Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-08-18
1985-01-22
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340517, 73195, 73204, G08B 2100
Patent
active
044954883
ABSTRACT:
Transient change in heat flux due to ultrasmall variation in flow conditions (say from no-flow to flow) within a series of relief flowlines to pinpoint sources of plant upset, is achieved by carefully positioning (in each flowline closely adjacent to an associated relief valve) a transducer-meter for sensing transient heat flux from a selected location completely exterior of the line; and recording in sequence: (i) a base line signal indicative of a no-flow, steady state condition at each selected location along the flowline, and (ii) a transient signal indicative of a flow condition. Both types of signals are generated by a plurality of thermocouples (a thermopile) attached to each flowline in a heat flux sensing relationship that 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 recorder, although use of a signaling circuit to immediately alert an operator of a change in flow condition is contemplated.
REFERENCES:
patent: 2729976 (1956-01-01), Lawb
patent: 2808580 (1957-10-01), Fuller
patent: 3431149 (1969-03-01), Webb
patent: 3821895 (1974-07-01), Sumikawa 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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