ARTIS, the Availability and Reliability Tracking Information System, is our web based modelling, reporting and training tool for computing the available capacity of a continuous production system that is subject to maintenance, inspection, testing, failure and repair. For example, it can be applied to oil and gas projects, gas liquefaction plants and refineries. Whereas process flow simulations can determine the maximum operating capacities, ARTIS calculates the available capacity levels of a system, their frequency and duration and the integrated system availability.
ARTIS can take as input the current state of the equipment items and then calculate the available capacity levels and production availability of the system, conditioned on the current state. This is the 'Live Application', called ARTIS Live, and may include upload interfaces to Plant Information, Computerised Maintenance Management System (CMMS), Condition Monitoring and other databases.
ARTIS has two components:
- The graphical user interface is clean, flexible and easy to learn. Model building is intuitive, with the familiar selection, cut, copy and paste operations, similar to the common word processing software.
- A model can have all equipment items that are critical to the production, arranged in hierarchical groups according to the design plans and the impact on system availability. ARTIS enables a bird's eye overview of the model and the user can zoom in on the critical parts of the model that require detailed attention.
- For running sensitivities, a model can be fully parameterised, greatly increasing confidence in the model and making it much easier to keep up with design changes during the project development and manage version control.
- All operations can be done on any selection of a model, making it easy to build it up step by step. For example, many systems have similar trains, and with ARTIS whole trains and groups can be copied in one go, with automatic renumbering of the item names.
- Runs can be done on any selection of the model, making it easy to provide the criticality ranking and break down the results.
The ARTIS engine has some unique strengths too; is based on robust and efficient analytical and numerical mathematical methods and does not rely on Monte Carlo simulations. Even for models with thousands of equipment items, the ARTIS runs are quick and free of statistical noise. For large models, where Monte Carlo based tools may take hours or more, the typical ARTIS run times remain below 1 minute. Using one and the same model, the ARTIS engine can cover all different scenarios:
- on the past, for performance tracking and reporting
- on the present, for monitoring and scheduling
- on the future, for evaluation of project development alternatives and identification of bottlenecks, maintenance optimisation and target setting
Sea water cooling facilities
An ARTIS V2.3 production availability model has been used to identify where the best value improvements can increase the system performance of the sea water cooling system in a refinery. The impact of these improvements in the model indicates that there is opportunity for significant improvements in the system, estimated to increase the current production availability of approximately 82% by about 15% to almost 97%.
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