Model HRG • Refractory Drilling System Features Refractory drilling system for use with Delta Controls thermocouples and pyrometers Produces concentric refractory hole drilling Drill guide is rigidly mounted on the vessel nozzle flange Diamond cutting fragments are embedded in a ceramometallic matrix Flushing promotes rapid cutting and straight drilling Water-cooled bit lengthens life Description The Delta Controls Model HRG Drilling System protects the design clearances of thermocouples by drilling straight, centered, and perpendicular holes. Using the HRG ensures successful installation of the Delta Controls Model HTP, HTX, and HTS thermocouples which require close tolerances in the creation of the hole through the refractory. The HRG guide is mounted on the vessel nozzle flange and keeps the drill bit on the centerline of the nozzle during drilling. The water swivel adapter and flow control valve deliver the proper amount of water to facilitate the drilling without introducing excessive water to the vessel interior. The final result is a straight hole that is properly positioned to accept the refractory well and the thermocouple. This precision hole permits proper insertion of the Model HRW outer protective thermowell and provides proper clearances for refractory movement. Specifications Flange Size: Nozzle Height and Refractory Thickness: Refractory Thickness: Hole Size: Drill Bit: Water Swivel: Drill Bit Extension (Length as Required): ANSI 4 in Class 150 to 6 in Class 300 DIN 90 to 175 mm Nozzle Inside Diameter: ≥ 3.44 in (≥ 87 mm) ≤ 22 in (560 mm) (option EXD if longer) ≤ 22 in (560 mm) 2.20 in (56 mm) Diamond core type, requires water flushing 0.625 - 11 TPI to 0.5 in tri-shaft drill drive shaft, 0.75 in - 11 NH Female Hose connector, flow control valve, quarter turn hose coupling 12 in (300 mm), ≥ 24 in (600mm) Model HRG 36 | Temperature > Model HRG | deltacnt.com