Abstract: Methods and systems are disclosed for removing cuprous oxide deposits from a copper-containing water-based cooling system, such as those used to cool stators in industrial generators, without disrupting operation of the cooling system. A complexing agent, such as a 1,10-phenanthroline, e.g., 2,9-dimethyl-1,10-phenanthroline (neocuproine), a 2,2-bipyridine compound, or the like can be introduced into the coolant fluid to facilitate dissolution of the deposits by forming a complex with the cuprous ions. The complexing agent can be dissolved in an alcohol at a concentration of about 4-5%, and then added to the coolant fluid to a concentration of about 6e-3 M or less to avoid undesirable precipitation of the agent. The complexing agent can be recovered by flowing the coolant mixture through an adsorbent material such as activated carbon, and the copper can be removed from the agent by reacting it with sodium sulfide.

Abstract: A ball bar gage for obtaining the accuracy of numerical control machines and the like including telescoping means integrated with an interferometer and the method of measuring the distances between two locations including an initialization process that ascertains the absolute length of the distance being measured from the differential changes in length measured by the interferometer and a computer that calculates by a trilateration computation 2 or 3 dimensional coordinates by computing the measurements obtained by the ball bar gage. A laser beam or other light source are contemplated to energize the interferometer. Similar calculations are performed with the ball bar gage and computer over a number of spatial locations commensurate with determining the accuracy of the machine being evaluated.

Abstract: A buffer zone disposed between the TOBI (tangential on-board injector) discharge cavity and the forward rotor cavity of a gas turbine engine serves to maintain the TOBI air relatively pollutant free by judiciously controlling the flow to maintain the pressure of the buffer cavity below the adjacent cavities. The buffer cavity air and the forward rotor cavity air are bled to the dead rim area of the turbine rotor disk through tangentially oriented discharge ports formed in the circumferentially spaced plenums formed in the stator support. Plates on the bottom of some of the plenums block off the flow from the forward rotor cavity and buffer air from the buffer cavity flows through these closed of plenums to maintain the proper pressure relationship amongst the cavities.