Patent ID: 7347661

Claim:
A casing arrangement for surrounding a rotary component of a gas turbine engine, the casing arrangement comprising: a casing member formed to extend at least partially around the component, wherein at least one fluid flow path for the flow of a heat transfer fluid is formed within the casing member; and a control device to control the rate of flow of heat transfer fluid through said defined at least one fluid flow path and hence the extent of thermal expansion of said casing member, wherein the casing member includes formations to mount a seal segment inwardly of the casing member, whereby the seal segment is positioned between the casing member and the rotary component, the casing member defines a plurality of said paths which extend generally parallel to one another, said paths extending from an upstream region to a downstream region of the casing member, and the seal segment defines at least one fluid flow passage which is in communication with said at least one fluid flow path within the casing member.