Abstract: A fluid is cooled and liquefied in an apparatus with a heat exchanger. A plurality of flow passages has two or more primary groups of one or more primary flow passages. Each primary group carries a part of the fluid stream through the heat exchanger and indirectly cools the part of the fluid stream against a refrigerant in the shell side of the heat exchanger to provide a liquefied fluid stream. A primary inlet header connects the two or more primary groups of primary flow passages to a source of the fluid, and is arranged to split the fluid stream between the two or more primary groups of primary flow passages. Valves are provided for selectively blocking at least one of the two or more primary groups of primary flow passages whilst allowing the fluid stream to flow through the remaining unblocked primary groups of primary flow passages.

Abstract: A fluid is cooled and liquefied in an apparatus with a heat exchanger (5) having a shell side (78) within its walls (85) and a plurality of flow passages extending through the shell side (78). The plurality of flow passages comprises two or more primary groups (40a, 40b) of one or more primary flow passages, each said primary group for carrying a part of the fluid stream through the heat exchanger (5) and to indirectly cool said part against a refrigerant in the shell side (78) of the heat exchanger (5) to provide a liquefied fluid stream (50, 70). A primary inlet header (6,6?) connects the two or more primary groups (40a, 40b) of primary flow passages to a source of the fluid (10), and arranged to split the fluid stream between the two or more primary groups (40a, 40b) of primary flow passages.

Abstract: A boil-off gas (BOG) stream (15) from a liquefied hydrocarbon storage tank is split into a BOG heat exchanger feed stream (25) and a BOG bypass stream (35). The BOG heat exchanger feed stream (25) is heat exchanged in a BOG heat exchanger (40) against a process stream (135), thereby providing a warmed BOG stream (45) and a cooled process stream (195). The warmed BOG stream (45) is combined with the BOG bypass stream (35) to provide a temperature controlled BOG stream (55).

Abstract: A process of liquefying a gaseous, methane-rich feed to a liquefied product is provided that includes adjusting the composition and the amount of refrigerant and controlling the liquefaction process using an advanced process controller based on model predictive control to determine simultaneous control actions for a set of manipulated variables.

Abstract: A process of liquefying a gaseous, methane-rich feed to a liquefied product is provided that includes adjusting the composition and the amount of refrigerant and controlling the liquefaction process using an advanced process controller based on model predictive control to determine simultaneous control actions for a set of manipulated variables.

Abstract: Liquefying a stream enriched in methane comprising a) supplying a natural gas stream to scrub column, removing in the scrub column heavier hydrocarbons from the natural gas stream to obtain a gaseous overhead stream withdrawn from the top of the scrub column, partly condensing the gaseous overhead stream and removing from it a condensate stream, which is returned to the upper part of the scrub column as reflux; b) liquefying the stream enriched in methane in a tube arranged in a main heat exchanger by indirect heat exchange with a multicomponent refrigerant evaporating at low refrigerant withdrawn from the shell side of the main heat exchanger and partly condensing it at an elevated refrigerant pressure, and c) compressing the multicomponent refrigerant pressure in a tube arranged in an auxiliary heat exchanger by indirect heat exchange with an auxiliary multicomponent refrigerant evaporating at low auxiliary refrigerant pressure to obtain multicomponent refrigerant for use in step b), wherein partly condensi

Abstract: A method is provided to liquefy and treat natural gas containing components having low boiling points, the method includes: liquefying natural gas in a main heat exchanger; cooling the liquefied gas in an external heat exchanger; allowing the cooled liquefied gas to expand dynamically; introducing the expanded fluid in the upper part of a fractionation column; allowing the liquid of the expanded fluid to flow downwards thorough contacting section; withdrawing a liquid recycle stream which is passed through the heat exchanger to obtain a heated two-phase fluid; introducing the two-phase fluid in fractionation column, and allowing the vapour to flow through the contacting section; collecting the liquid of the two-phase fluid in the lower part of the fractionation column; and withdrawing therefrom a liquid product stream having a reduced content of components having low boiling points; and withdrawing from the fractionation column a gaseous stream which is enriched in components having low boiling points.

Abstract: Method of cooling a fluid stream which passes through a hot side (Id, Ib, Ic) of a main heat exchanger (I) comprising removing refrigerant from the main heat exchanger (I); compressing refrigerant in a two-stage compressor unit (7) to obtain refrigerant at high pressure; partly condensing (12) the refrigerant to obtain a first two-phase fluid, and separating (13) the first two-phase fluid into a first condensed fraction (15) and a first gaseous fraction (16); cooling the first condensed fraction (15) in an auxiliary heat exchanger (2) to obtain a cooled first condensed fraction (18), cooling the first gaseous fraction (16) in the auxiliary heat exchanger (2) to obtain a second two-phase fluid (26), wherein cooling is provided by liquid evaporating at intermediate pressure in the cold side (2a); separating (28) the second two-phase fluid into a second condensed fraction (33) and a second gaseous fraction (32); allowing part of the second condensed fraction (49) to evaporate in the cold side (2a) of the auxilia