FOR USE WITH ANSI 3”, 80mm, AND SMALLER FLANGE SIZES
Download the Delta
Controls Model HRM Detailed Datasheet 
Features 
Application
Refractory drilling through small size HTP mounting nozzles requires that the nozzle inside wall surface be relatively smooth. The nozzle ID is used as a positioning race for the, diamond core drill sleeve bearings. The area around the pipe nozzle to shell transition can contain slag left from cutting the hole, excessively penetrated weld, etc. the area around the flange to pipe nozzle transition weld commonly contains excess weld material, buckshot, and the like. The Delta Controls NSO tool is used to remove this material, allowing proper guiding of the drill bit.
The NSO tool consists of carbide cutters brazed to a tube and a 12” extension shaft. The cutter OD is sized to remove excessive metal from the nozzle inside wall. A Claus reactor that is being relined can have precipitated oxides and other nonmetallic buildup in the HTP mounting nozzle. The NSO tool will cut this buildup out as well.
The same drill motor and water swivel used by the diamond core drill drives the NSO tool. Water cools, lubricates and flushes the NSO cutters; it should be continuously injected during the cutting operation. Remove the NSO after smoothing the nozzle I.D. the next step is to put the diamond core drill subassembly in place. The hole through the refractory and the recess for the collar can now be cut straight and on the centerline of the nozzle.
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