32 Preload Tank repair was done in February/March 2011 in Remontowa Shipyard, Gdansk (Poland)

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Case Study 2687 – Crane Pedestal

Project description: Rig Engineering (RE) was tasked by a leading Drilling Contractor to undertake a feasibility study to review the recurring defective welds at the pedestal to deck and also at the pedestal to mounting flange connections. This feasibility study is to identify the stress state and what precautionary measures need to be implemented to reduce the recurrence of these In Services defective welds. RE provides global and local strength verification along with construction drawings of the required reinforcement to reduce the stress ranges at these locations that are identified by In Services inspection means and FEA route.

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Case Study 2632 Ocean Nomad – Chute Frame

Project description: Rig Engineering (RE) was tasked by XCITE Energy / Mooring Systems Limited (MSL) to undertake and provide all the necessary engineering and design services to take their feasibility study to conclusion. This feasibility study to flow the well, was done by XCITE and requires for the export hose and chute to be installed on column top of Semisubmersible, Ocean Guardian. RE provides global and local strength verification along with destruct and construction drawings of the supporting structures to accommodate all the equipments provided by XCITE Energy.

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Case Study 2615 Polar Pioneer BOP

Project description: Search out a solution to house the existing generic type wellhead connector using the same basic framework but replacing the inner core with a new bucket specifically to suit Vetco H4 with smaller diameter. In addition to this, it was requested that an option for dismantling the wellhead connector be accommodated without having to separate the wellhead spider frame from the lower main frame. Design concept consists of one horizontal supporting ring to take the loading from the connector component and this load is taken up by the diagonal framing with 4 pin connections. This is to facilitate offshore quick change out of the connector.

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Case Study 2552 PBLJ – BOP modification

Project description: Rig Engineering (RE) was tasked by Transocean Inc. (TOI) to undertake and provide all the necessary engineering and design services to redesign a new receiver plate for BOP in readiness for 2010 Shipyard. This new plate is required to accommodate new mini collet choke and kill stabs, improve load sharing between the upper and lower bucket framings and allow for the annular to be extracted from the top side of receiver plate instead of existing bottom entry and exit.

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Case Study 2542 Banana Sheave

Project description: Paul B Loyd Junior Operations Personnel and Project Team have recently done the functional review of the existing BOP pod hose spooling system. The current system is based on fixed sheave mounting installed underneath the drill floor. Although certain amount of the out plane movements of the sheave is currently being offered by the existing system, it has been concluded that better performance in spooling can be gained. Rig Engineering was tasked with providing ‘swivel’ system to accommodate variable fleet angle during hauling in and paying out of pod hose.

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Case Study 2519 – PBLJ Lifeboat

Project description: Rig Engineering (RE) was tasked by Transocean Inc. (TOI) to undertake and provide all the necessary engineering and design services to upgrade the lifeboat and davits on the FWD and AFT deck to conclusion which also include acting on behalf of TOI to get Short Form Agreement with DNV. To obtain Design Verification Report, all aspects of works such as on location site survey, preliminary design, structural assessment of the local deck and global assessment leading to fabrication and installation drawings were done and submitted to Det Norske Veritas, Oslo Norway to conclusion. Weight take off and centre of gravity revision, was done as part of the work pack prescribed by TOI.

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Case Study 2519 – PBLJ Lifeboat

Project description: Rig Engineering (RE) was tasked by Transocean Inc. (TOI) to undertake and provide all the necessary engineering and design services to upgrade the lifeboat and davits on the FWD and AFT deck to conclusion which also include acting on behalf of TOI to get Short Form Agreement with DNV. To obtain Design Verification Report, all aspects of works such as on location site survey, preliminary design, structural assessment of the local deck and global assessment leading to fabrication and installation drawings were done and submitted to Det Norske Veritas, Oslo Norway to conclusion. Weight take off and centre of gravity revision, was done as part of the work pack prescribed by TOI.

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Case Study 2518 PBLJ Crane Pedestal

Project description: Rig Engineering (R.E.) was recently tasked by Transocean to provide engineering services / support in replacing existing Port pedestal crane with a new Liebherr crane. This supports include engineering calculation, (static strength and fatigue calculation), simulation and the fabrication packages to allow for the destruct and installation of new pedestal. All the Class Society submittal was also done on behalf of TOI to Det Norske Veritas in Oslo, Norway to conclusion. Since the new 75 Te lifting capacity Liebherr BOS 2600-75D Litronic crane, has its own and different pedestal, RE was also tasked in designing a new conical transition piece to adapt the 2 different diameters together to rig side stub. A new crane boom rest was also purposely design using Liebherr’s design criteria along with Code for Lifting Appliances in a Marine Environment standards.

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Case Study 2518 PBLJ AFT Crane Boom Rest

Project description: Rig Engineering (R.E.) was recently tasked by Transocean to provide engineering services / support in replacing existing Port pedestal crane with a new Liebherr crane. This supports include engineering calculation, (static strength and fatigue calculation), simulation and the fabrication packages to allow for the destruct and installation of new pedestal . For detailed information, refer to our Case Study 2518 A Paul B Loyd Junior Port Crane Replacement. As a follow on from that Case Study, R.E. has been tasked with designing a brand new auxiliary crane boom rest to supplement the main boom rest when the crane is in normal stowed condition. Since the stowed condition of use, pose the risk of breaching the 210 sector for landing and takeoff, this auxiliary boom rest was provided for use during helicopter landing and taking off. Liebherr’s design criteria and Lloyd’s Register requirements Code for Lifting Appliances in a Marine Environment as well as Det Norske Veritas’s requirements on the strength verification, were met in full. Short Form Agreement (SFA) was raised with Det Norske Veritas and the Classs Submittal was duly done on behalf of TOI.

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Case Study 2485 Prospect – Mouse Hole

Project description: Rig Engineering (RE) has been tasked by Transocean Inc. (TOI) to check capacity of existing mouse hole. The analysis approach is generally in accordance with the requirement of the DNV-OS-C201 Structural Design of Offshore Units (WSD Method), October 2008. Load criteria used for calculations and screening have been defined based on information supplied by the client.

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Case Study 2470 Dry Tow

Project description: Dry Tow structural assessment was done for moving Sedco 700 and Sedco 709 in tandem, on board Dockwise’s Blue Marlin Vessel to repair facility in Far East. Additional assessment was also done to put Sedco 709 on repair barge on route to S Africa protected water where the Special Periodical Survey and associated repair was conducted. Operating and storm condition were checked in accordance with owner and warranty surveyor’s requirements.

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Case Study 2349 Nexen Tree Handling Skid Frame and Angel Wing

Project description: To review existing BOP trolley and provide engineering, design and fabrication drawings to allow for Nexen Christmas Tree Running Operation. Existing capability of tree and BOP handling are to coexist and with least amount of alteration to allow for the vertical and horizontal tree running operations. For this project, existing trolley was sent in from offshore and the As Built has been measured and put in to CAD as starting off point. Then FEA model was made for subsequent stress state checking throughout the entire tree running and retrieving process including the accidental condition when the tree is supported while angel wings act as free cantilever with full dynamic amplification factor 0f 1.5G and 0.5G vertical and horizontal respectively. Recommendation and improvement to the system has been dispatched to enhance the functionality and ensure safe operations.

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Case Study 2188 Monarch Skid Beam Scatling

Project description: Some deformation was found on the AFT drill floor skid beam on the Monarch. The underlying cause and the time frame that caused this permanent deformation were not known. Early indication from Operations suggested that this may have been formed at the time that the rig was suffering from the effect of scouring. However, there was no incident report available to confirm or give out the detailed information of this phenomenon.

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Case Study 2112 BOP modifications

Project description: Preparation of strength verification for existing BOP frame for critical operating conditions. It was noticed that during pressure testing the connection between receiver plate and stab plate was not hermetic. Rig Engineering was tasked to investigate the reason for the damage and to propose strengthening that would prevent loss of pressure in future. Any departure from the rule was to be reported.

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Case Study 2103 Trident IX Global Strength Analysis

Project description: Jack-up global strength analysis was prepared to demonstrate that after accounting for wasted areas the jack-up hull is structurally adequate to withstand the maximum survival environmental criteria noted in the Operating Manual.

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Case Study 2101 – Jack-Up Unit Helideck Strength Verification

Project description: Rig Engineering (R.E.) was tasked by a leading drilling contractor to carry out strength verification of existing helideck located on jack-up drilling unit. The finding was used to guide the wall thickness gauging technician to do a thickness evaluation and assess the overall integrity of the helideck ahead of class inspection.

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Case Study 2066 JW McLean

Project description: Global steel wastage effect on stability column was evaluated with respect to remaining column buckling strength. Additional strengthening of column was specified and carried out on location to bring the allowable stress to within class rule requirements without immediate cropping and renewal of wasted steel.

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Case Study 2060 Arthit

Project description: Conversion of conventional tanker in to Floating Production Facility by installing patented Tri Catenary Mooring System (TCMS) and export riser facility at the bow. TCMS system is based on Mooring Systems Limited. (MSL)

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Case Study 2042 2425 Strengthening of Wasted Truss

Project description: Rig Engineering (RE) was tasked by a leading Drilling Contractor to undertake a feasibility study to quantify the potential candidate means of reinforcing leg truss. This feasibility study is to identify the stress state and what precautionary measures need to be implemented should the needs arise to drill in harsher environment, increased water depth or the effect of corrosion on the truss members which are made of long lead Branded Steel material. RE provides global and local strength verification along with construction drawings of the required reinforcement to accommodate this eventuality for the risk assessment / emergency procedural purpose.

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Case Study 2003 Didon

Project description: Conversion of conventional tanker in to Floating Production Facility by installing patented Tri Catenary Mooring System (TCMS) and export riser facility at the bow. TCMS system is based on Mooring Systems Limited. (MSL)

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