Abstract: Plural pipe-based well screen segments can be assembled more quickly and easily and with no chance of damage to the screen jacket by welding a boss ring to the center pipe of each segment intermediate the upper pipe end and the screen jacket and then using a slip to support the boss ring. The slip is designed to be supported by holes normally present in the master bushing of a rotary drilling table or platform and is of sufficient height that the screen sections can be joined without the operator having to bend over. A pair of relatively light weight, hinged cantilevered plates can be easily lifted to provide clearance for the screen jacket to be lowered through the table and are then moved to their horizontal position just before the boss ring portion of the screen is lowered so as to engage them. A vertical bar on the slip acts as a wrench stop to permit the upper end of the pipe to be held stationary as the succeeding segment of screen is threaded to it.

Abstract: Device for facilitating the assembly of lengths of jacketed pipe base well screens in wells, wherein assembly is to be with manual or power tongs which have a greater vertical height than the blank pipe base end sections of the screens. The device includes a pair of pivoted semicylindrical portions which have compressible rubber liners at their ends which overlie the screen jacket and jaws at their ends which overlie the blank pipe. A removable pin locks the screen jacket end of the device at a fixed O.D. while the jaw end has a gap between the nonpivoted edges of the pivoted portions which permits a reduction in diameter as force from a set of tongs compresses the device and the jaws therein against a blank section of pipe.

Abstract: A method and apparatus is provided for the two stage grinding of paper material with the controlled addition of dry and wet fire retardant chemicals to produce a desirable cellulose insulation material. The paper is first ground into coarse granules which are placed in a storage hopper and systematically fed by an auger into a fine grinder. At the same time that the cellulose material is introduced into the fine grinder, a controlled flow of dry fire retardant chemicals is continuously added and ground with the material. The resultant granular material is then transported by air in an upward direction where a solution of liquid fire retardant chemicals is sprayed in a concurrent direction with the flow so as to wet and saturate the cellulose material producing a fire retardant product. The wetted material, because of its adhering qualities, is directed through a corrugated flexible pipe section to storage.

Abstract: An improved debridger is provided in one or more storage bins in a cellulose insulation manufacturing plant which minimizes the bridging of the cellulose insulation across the storage bins between an inlet at the top thereof and an auger-fed outlet at the lower end thereof. The debridger comprises a vertical rotatable shaft having a plurality of horizontally extending arms for agitating the insulation and minimizing bridging. The arms or vanes on the auger vary in length and are removable from the vertical shaft for installation of the shaft in the bins. The shaft is rotatably driven by power means located outside of the storage bin.

Abstract: Plural pipe-based well screen segments can be assembled more quickly and easily and with no chance of damage to the screen jacket by welding a boss ring to the center pipe of each segment intermediate the upper pipe end and the screen jacket and then using a slip to support the boss ring. The slip is designed to be supported by holes normally present in the master bushing of a rotary drilling table or platform and is of sufficient height that the screen sections can be joined without the operator having to bend over. A pair of relatively light weight, hinged cantilevered plates can be easily lifted to provide clearance for the screen jacket to be lowered through the table and are then moved to their horizontal position just before the boss ring portion of the screen is lowered so as to engage them. A vertical bar on the slip acts as a wrench stop to permit the upper end of the pipe to be held stationary as the succeeding segment of screen is threaded to it.