Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-08-18
1985-01-15
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340517, 346 33TP, 374 30, G08B 2100
Patent
active
044941129
ABSTRACT:
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.
REFERENCES:
patent: 1528383 (1925-03-01), Schmidt
patent: 3312966 (1967-04-01), Schaller
patent: 3431149 (1969-03-01), Webb
patent: 3767470 (1973-10-01), Hines
patent: 4003250 (1977-01-01), Poppendiek et al.
patent: 4102196 (1978-07-01), Holtermann
patent: 4198859 (1980-04-01), Holtermann
Chevron Research Company
Keeling Edward J.
Messner H. D.
Myer Daniel
Rowland James L.
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