Abstract: A seal assembly for restricting fluid leakage flow through a fluid leakage cavity defined between a first component and second component that is rotatable about an axis relative to the first component, the seal assembly having a fluid jet outlet configured to admit a fluid jet into the fluid leakage cavity in an upstream direction which is inclined to the axis, a first flow restriction located downstream of the fluid jet outlet and at a location such that the fluid jet admitted from the fluid jet outlet would impinge on the first flow restriction once the fluid jet has turned to flow in an axial direction, and a second flow restriction located downstream of the first flow restriction. An axial flow turbine having a turbine rotor mounted within a housing may incorporate such a seal assembly in a fluid leakage cavity defined between the turbine rotor and the housing.

Abstract: There is provided an apparatus for monitoring a wearer of a breathing apparatus, comprising a pressure detecting device and a mobile monitoring unit. The pressure detecting device comprises a pressure transducer arranged to detect a pressure of a gas supply of the breathing apparatus; and a wireless transmitter arranged to wirelessly transmit a preset number of ON signals when it is determined that the pressure of the gas supply has exceeded a predetermined on threshold. The mobile monitoring unit is arranged to be attached to the wearer and comprises a motion sensor arranged to monitor the motion of the wearer; an alarm; and a wireless receiver arranged to receive signals wirelessly transmitted by the wireless transmitter of the pressure detecting device.

Abstract: A seal assembly for restricting fluid leakage flow through a fluid leakage cavity defined between a first component and second component that is rotatable about an axis relative to the first component, the seal assembly comprising a fluid jet outlet configured to admit a fluid jet into the fluid leakage cavity in an upstream direction which is inclined to the axis, a first flow restriction located downstream of the fluid jet outlet and at a location such that the fluid jet admitted from the fluid jet outlet would impinge on the first flow restriction once the fluid jet has turned to flow in an axial direction, and a second flow restriction located downstream of the first flow restriction. An axial flow turbine comprising a turbine rotor mounted within a housing may incorporate such a seal assembly in a fluid leakage cavity defined between the turbine rotor and the housing.

Abstract: In a process for producing leaves (20, 20?) for a leaf seal, in particular as a seal for a gas turbine, which leaves (20, 20?) are laterally delimited by a peripheral edge contour and have regions of different thicknesses (d1, d2), a simplification, without sacrificing precision, is achieved by virtue of the edge contour of the leaves (20, 20?) being cut out of a metal sheet (28) by an etching process and the regions of different thicknesses (d1, d2) also being produced simultaneously as part of the etching process.

Abstract: In sealing arrangement 41 between first and second relatively rotatable bodies of a machine such as a steam turbine, a relatively high pressure p0 exists on one side of the sealing arrangement and a relatively low pressure pf exists on the other side. The sealing arrangement comprises a series of sealing elements or units S1, S2, S3, at least one of which comprises a brush seal. A seal bypassing device, preferably comprising a pressure relief valve 42-44 limits the pressure drop across the brush seal.

Abstract: A sealing arrangement in a steam turbine is deployed in a position where it can restrict flow of steam along a flowpath in a gap between two bodies of the turbine rotatable relative each other, the flowpath proving communication between a space of relatively high pressure and another of relatively low pressure. The sealing arrangement comprises a leaf seal mounted on one of the bodies and sealingly engaged with the other. Two or more leaf seals can be juxtaposed with each other, without need for labyrinth seals, in a steam turbine application, without deleterious effects experienced in use of brush seals in similar circumstances. The sealing arrangement can include segments displaceable from a sealing position to increase clearance during start-up of a turbomachine, thereby taking account of potential vibration problems as the turbine rotor passes through natural frequencies.

Abstract: A sealing arrangement is provided between relatively rotatable bodies of a machine in which, in operation, a relatively high pressure (P1) exists on one side of the sealing arrangement and a relatively low pressure (P2) exists on the other side, the pressure difference (P1-P2) being up to a predetermined maximum pressure difference (?Pmax). The sealing arrangement includes a series of seals, the pressure dropping across each successive seal from the high pressure side of the sealing arrangement to the low pressure side. At least two of the seals are flexible seals, e.g. brush or leaf seals. Each flexible seal 14 is designed to function under a pressure drop (?p) up to a predetermined maximum pressure drop (?pmax) across the flexible seal 14 and to provide a given resistance to fluid flow.