Abstract: A sound damping wallboard and methods of forming a sound damping wallboard are disclosed. The sound damping wallboard comprises a gypsum layer with a gypsum surface having an encasing layer. The encasing layer is partially removed to expose the gypsum surface and form a gypsum surface portion and a first encasing layer portion on the gypsum layer. A sound damping layer is applied to the gypsum layer to cover at least part of the gypsum surface portion and the encasing layer portion.

Abstract: A computerized chemical application system for a water treatment system. The water treatment system includes a main header into which water flows. Periodically water is dumped from the main header. Make-up water is then introduced. At least one liquid chemical is then provided from a tank under the force of gravity through a valve into the main header to replace those chemicals lost during the dumping process. In particular a system computer calculates the velocity of the introduced chemical based on the amount of time it takes for the chemical to flow past a conductivity sensing probe in a chamber of the system as well as the volumetric capacity of that chamber. With the velocity calculated the computer determines the length of time that the chemical is to be introduced and controls the valve accordingly.

Abstract: A computerized chemical application system for a water treatment system. The water treatment system includes a main header conduit through which water flows. Connected in shunt with the main header is a chemical introduction header of smaller diameter and a lower flow rate than the main header. A computer control is provided to sense the conductivity of a reference water flowing through the chemical introduction header. Injection means are provided to introduce a water treatment liquid into the chemical introduction header and to mix it thoroughly with the water flowing therein. The conductivity of the mixture is sensed, and based upon the differential conductivity and values relating conductivity to concentration for the water treatment liquid (which values are stored within the computer control) the amount of the water treatment liquid introduced is precisely controlled.

Abstract: A mixing device for mixing at least two liquids to produce a homogenous mixture. The device includes an elongated chamber in which a vertically oriented elongated mixing cavity is located. The cavity is sealed at its lower end and it is open at its upper end and in communication with the interior of the chamber. An elongated conduit extends the length of the cavity and is adapted to receive liquids to be mixed. The conduit includes a plurality of ports located at longitudinally spaced positions therealong and which ports are directed in different directions. The ports create plural streams of liquid which interact and mix with one another within the cavity. The mixed liquids overflow the cavity and out its top end into the chamber 24. The chamber 24 includes an outlet from which the mixed liquids are withdrawn. In accordance with the preferred embodiment gas eductor means are provided in the inlet to the conduit to introduce gas bubbles within the cavity.

Abstract: A control system and method of controlling the cycling of water in a cooling tower system having a source of make-up water of variable conductivity. The control system apparatus includes respective probes for sensing tower water conductivity and make-up water conductivity. The probes provide signals to a controller unit. Desired cooling system water conductivity parameters are input into the controller unit. The controller unit serves to proportionally adjust the trip point at which dumping of the cooling tower water occurs based upon the sensed water conductivities and the input parameters to maintain a predetermined Langelier's number(s). Means are provided to display system conditions and to effect calibration of the system. The method entails establishing an indexing factor based upon the cooling water parameters and the desired Langelier's number(s) and using that indexing factor for adjusting the trip point.

Abstract: A control system and method of controlling the cycling of water in a cooling tower system having a course of make-up water of variable conductivity.The control system apparatus includes respective probes for sensing tower water conductivity and make-up water conductivity. The probes provide signals to a controller unit. Desired cooling system water conductivity parameters an input into the controller unit. The controller unit serves to proportionately adjust the trip point at which dumping of the cooling tower water occurs based upon the sensed water conductivities and the input parameters to maintain a predetermined Langelier's number(s). Means are provided to display system conditions and to effect calibrations of the system.The method entails establishing an indexing factor based upon the cooling water parameters and the desired Langelier's number(s) and using that indexing factor for adjusting the trip point.

Abstract: The present invention is directed to a method for controlling scale which would otherwise be formed from water-soluble calcium, magnesium and iron impurities contained in boiler water which would provide calcium, magnesium and iron ions.