A coke plant includes multiple coke ovens where each coke oven is adapted to produce exhaust gases, a common tunnel fluidly connected to the plurality of coke ovens and configured to receive the exhaust gases from each of the coke ovens, multiple standard heat recovery steam generators fluidly connected to the common tunnel where the ratio of coke ovens to standard heat recovery steam generators is at least 20:1, and a redundant heat recovery steam generator fluidly connected to the common tunnel where any one of the plurality of standard heat recovery steam generators and the redundant heat recovery steam generator is adapted to receive the exhaust gases from the plurality of ovens and extract heat from the exhaust gases and where the standard heat recovery steam generators and the redundant heat recovery steam generator are all connected in parallel with each other.

A coke plant includes multiple coke ovens where each coke oven is adapted to produce exhaust gases, a common tunnel fluidly connected to the plurality of coke ovens and configured to receive the exhaust gases from each of the coke ovens, multiple standard heat recovery steam generators fluidly connected to the common tunnel where the ratio of coke ovens to standard heat recovery steam generators is at least 20:1, and a redundant heat recovery steam generator fluidly connected to the common tunnel where any one of the plurality of standard heat recovery steam generators and the redundant heat recovery steam generator is adapted to receive the exhaust gases from the plurality of ovens and extract heat from the exhaust gases and where the standard heat recovery steam generators and the redundant heat recovery steam generator are all connected in parallel with each other.

A method for joining two structural elements by welding, in particular by butt welding comprises forming a weld line joining the two structural elements; and adding material across the weld line, thereby forming one or more crack stoppers for limiting crack propagation along the weld line. The one or more crack stoppers each have a limited extension along the weld line as seen in relation to a length of the weld line. A structural system comprising two structural elements joined by the method is disclosed. The method may be applied, e.g., to components of aircraft engines.

A method for repairing a disk stack includes providing a disk stack comprising a plurality of original disks, each of the original disks defining a groove pattern, the disk stack defining a damaged region; removing the damaged region from the disk stack to define an insert opening in the disk stack; providing a disk stack repair insert comprising a replacement disk segment; and inserting the disk stack repair insert into the insert opening to repair the damaged region.

A method for repairing a disk stack includes providing a disk stack comprising a plurality of original disks, each of the original disks defining a groove pattern, the disk stack defining a damaged region; removing the damaged region from the disk stack to define an insert opening in the disk stack; providing a disk stack repair insert comprising a replacement disk segment; and inserting the disk stack repair insert into the insert opening to repair the damaged region.

A multi component braze filler alloy is described having a melting temperature less than about 1235 deg. C. and greater than about 1150 deg. C. This alloy can be processed by hot isostatic pressing (HIP) at a temperature above about 1065 deg. C. and is particularly suited for the repair of gas turbine blades and vanes, especially those made from Alloy 247. The relatively low Ti content in the present braze alloy tends to form less MC carbides at the joint interface, particularly in comparison with other braze alloys high in Zr and/or Hf. Processes for employing this braze filler alloy in processing of nickel-base superalloys, especially Alloy 247, are presented.

One or more techniques and/or systems are disclosed for a replacement insert, which may be used for replacing stripped threads and providing the new smooth surface for a washer/gasket on component, such as for a vehicle. The insert has an inner and outer threaded surface, and the inner threads are merely partially formed in the inner cavity of the insert, leaving an unthreaded surface proximate the end of the insert. The insert has a shoulder with a greater diameter than the hole into which it is inserted, to stop further insertion. The insert can be threaded into the hole using the thread chaser bit screwed insert, and continued rotation of the chaser past a thread stop can form remaining threads, allowing for application of torque to install the insert in the component.

A method for repairing a turbine housing of an air cycle machine is provided. The method comprises: removing damaged material from a journal bearing bore of the turbine housing; forming the journal bearing bore to an inner diameter of about 2.580±0.001 inches (6.553±0.003 centimeters). The journal bearing bore having an inlet and an outlet. The method also comprises determining the inner diameter of the journal bearing bore; and forming a cylindrical insert having a first end, a second end, an inner surface, a step located at the first end, and an outer surface with an outer diameter that provides a diametric interference with the inner diameter of the journal bearing bore. The diametric interference being between about 0.000-0.003 inches (0.000-0.008 centimeters). The method further comprises inserting the second end of the cylindrical insert into the inlet of the journal bearing bore up to the step.

An active braze alloy composition is described, including nickel; or a combination of nickel and cobalt; about 2% by weight to about 30% by weight germanium; and about 1% by weight to about 5% by weight boron and about 0.5% by weight to about 5% by weight of at least active element. The composition is free of silicon. Braze alloy joints formed of the braze alloy composition, and located in various devices, structures, and machines, are also described. A related method for repairing a crack or other cavity within a metal component, using the braze composition, is further described.

Embodiments of the present disclosure relate generally to an apparatus and method for treating a rotatable component. An apparatus according to the present disclosure can include: a sliding engagement member configured to slidably engage a portion of a rotating component that is temporarily stationary; and a tool engaging member for positioning a machining tool relative to the rotating component to machine a surface of the rotating component, wherein the tool engaging member is rotatable to one of a plurality of angles relative to the sliding engagement member.