Panametrics T17, Installation Manual, Page: 42 / 76

Chapter 2. Installing Pipe Nozzles
30 Model T17 Installation Guide
2.3.5 Installing the First Nozzle, Non-Diametrical Mid Radius (cont.)
3. Align the jig and nozzle bolt holes and tighten the assembly in place, using the washer and nut.
4. Install studs, nuts, and washers in the bolt holes on the flange/jig assembly and tighten the nuts.
5. The jig, boss, and nozzle combination is designed to provide a 0.094 in. (2.4 mm) root gap between the beveled
edge of the nozzle and the outside diameter of the pipe. If the 0.094 in. (2.4 mm) clearance does not exist all
around, the nozzle must be removed and ground appropriately to provide the required clearance. If the root gap
is larger than the 0.094 in. (2.4 mm) dimension, then suitably sized washers may be inserted between the jig and
the nozzle to reduce the root gap dimension.
6. Tack weld the nozzle to the pipe at four diametrically opposed points, each tack being approximately 0.6 in. (15
mm) in length. Allow the welds to cool for 30 seconds between tacks.
7. Proceed to complete the root pass and subsequent filler passes as required.
8. Allow the welds to cool, then remove the threaded rod, washer, nut, and jig.
WARNING!
Only qualified personnel should weld bosses and nozzles, using a suitable ASME BPVC IX
qualified welding procedure.