| 摘要 |
Transient change in heat flux due to ultrasmall variation in flow conditions (say from NO-FLOW-to-FLOW) within a series of flowlines to pinpoint sources of plant upset is achieved, by carefully positioning a series of M transducer-meters for sensing transient heat flux, each meter being disposed at a selected location completely exterior of a flowline, and recording in sequence at a central control center for each of the M meters at least a transient signal indicative of a FLOW condition. For each meter, signals are generated by a thermopile attached to each flowline in a heat flux sensing relationship. Location takes into account the type of fluid being monitored, and the temperature gradient existing across the relief valve. Recordation of the sensed signals is via a series of M recorders and alarm circuits at the control center.
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