SYSTEM AND METHOD FOR PREVENTING TOTAL PLANT SHUTDOWN DUE TO LOW TEMPERATURE EXCURSION

A system of interlocks for controlling flow of low temperature process streams in a manufacturing process through a cold box to equipment or piping not specified for such temperatures by opening and closing valves and starting and stopping pumps. At least one interlock affects streams heated in the...

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Bibliographische Detailangaben
Hauptverfasser:	Pitt, W. Ryan, Landreneau, Newton, Darbonne, Toby, Guillory, JR., Gregory M, Istre, Kenneth M, Demarest, Charles R, Irwin, Troy L, Ting, Tiong-Ee
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY COMBINED HEATING AND REFRIGERATION SYSTEMS CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING CRACKING HYDROCARBON OILS FUELS FUNCTIONAL ELEMENTS OF SUCH SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS LUBRICANTS MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING METALLURGY MINERAL WAXES MIXTURES BY PRESSURE AND COLD TREATMENT MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS NON-POSITIVE DISPLACEMENT PUMPS PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PHYSICS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION PUMPS FOR LIQUIDS OR ELASTIC FLUIDS RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA REFRIGERATION OR COOLING REGULATING SEPARATION TECHNICAL GASES CONTAINING CARBON MONOXIDE TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A system of interlocks for controlling flow of low temperature process streams in a manufacturing process through a cold box to equipment or piping not specified for such temperatures by opening and closing valves and starting and stopping pumps. At least one interlock affects streams heated in the cold box. At least one interlock affects the streams cooled in the cold box. The interlocks are activated by temperatures of process lines to prevent exposure of equipment and piping to low temperatures while preventing the shutdown of the cold box. An override controller including a predictive failure capability is also provided.