Jack-Ups, Liftboats, Compliant Structures
CE Marking Consultancy and Declarations of Conformity
Finite Element Analysis, Dynamic and Nonlinear
Marine Training Simulators, Emergency Preparedness
Floating Process Equipment Design & Slosh Minimization


Stewart Technology Associates (STA) founded in 1986, provides a wide variety of services in the offshore and marine industries. STA undertakes structural dynamic and hydrodynamic analysis of many structures and systems using a variety of technology software tools. Orcaflex is generally the software of choice for riser design and riser analysis, mooring design and mooring analysis, single point moorings top tensioned risers, flexible risers, drilling and production risers, steel catenary risers and cable dynamics problems in general. STA has worked with Orcaflex and Orcina since 1986. Read more about Orcaflex >>

Liftboat Design...

STA provides jack-up analysis and jack-up design and review services. The Irish Sea Pioneer, a 4-legged jack-up was designed by STA in 1996 and built at Bollinger Shipyard, Louisiana, for Halliburton. This vessel now works the Liverpool Bay Project, UK. STA developed a jack-up analysis program, STA JACKWAVE, beginning in 1987. STA LIFTBOAT is a similar program used by liftboat designers for preliminary design of liftboats. The US Coast Guard also use it for liftboat design reviews. STA has proprietary software and designs for marine training simulators used for improving emergency preparedness of crews on jack-ups, semi-submersibles, and liftboats. STA now helps US clients with CE marking in conformance with the 98/37/EC Machinery Directive. Read more about Liftboat Design >>

Expert Witness Marine...

Mr. Stewart has acted as an expert witness on many occasions, providing expert testimony associated with marine accident investigation, mooring failures, riser failure, single point moorings, liftboat design, anchor analysis, pile anchors, anchor failures, suction pile failures, cable dynamics, seakeeping analysis, and marine collisions and capsize. An interesting expert witness marine litigation case involved a bottom-founded barge that capsized while resting on-bottom of a lake in relatively benign environmental conditions. This case involved an understanding of naval architecture, mechanical technology and geotechnical technology, all contributing to an unusual stability failure. Read more about Expert Witness Marine >>

Marine Renewable Energy...

STA clients have been increasingly interested in renewable energy, particularly from offshore fixed and floating wind farms, in-stream hydrokinetic devices and wave energy converters. The ASCE COPRI Marine Renewable Energy Committee was formed in 2009 and Bil Stewart was appointed Chairman.  The MRE Committee has been producing a new document for Civil Engineer involved with MRE projects.  An extract from the Table of Contents is shown below: STA has assisted clients with wind farm installations using liftboats, jack-ups and crane barges. STA has used Orcaflex for design and analysis of wave power systems, and proprietary tension-leg platform-mounted wind turbines. Read more about Marine Renewable Energy >>

William Stewart

CEO, Stewart Technology Associates See Resume...

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