Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-28
1980-09-02
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340652, 361216, G01R 3102
Patent
active
042209510
ABSTRACT:
When explosive fuels such as hydrocarbons are pumped into or out of a barge or tanker, a metallic conduit having an insulated flange therein is typically connected to the barge. The method of this invention involves connecting the barge to the earth through a barge-grounding cable, connecting the metallic conduit to the earth through a conduit-grounding cable, whereby a grounding test circuit is established with a current source connected between the earth and the grounding cables. A flange resistor is connected across the insulated flane to form a flange circuit. The currents flowing through the grounding cables are being continuously monitored in the grounding circuit to determine the presence of a broken connection or of an ineffective electric contact. A continuity test is also continuously being made of the flange insulation in the flange. A plurality of sensing relays are operatively coupled to the grounding test circuit and to the flange circuit for sensing the currents flowing in the grounding test circuit and in the flange circuit. The sensing relays are operatively interconnected through suitable switching means with an alarm circuit having warning devices which can be continuously or intermittently operated to indicate safe and dangerous operating conditions.
REFERENCES:
patent: 2611862 (1952-09-01), Riddle et al.
patent: 3223604 (1965-12-01), Marsh et al.
patent: 3343154 (1967-09-01), Seesselberg
patent: 3913010 (1975-10-01), Scarpino
patent: 4075675 (1978-02-01), Burkett et al.
patent: 4110807 (1978-08-01), Neuhouser
Bash Leroy A.
Cherry Raymond B.
McDuffie William N.
Speck Robert M.
Breston Michael P.
Brigance Gerald L.
Cathodic Protection Services, Inc.
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