Modern instrumentation requires less access as a result of improved MTBF (MeanTime between Failure, MVC (Measurement Validation and Comparison), and remote diagnostics via ‘intelligent’ communication. Increased TCoO awareness and on-line instrument developments are the main criteria for the development and selection of direct mounting systems. In the slimline concept, the on-line instrument and its manifold are mounted directly on and supported from the process connection(s). The primary isolation valve and instrument manifold are combined in one component. The primary isolation valve is fulfilling all mechanical quirements, like fire-safety, Outside screw and Yoke (OS&Y), a round handwheel and a backseat. The primary valve satisfies the requirements of mechanical and instrument engineering. This concept is characterised by a small number of components, forming a compact design with no or some standardisation.

The market forces requires manufacturers to design economically attractive and technically reliable solutions. The role of the manufacturer in projects will be that of a solutions provider instead of a material supplier. In general it can be said that in 85% of the cases the close coupled systems can be used.

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