Abstract: Described is an insulation module (1) for a vessel (2) used in a chemical plant. The module may take the form of a panel having an outer surface layer (3) and an insulation layer (5) secured to the outer surface layer (3). Mounting means (10) extends from the panel (1) and enables mounting of the insulation module (1) on an outer wall (2) of the vessel. An air gap (15) is provided between the insulation layer (3) and the outer vessel wall (2) when the insulation module is mounted (1) on the vessel (2).

Abstract: A pre-formed insulation module is disclosed having a part cylinder body. The body includes an unstriated insulation layer formed of a rigid insulating material substantially uniform in composition and density over its cross section. The insulation layer has an inner surface adjacent to a surface of a component to be insulated, and an outer surface generally concentric to the inner surface. A substantially non-fibrous resilient cladding layer shaped to the body is directly adhered to the insulation layer at the outer surface. Connection means are disposed along the length of the body for connecting with a further insulation module, wherein the insulation and cladding layers of each module are brought into relative contact along the contacting surfaces of the modules to insulate a portion of the component.

Abstract: A first flow of air is compressed in a first air compressor associated with a gas turbine and is purified in an adsorptive purification unit which separates water vapour and carbon dioxide from the air. The purified first flow of air is further compressed to a pressure at least 5 bar higher than that at which it is purified in a second air compressor whose outlet pressure is independent of fluctuations in the power output of the gas turbine, is cooled in a main heat exchanger, is passed through an expansion valve, and is introduced into a higher pressure rectification column. A second flow of air is compressed in a third air compressor which is independent of the gas turbine. The compressed second flow of air is purified in an adsorptive purification unit by the separation of water vapour and carbon dioxide therefrom. The purified second flow of air is cooled in the main heat exchanger and is introduced into the higher pressure rectification column.