Structures American Innovations, LLC (SAI Engineering) is a specialty structural engineering firm that has roots spanning more than 45 years. The company is owned and operated by brothers Brock Ring, PE, and Brantlon Ring, who acquired the company in January 2026. We’re committed to maintaining the strong reputation this firm has built for technical excellence and practical solutions. It is our mi
ssion to carry this company forward for decades to come and make sure SAI stays a reliable name in structural engineering. Before that, SAI Engineering was owned and operated by Syam Mannava, PE, SE, who remains actively involved as the Principal Structural Engineer. Mannava grew the firm’s capabilities while also expanding operations through the establishment of a dedicated office in India, staffed by an experienced team of engineers and drafters. The firm traces its origins to 1977, when Garland Pendergraf, PE, founded Pendergraf Engineering. Syam Mannava joined in 1996 and later purchased the company in 2007, forming SAI Engineering. We have worked extensively in Oklahoma as Structures America Innovative Engineering, PLC since August 2006 and as Pendergraf Engineering, PLC until August 2006, with many other projects in Alabama, Arizona, Arkansas, Colorado, Florida, Georgia, Iowa, Illinois, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Nevada, New Mexico, North Carolina, Ohio, Pennsylvania, South Carolina, South Dakota, Texas, Utah, Virginia, West Virginia and Wyoming. We work as either sub-contractor to architects or contractors, or as the prime design professional for the project. We belong to the Structural Engineering Council of Oklahoma (SECO) and Oklahoma Structural Engineers Association (OSEA) along with several other professional organizations. We strive to constantly update our knowledge through continuing education to better serve our clients. Our structural designs for buildings have ranged from a million dollar Bank Building, to a 5 million dollar 3-story Hospital, to a 7 million dollar Auditorium-Gymnasium, to a 10 million dollar Aircraft Maintenance Facility, to a 12 million dollar 4-story office building, to a 52 million dollar 300,000 SF High School Building. We also designed 2 to 3 million dollar Large Residential Buildings ranging in size from 6,000 to 11,000 square foot. We are equally comfortable designing and detailing with structural steel, light gage metal, tilt-up or cast-in-place concrete, or wood. We use current up to date computer programs to aid us in engineering and drafting. We have a professional dedicated staff structural engineers in Oklahoma that are highly qualified with advanced degrees in engineering both at our US and Indian offices that works hard to meet the clients and project requirements and deadlines, while complying with the building codes. We pride in ourselves being easy to work with. We offer structural engineering services in Oklahoma and other states comparable to the best in the industry and stand by our clients from conception through successful completion of all the projects. Please feel free to contact any of our clients shown on our attached list of projects or on the list of references. Our specialty includes designing and detailing with many different structural materials such as structural steel, light gauge metal, tilt-up, cast-in-place concrete, wood, etc. We use sophisticated computer programs to aid our engineering and drafting, that we keep up to date with the current technology. We stay current with the latest developments in the field of structural engineering through our membership and participation in professional organizations such as American Consulting Engineers Council (ACEC), Structural Engineering Council of Oklahoma (SECO), Oklahoma Structural Engineers Association (OSEA), and American Concrete Institute (ACI). We are currently licensed to practice in Oklahoma, as well as 36 other states that include all of the surrounding states of Oklahoma. We have worked extensively in Oklahoma, with many other projects in many other states. See above for a complete listing of the states in which we are licensed.
