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© 2019 Houston Integrity Consultants LLC

Technology Transfer

Technology Transfer

Our History

Houston Integrity Consultants were originally formed as Three Rivers Systems Development Company in 1991 by John and Joel Tischuk. In 2012, Three Rivers Systems Development Company were rebranded as Houston Integrity Consultants, and we continue to develop and maintain the T-OCA software system for risk based inspection, as well as conduct RBI studies on behalf of clients around the world.


T-OCA has a long heritage, beginning in 1988 as a method of analysis for improving the efficiency of inspection programs. This pioneering work was done with BP Chemicals Grangemouth, Scotland plant. A change in British regulations at that time required that all process piping have a formal inspection program. Grangemouth had over 600 miles of process piping and needed some way of organizing and prioritizing it.


John Tischuk proposed a simple method for assessing the consequences of failure based on a concepts used in the HAZOP process. This was put together with corrosion prediction models using industry standard methods. This method was successfully piloted in Grangemouth for piping and static equipment and subsequently applied to the entire plant and the adjacent refinery over the next two years. T-OCA was initially a spreadsheet application and was developed into a standalone software using a dBase 3 database.



Working with engineers from Shell and BP, we developed probability of failure models for rotating equipment, pressure safety valves and control valves. We applied these models to the equipment in the Shell Stanlow refinery over the next four years and then assisted Shell in the initial development of the Shell RBI methodology. At the same time we kept the T-OCA system separate and continued its development. During this time we upgraded T-OCA to a Windows 3.1 application with the dBase 3 file format.



We started a technical steering group for T-OCA, which included technical experts from client companies and other interested parties. The group reviewed, amended and approved by ballot all of the probability of failure and consequences of failure models in T-OCA, and the group also guided the development of the product. At this time we also upgraded the T-OCA product to a Microsoft Visual Basic application running against a Microsoft Access database.  



We first began to develop the technology transfer process so that RBI implementers in other locations could use the T-OCA software. The Technology Transfer process is based on training and certification, standard operating procedures, and continuous support. Also in 1997, John Tischuk was asked to join the API 580 risk based inspection sub-committee. He served on the sub-committee and assisted in the writing of several drafts until the first issue of API RP 580 was published in 2002.



We began the first large scale technology transfer projects in Indonesia. The initial project was for a number of onshore oil and gas facilities and terminals. Personnel from a local engineering and inspection were company trained and certified, with local personnel carrying out over 85% of the work on the initial project.



We delivered our First foreign language version of T-OCA in Brazil.



Developed the T-REx family of simple qualitative risk assessment tools. These were simple, configurable tools that allowed for expert driven, qualitative risk assessments. The main uses were for pipelines and atmospheric storage tanks.



Upgraded T-OCA to a Microsoft SQL Server database and upgraded the T-OCA application to Microsoft Dot Net. At the same time, the qualitative risk assessment was included in T-OCA and the separate T-REx product line was discontinued. 



We updated T-OCA to include Integrity Operating Windows in conformance to API 584. Additionally, we added the ability to select and customize the risk matrix size. Furthermore, we upgraded analysis capabilities for pipelines and atmospheric storage tanks.