This invention relates to a diagnostic tool for networks that process messages in stages such as pipelined networks. The hub defines a cavity for housing a stop linked in rotation to the hub and acting as support for elastic means support on a counter-stop integral with the hub, while the stop is integral with a friction washer urged in contact with an internal ring of the reaction plate. The liquid flashes to gas in the section of parallel heat exchangers and the resulting gas is forced to the section of series heat exchangers where it is pressurized and warmed. The participation and competitiveness scores may be combined to generate a combined score.