STA Capability Sheet 1 Stewart Technology Associates About the Company Stewart Technology Associates (STA) is an international engineering consultancy specializing in offshore and marine structures. STA was founded by Bil Stewart in 1986 and is based in Houston, Texas. Prior to forming STA Mr. Stewart was Vice President of Dn. V in the USA, responsible for all technical work of the Society in the USA. STA has a wide range of clients from around the world, including major oil companies, drilling contractors, other engineering companies, government agencies, and financial institutions. Our company and our associates have extensive offshore experience in a multitude of engineering disciplines. This experience coupled with STA’s vast arsenal of state of the art engineering software and 2000 book technical library enables us to provide our clients with cutting edge engineering services. About Our Engineering Services Specific services where we have special experience and expertise include: Ì Structural Design with Non-linear & Dynamic Finite Element Analysis Ì Hydrostatic Stability Ì Liftboat Design & Analysis Ì Jack-up Elevated & Afloat Stability with Site Specific Analysis Ì Marine Training Simulators for Semi-Submersibles, Jack-ups & Liftboats Ì Hydrodynamic Response Analysis w/Diffraction/Radiation Software Ì Mooring Design & Analysis Ì Flexible Riser and Umbilical Design & Dynamic Analysis Ì Expert Testimony Services Ì Naval Architecture Services Ì Tensioned Riser Dynamic Analysis Services Ì Vortex Induced Vibration Analysis Ì Pile and Drag Anchor Design and Analysis Ì Cost Estimation for Offshore & Onshore Field Development Ì Risk Analysis for Offshore Development Ì Software Development Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 2 STRUCTURAL DESIGN & ANALYSIS Stewart Technology Associates has experience with a wide range of Finite Element Programs including NISA, our basic in-house package, SESAM (Dn. V), ASAS (Atkins, UK), Algor, ANSYS, NASTRAN and STRAN. Our general approach to structural design and analysis work is to solve fundamental structural behavior from as simple a technique as possible, backed up where necessary with finite element analysis. We specialize in dynamic and non-linear structural behavior, generally linked with hydrodynamic loading. Large numbers of “standard” problems are solved semi-automatically with in-house developed applications using Mathcad, Excel and other software packages. We have worked on most types of offshore structures including fixed platforms, TLPs, jack-ups, semi -submersibles, barges, drillships, buoys, pipelines, risers, moorings, anchors, and foundations of many types. Colors denote different plate thickness’ in FE models. Jackhouse Cut-Away Finite Element Model of Four Leg Liftboat Selected Structural Projects Ì Ì Ì Structural Design of the World’s Largest Liftboat for Bollinger Shipyard and Halliburton Analysis and Design Modifications to Several Liftboats Analysis and Site Specific Evaluation of Numerous Jack-ups Analysis and Type Approval for Dn. V of Several Braden Winches Analysis and Design Modifications to Freedom Space Station Mock-up for NASA Design of A-Frame Structure for Research Vessel Arctic Discover Fatigue Analysis of CFEM Jack-up Rig Spud Cans for Global Marine Drilling Co. Buckling Failure of Barge for Commercial Marine Services Torsional and Lateral Vibration Analysis of Pump and Gearboxes for US Army Forensic Analysis of Articulated Navigation Aid Failures for US Coast Guard Development of Structural Analysis Requirements for Liftboats for US Coast Guard Design of Numerous Pile and Plate Anchors for US Navy Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 3 HYDROSTATIC STABILITY Stewart Technology Associates (STA) performs frequent stability analyses, often using GHS software, from Creative Systems. Stability booklets and operating manuals can be produced and computerized versions of variable load forms are often provided. Customized applications, designed to be run on-board, for load and stability monitoring while vessels are in service are specialties of STA. Hydrostatic stability evaluations of jack-ups and liftboats going onto location involving leg interaction with the seabed enable planning of optimized pre-load operations. Hydrostatic Model of Three Leg Liftboat Hydrostatic Model of Four Leg Liftboat Selected Stability Projects Ì Ì Ì Ì Ì Stability Analysis of the World’s Largest Liftboat for Bollinger Shipyard and Halliburton Load and Stability Program for Semi-Submersible for Reading & Bates Development Co. Afloat Stability and Capsize Analysis of Numerous Three Legged Liftboats Afloat Stability Analysis of CALM Buoy for SPM System off Ivory Coast for Care S. A. Afloat and On-Bottom Stability Analysis for Capsize Investigation of Posted Drilling Barge Load and Stability Program for Jack-up Rig for Japan Drilling Company Comparison of Afloat and Elevated Stability of Four Liftboats for Shell Offshore, Inc. Afloat Stability Analysis and Model Tests for Capsize Investigation of Liftboat Stability Booklet and Engineering of Dynamic Positioning System for Ocean Research Vessel Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 4 LIFTBOAT DESIGN & ANALYSIS Stewart Technology Associates (STA) has specialized in structural analysis, structural design and all important afloat stability analysis aspects of liftboats. The work began in 1989 when STA was commissioned by the US Coast Guard to produce guidelines for the structural analysis of liftboats. STA has been involved with analysis, design modifications, and full design of numerous liftboats for operations in US waters and overseas, subject to US Coast Guard, ABS, UKHSE, and other regulatory requirements. STA LIFTBOAT, a program for liftboat design review is used by the US Coast Guard as their standard tool for liftboat License approval. Halliburton’s Irish Sea Pioneer New Generation Liftboat for Harsh Environment Leg Length = 240 ft Hull Length = 181 ft Hull Width = 92 ft Electric Jacking System with infinite speed control Selected Liftboat Design & Analysis Projects Ì Ì Ì Ì Structural Design of the World’s Largest Liftboat for Bollinger Shipyard and Halliburton Analysis and Design Modifications to a Class 150’ Liftboat for Bollinger Shipyard Investigation of Pad Sliding on Seabed for Four Leg Liftboat for Halliburton Energy Serv. Analysis and Redesign of Legs for a Class 180’ Liftboat for Semco/Power Offshore Serv. Comparison of Afloat and Elevated Stability of Four Liftboats for Shell Offshore, Inc. Development of Structural Analysis Requirements for Liftboats for US Coast Guard STA LIFTBOAT - Program for Analysis and Design of Liftboats Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 5 JACK-UP AFLOAT & ELEVATED STABILITY ANALYSIS Stewart Technology Associates (STA) has analyzed and assisted with design modifications for numerous jack-ups of many different designs, including, units with independent leg supported units, and other unique designs. The program STA JACKWAVE was originally developed in 1987 for the site specific evaluation of jack-up rigs. This program is continuously evolving. It is used by marine warranty surveyors, drilling contractors and engineering companies. It has been applied on behalf of oil companies to jack-up rigs world-wide. For detailed design work STA uses it’s own software as well as FE analysis and GHS for stability analysis. STA is familiar with most classification society and regulatory agency requirements for jack-up rigs. Selected Jack-up Projects Ì Ì Ì Ì Ì Development of Software for Avoidance of Damage During Jack-up Rig Punch-Through Fatigue Analysis of Two Jack-up Rigs for Western Mining Corporation FE Analysis of Cans and Global Performance Analysis of CFEM Rigs for Global Marine Site Specific Analysis of Jack-up Rig off South American Coast for Diamond M Drilling Co. Performance Analysis of a Modified Jack-up Rig for Diamond M Drilling Co. Performance Comparisons for Jack-up Rigs at Locations in Gulf of Mexico for Texaco Inc. Structural Analysis to Support Upgrade of Jack-up Rig Capabilities for Mathews-Daniel Co. Forensic Analysis into Leg Damage During Transit of Jack-up Rig for Pool Drilling Co. STA JACKWAVE - Program for Site Specific Analysis of Jack-up Rigs Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 6 MOORING DESIGN & ANALYSIS Stewart Technology Associates (STA) has designed numerous mooring systems for offshore, coastal, inland waterway, commercial and naval operations. Projects include single, two point and spread moorings for single vessels, tankers in tandem, and multiple vessel moorings. Analysis tools include, the Atkins AQWA suite, ORCAMOOR, ORCAFLEX, BOMOOR, STA SPM, STA CATENARY, NISA and other specialized software applications for determining wind, wave and current loads. STA is familiar with API, ABS, Lloyds, Dn. V, NMO, and other regulatory authority requirements for mooring system design criteria. STA has also specialized in anchor performance prediction. Mooring System for 30 Inactive Nuclear Submarines Selected Mooring Design & Analysis Projects Ì Ì Ì Mooring Analysis for Semi Operating in Caspian Sea (1500 ft depth) for Santa Fe SPM System Design and Analysis Located off Ivory Coast, West Africa for Care S. A. Mooring Analysis for Semi Operating off Coast of Brazil (3300 ft depth), Global Marine Mooring Analysis for Semi Operating off Shetland Islands (1800 ft depth), Global Marine Analysis of Mooring Line Forces Between Drillship and Moored Barge for Sonat Offshore Single Sided, Pier Mooring System for US Navy Tanker (Wichita) Design & Analysis of Mooring System for 30 Inactive Nuclear Submarines for US Navy Design & Analysis of Two Point Mooring System off Coast of Honduras for US Navy Design of Spread Mooring System to Accommodate One Aircraft Carrier or 20 Frigates Analysis of Causes of Anchor Chain Failures During Deployment in Deep Water Design of Pile Anchors for Nuclear Submarine Tender Mooring System Design of Numerous Plate and Pile Anchors for Various US Navy Mooring Systems Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 7 FLEXIBLE RISER & UMBILICAL DESIGN & ANALYSIS Stewart Technology Associates (STA) is well known for dynamic analysis of flexible marine systems including risers, umbilicals, electric cables and mooring lines of steel and synthetic materials. Design and analysis of steel catenary risers. Projects have included design of flexible risers for production in 1135’ water depth and in water as shallow as 60’. Umbilicals have been dynamically analyzed in water depths up to 3300’ for applications now installed in Brazil. In service degradation of flexibles has been performed and the results have been confirmed by comparison with full scale tests. STA’s riser and umbilical software library includes ORCAFLEX, ORCAHOSE and design optimization software FLEXOPT. far position near position Riser Analysis for West Linapacan Field 1135 ft water depth • close liaison with clients • explicit explanation of design premises • full explanation of geometry optimization techniques • understanding of degradation processes and implications • close cooperation with manufacturers of bend stiffeners • ability to predict stresses in wires, between layers, and in polymeric materials • exceptional understanding of manufacturing processes • offering the difference between minimum capital investment and life cycle costing Selected Flexible Riser and Umbilical Design & Analysis Projects Ì Ì Ì Dynamic Analysis of ISU Umbilical in 870 ft of Water for Kvaerner FSSL, Inc. Steel Catenary Riser Installation Feasibility Study in 2945 ft of Water for Shell Offshore Dynamic Analysis of 6. 5” Umbilical Located in 2100 ft of Water for Oceaneering-Multiflex In-Service & Installation Analysis of 4” Umbilical in 1000 m of Water for Multiflex, Inc. Design of Numerous Umbilical Bend Stiffeners for Oceaneering-Multiflex Dynamic Analysis of 4” Flexible Risers in 1135 ft of Water for West Linapacan Field Dynamic Analysis of 7. 7” & 5. 5” Umbilicals in 275 ft of Water for Multiflex, Inc. On-Bottom Stability Analysis of 7. 7” Umbilicals for Wanaea & Cossack project Degradation Analysis of Umbilicals in Operating Water Depths of Up to 1000 m Degradation Analysis of Foinaven Umbilicals for BP Ultimate Strength Analysis of Coflexip Pipes for Mobil Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 8 MARINE TRAINING SIMULATORS Stewart Technology Associates (STA) offers complete design and manufacture of: Ì Ballast Control and Mooring simulators Ì Jack-up Simulators with Punch-Through Simulation Ì Liftboat Simulators The full systems include control panels, console and control room, all mounted upon a hydraulic tilting platform, simulating motions and large inclinations of list and trim. In 1982, Bil Stewart, while he was at W. S. Atkins, Inc. , designed the prototype ballast control and mooring simulator used by Dn. V in Houston for several years. STA built the world’s first jack-up simulator for Dn. V and a second simulator for Aberdeen College. In 1992, STA produced a modification for the Dn. V unit to permit the simulation of liftboats with hydraulic jacking systems. STA has maintained the Diamond Offshore Simulator for the last few years and has produced a PC version of the software. Ballast Control Panel For Semi-Submersible Training Simulator Projects Ì Ì Ì Computer Software and Hardware Upgrade of Diamond Offshore Semi-Submersible Training Simulator Design, Construction, and Installation of Liftboat Training Simulator for Dn. V Design, Construction, and Installation of Jack-up Training Simulator for Aberdeen College Design, Construction, and Installation of the Worlds First Jack-up Training Simulator for Dn. V Design and Construction of the Prototype Atkins Ballast Control and Mooring Simulator Used for a Decade by Dn. V in Houston. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 9 EXPERT TESTIMONY SERVICES Mr. W. P. (Bil) Stewart, P. E. , President of Stewart Technology Associates (STA) has provided expert testimony in many marine and offshore litigation cases. These cases have involved vessel collisions, vessel sinkings and groundings, vessel capsizes, production platform toppling, barge buckling, major structural damage to jack-ups under tow, jack-up elevated failures, anchor failures, and mooring system failures. Mr. Stewart has provided expert opinions for cases in the United States, in the United Kingdom, and in South Africa. He is a registered Professional Engineer (Texas) and a Chartered Engineer in Europe. Numerous technical papers and articles have been written by Mr. Stewart, who is also closely associated with the activities and research undertaken by several learned societies, particularly the Society of Naval Architects and Marine Engineers, and the American Society of Mechanical Engineers. A broad background in Civil Engineering, Soil Mechanics, Hydrodynamics, Offshore Structures and Structural Dynamics, Mechanical Engineering and Naval Architecture, enables STA to provide a wide and well balanced service to lawyers. Many legal cases, especially those involving forensic examination of accidents, require knowledge and experience spanning several of the above technical disciplines. STA produces high quality technical reports including clear diagrams which enable the technical analyses to be easily understood. Extensive use is made of computer software and state-of-the-art analytical and simulation techniques. Almost invariably a color “notebook” computer and printer accompany Mr. Stewart when he attends (or provides) depositions, visits clients’ offices, or simply travels out of town. With this computer, reports can be immediately modified, new analyses performed, existing analyses revised, and hard copy provided anywhere in the world, offshore and onshore. Technical reports produced by STA have won clients millions of dollars over the last fifteen years. In addition to a wide range of technical analysis software, STA maintains computer databases of offshore and marine accidents, tanker oil spills, plus databases of construction and other offshore costs. These, and other databases, can be most useful in maritime litigation. STA also produces graphic visual aids and physical models for use at trial. Expert testimony work is a small but important part of the normal STA workload. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 10 LOAD AND STABILITY CUSTOM SOFTWARE STA SEMI is a load and stability program, customized for each rig on which it runs. If required, the printed output can exactly mimic the normal variable load form contained in the Operations Manual for the rig. The completion of a single “run” of the program takes just a few minutes. The software is used offshore by personnel responsible for rig stability and weight reports. The program generates weight reports, performs stability calculations, and has many graphical features. The load and stability software was written in the Microsoft Windows environment and contains data, as listed below, which the normal user never needs to change: Ì Allowable KG for three main operating modes and transitional ballasting, Ì Hydrostatic Table, Ì Tank Sounding Tables, Ì Mooring Line Catenary Table, Ì Chain Amount Table, Ì Deck Crane Corrections. Typically the above data is taken from the Marine Operations Manual. Alternatively STA can develop the data independently. The program can be integrated with mooring and riser tension measuring systems, if required, or can be stand-alone. STA SEMI software runs on the Amoco Liuhua FPS. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 11 TENSIONED RISER DYNAMIC ANALYSIS SERVICES Stewart Technology Associates (STA) is well known for dynamic analysis of tensioned drilling and production riser systems. STA provides riser design, design optimization, and analysis services, including optimizing buoyancy can locations in order to minimize both vortex induced vibration (VIV) response, and top tensioner requirements. STA also designs and analyzes steel catenary risers, flexible risers, umbilicals, ISUs, electric cables, and mooring lines of steel and synthetic materials. STA’s riser software library includes ORCARISER, ORCAHOSE, NISA, and STA VIV. STA will provide operating strategies to cope with combined mooring system and riser management, as illustrated in the picture above, using: Ì Time-domain dynamic riser analysis Ì Transient mooring analysis with line break Ì Planning for line length adjustments Ì Strategies for optimum riser management Constraints for tensioned risers include: Ì Bottom ball joint angle Ì Loading on wellhead Ì Slip joint travel Ì Tensioner loads and stroke Ì Ultimate strength considerations Ì Fatigue, especially with VIV Ì Emergency hang-off Clients for our riser design and analysis services include Santa Fe Drilling, BP, and others. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 12 PILE, PLATE, SUCTION, AND DRAG ANCHOR DESIGN AND ANALYSIS Stewart Technology Associates (STA) offers design services and specialized analytical tools for marine anchors of all types. STA has been at the forefront of anchor research for the last nine years. The computer program STA CHAIN, for calculating the geometry and tension distribution of the anchor chain in the sea bed, was developed for the US Navy in 1988. The computer program STA ANCHOR, for the prediction of drag anchor embedment and holding capacity, was first released in 1991. Programs STA PILE, and STA PULLOUT are for design of pile anchors and plate, or VLA (Vertically Loaded Anchors), respectively. The latest version of STA ANCHOR (released in 1995) has been calibrated for the new generation of VLAs. Collectively, these computer programs enable engineers to design and analyze a wide variety of anchor systems. Analytically it can be shown that conventional modern drag embedment anchors will resist large amounts of uplift in soft soils. This has been demonstrated with full scale and centrifuge tests. Although regulatory agencies are reluctant to accept conventional drag anchor designs which incorporate uplift at the sea bed, it has been demonstrated that such uplift is tolerable and, especially in deep water, enormous cost savings can result. STA ANCHOR contains a library of standard anchor sizes and detailed geometries. The program permits the user to edit these geometries and to specify the sea bed soil strength profile (which may be stepped). The maximum anchor capacity is predicted using a novel force-moment equilibrium method, accounting for geotechnical forces on both the anchor and the forerunner buried in the sea bed. The user may specify any uplift angle at the surface of the sea bed. STA PILE incorporates suction embedment calculations, as well as standard anchor pile design calculations for multi-layered soils. Relevant Publications Stewart, W. P. , True, D. , Jones, T. , Deep Embedment Plate Anchors, OTC 5732, Offshore Technology Conference, Houston, May 1989. Stewart, W. P. , Drag Embedment Anchor Performance Prediction in Soft Soils, OTC 6970, Offshore Technology Conference, Houston, May 1992. Dunnavant, T. W. , Kwan, C-T, T. , Centrifuge Modeling and Parametric Analyses of Drag Anchor Behavior, OTC 7202, Houston, May, 1993. Fulton, T. M. , Stewart, W. P. , Vertical Loads on Drag Embedment Anchors, OTC 7491, Offshore Technology Conference, Houston, May 1994. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 13 TANK DYNAMICS, SLOSHING & SEPARATORS Stewart Technology Associates (STA) is well known for dynamic analysis. STA can provide basic knowledge of fluid behavior in enclosed containers subject to dynamic excitation. Examples include partially filled pre-load tanks on jack-ups in punch-through situations, sloshing loads inside partially filled tanks in ships, three phase flow in separators, sloshing in separators on floating production vessels. Sloshing mode shapes of rectangular tank using CFD – agreement with theoretical solutions. Dynamic sloshing in ship tank with different baffles port and starboard. Three phase flow above, shows the volume fractions of gas, oil and water in a separator. Vertical baffles in a separator subject to vessel motions are shown to the lower left. They reduce water over-topping the weir, but significantly increase oil/water mixing upstream of the weir. STA is researching improved anti-sloshing devices in separators using special vane technology patented by a partner company in the UK. This partner company is specialized in physical scale model testing of flows in separators. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 14 SINGLE POINT MOORING ANALYSIS Stewart Technology Associates (STA) offers design services and specialized analytical tools for Single Point Mooring (SPM) systems. The program STA SPM, running in the Microsoft Windows environment, is an initial screening tool for assessing tanker loads and fishtailing stability at SPMs. The first version of the program is static, while Version 2. 0 will include dynamics of tanker motions in response to wave drift forces, first order wave motions, and wind gust spectra. Dynamic yaw (fishtailing) responses will also be modeled. STA SPM offers the user a selection of standard tanker sizes and allows the user to edit these sizes, if required. The user specifies the environment and the program automatically calculates wind, wave and current forces on the moored vessel for any angle of attack. An equilibrium condition is found in a few seconds, using iterative calculations, and displayed to the user, together with hawser tensions (or turret loads) and environmental loads on the vessel. Tandem tankers may be analyzed. STA designed the Lion Field CALM system now installed off the Ivory Coast. For more detailed analysis of SPM systems, STA offers the AQWA suite of hydrodynamic software from WS Atkins, in the UK. AQWA, a 3 -D diffraction/radiation program with time domain simulation, is the most widely used program in Europe for evaluating wave forces and motions of floating (and fixed) offshore structures. In the USA, the software is used by: • US Navy • Imodco • David Tein Consulting Eng. • AC Mc. Clure Associates • as well as by STA. The Windows version of AQWA will be available in 1997, with many new features. Current features include: • 3 -D Diffraction/radiation • Full added mass determination • Full radiation damping terms • Wave spectra • Wind spectra • Time & frequency domains • Interaction between vessels • Extreme (non-linear) waves • Coupled tether/structures • Coupled vessels • Natural frequency evaluations • Hydrostatic stability • Hydrodynamic stability The AQWA suite is sold in modules. Call STA for prices. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 15 DOWNTIME ANALYSIS FOR DRILLING VESSELS STADOWN 2 is a downtime analysis program developed for Chevron Petroleum Technology. It is extremely fast and easy to use. The program predicts the days per year of downtime for different drilling vessels based upon different drilling activities being limited by different vessel motions, or wind conditions. Twenty four, or more, activities involved in drilling and/or completing a well are defined by the user and a duration for each activity is specified. The user specifies limiting criteria for each activity. Based upon the annual environmental joint probability statistics of wind and waves, together with vessel motion RAOs, as well as options for DP or spread moorings, the program computes the downtime for that specific geographic location and drilling vessel. Data for four vessels and one geographic location are contained in each copy of the program. The user can have multiple copies of the program with numerous different locations and vessels. Versions of the program can be customized for floating production operations, where vessel motions may cause production downtime, for example due to sloshing in production systems. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
STA Capability Sheet 16 PERSONNEL RESOURCES Stewart Technology Associates (STA) provides high technology engineering consultancy using a mixture of extremely experienced personnel and younger very bright engineers. Examples of STA key personnel are provided below. WP Stewart, PE, C. Eng, President: Background - 27 years experience in civil, structural engineering, naval architecture, with emphasis on structural dynamics, marine hydrodynamics, soil mechanics, offshore field development strategies, development of novel structures. Specialties include design and analysis of almost all types of offshore structures, mooring and anchoring systems, dynamic risers and umbilicals, marine training simulators, fluid dynamic simulations and physical scale model testing. Vice President of DNV in USA before founding STA in 1986. N Starsmore, C. Eng, Ph. D, Senior Associate: Background - 26 years experience in offshore engineering, with emphasis on structural dynamics, aerodynamics and hydrodynamics. Specialties include software development, data acquisition, numerical modeling techniques for wind, wave and current forces on ocean structures, computer graphics, and marine training simulators. Dr. Starsmore is an STA Associate, based in England. WT Jones, PE, Ph. D, Senior Associate: Background - 40 years experience in mechanical and offshore engineering, with emphasis on structural dynamics, marine pipelines, risers and wellhead equipment. Specialties include pipeline and dynamic flexible riser soil interaction, vortex induced vibration response, software development for design optimization of flexible riser systems, pipeline design and installation, and subsea riser and pipeline handling operations. Dr. Jones is an STA Associate, based in Houston. Most STA technical personnel are authors of technical papers in many areas of offshore technology, and all personnel are skilled in a wide range of computer applications. In addition to technical personnel, STA has skilled clerical and computer aided drafting personnel. STA has produced animated photo-realistic videos for clients, based upon detailed Autocad 3 -D drawings of complex structures and production systems. STA is also able to draw upon the resources of four UK engineering companies, each represented by STA in the USA: Orcina Consulting Engineers, Zeta Dynamics Ltd. , WS Atkins, and SAIC Andrew Palmer and Associates Division. STA has close working relationships with MARSCO and with Sage Engineering, geotechnical engineers in Houston, and with numerous other consultants and associates, worldwide, providing special capabilities in process equipment design and process simulation, electronic systems, and hydraulic systems. Mr. D. Findlayson, in Scotland, provides offshore marine training services based upon STA software and simulators. STA has close ties to universities in the United States and in the United Kingdom in the areas of fluid dynamics, geotechnics, and structural dynamics. Should you like to learn more about our company and our capabilities please give us a call at (713) 789 -8341, FAX at (713) 789 -0314, or Modem at (713) 784 -3951 Internet Address: stewart@neosoft. com. STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
Stewart Technology Associates Engineering Services and Software Stewart Technology Associates (STA) provides engineering services for all types of coastal, marine and offshore structures, including fixed steel jackets, TLPs, semisubmersibles, jack-ups, liftboats, barges, ships, pipelines, risers of all types, umbilicals, buoys, moorings, anchors, foundations and other novel marine structures. STA has specialized in fluid dynamics and structural dynamics since its founding in 1986. Analyses of motions of floating structures, flexible risers and fluids inside enclosed vessels are undertaken daily. STA provides technical and commercial risk assessments to underwriters, insurance companies, banks, and financial institutions. This service is generally for large multimillion dollar offshore projects. STA sells and supports software from other companies, including: ORCINA - dynamic and static analysis of marine flexible systems ATKINS - hydrodynamic analysis of fixed and floating marine systems SAIC (Andrew Palmer Associates) - submarine pipeline design and analysis In addition to the above software, STA builds and maintains custom software packages for clients, worldwide. STA offers specialized software for jack-ups, liftboats, anchors, and other marine structures, which are used in-house and by clients worldwide. STA provides training services to clients in many aspects of engineering and operation of marine structures. STA designs and constructs full-sized marine training simulators. Should you like to learn more about our company and our capabilities please give us a call: Phone: (713) 789 -8341, Fax: (713) 789 -0314, or e-mail to info@stewart-usa. com 5619 Val Verde, Houston, TX, 77057, USA STEWART TECHNOLOGY ASSOCIATES STRUCTURAL, MARINE & OFFSHORE SPECIALISTS
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