Abstract: A method and apparatus for measuring gas flow in a conduit includes the steps of providing a plurality of gas flow measuring devices, positioning the gas flow measuring devices at a plurality of positions in the conduit, and substantially simultaneously measuring the gas flow at each position. A gas flow measuring apparatus includes a plurality of flow-measuring probes, each probe including one or more gas flow measuring devices, a separate pressure transducer connected to each probe, a data logger connected to the transducers, and a computer connected to the data logger.

Abstract: An apparatus for use during modernization of a group of elevators to maintain optimum service to a building includes an Interim Traffic Manager (ITM) system which evenly distributes hall call routing between old and new elevator controls. During the time that an elevator to be re-equipped is out of service, the original not yet re-equipped elevators, as well as the already re-equipped elevators, respond as a single bank, one elevator car per call. The ITM system is connected between the hall call registering devices and each of old and new elevator controls. When a floor push button is pressed, the ITM system uses a routing algorithm to decide whether to send the call to the old or to the new elevator control based upon traffic loading. The ITM system is an inexpensive, reusable unit which resides on the job site temporarily and, therefore, adds no additional costs to the modernization of an elevator group.

Abstract: A streamlined coal slurry letdown valve is featured which has a two-piece throat comprised of a seat and seat retainer. The two-piece design allows for easy assembly and disassembly of the valve. A novel cage holds the two-piece throat together during the high pressure letdown. The coal slurry letdown valve has long operating life as a result of its streamlined and erosion-resistance surfaces.

Abstract: A visbreaker, letdown valve is featured which maintains a smooth flow of furnace effluent. Liquid passing through the throat of the valve is throttled, and a portion is caused to flash to vapor. The valve is designed to allow for subsonic flow of the vapor under all process conditions. A quenching fluid is also added to the liquid passing through the throat in order to cool the liquid.