초록 ▼

The invention discloses a method and an apparatus for explosion protection of plants, pipelines and the like by monitoring chronologically successive values of the system pressure in the potentially explosive area and by comparing these values with a predetermined pressure threshold, where the excee

The invention discloses a method and an apparatus for explosion protection of plants, pipelines and the like by monitoring chronologically successive values of the system pressure in the potentially explosive area and by comparing these values with a predetermined pressure threshold, where the exceeding of this pressure threshold is used as a triggering criterion for initiating explosion protection provisions. According to the invention, instead of predetermining a constant value as the pressure threshold, the pressure threshold is updated continuously in accordance with the system pressure prevailing at that time. As a result, the pressure threshold can be set with a smaller safety margin above the system pressure than before. Brightness and temperature thresholds may also be used singly, or together with pressure in any combination in continuous value monitoring.

대표청구항 ▼

An automatic system for automatically coping with an emergency situation in plant facilities, pipelines and the like wherein a system reference variable is continuously updated to a value which is higher than a prevailing means system parameter value by a safety margin, said system comprising: senso

An automatic system for automatically coping with an emergency situation in plant facilities, pipelines and the like wherein a system reference variable is continuously updated to a value which is higher than a prevailing means system parameter value by a safety margin, said system comprising: sensor means for monitoring successive system parameter values of said system in selected areas, said sensor means being connected to an analog/digital converter arranged to supply signals representing said monitored system parameter values to a control unit and to a comparison means, said control unit supplying at least some of said system parameter values to a memory means for retention in memory and further supplying the monitored system parameter values fed to said memory means to a mean value forming means for calculating a mean value from values fed thereto over a time interval, said means value forming means being connected to a means value incrementing means arranged to increase each said means value supplied to it by said safety margin to create a reference variable, said mean value incrementing means being arranged to supply said reference variable to said comparison means for comparison with said monitored successive system parameter values, said comparison means sending a trigger signal to a triggering means to activate said triggering means upon a monitored system parameter value exceeding said reference variable, and said triggering means automatically producing a signal which is directed to said means for initiating protective provisions for coping with said emergency situation.