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2.2.5 Installing the First Nozzle - Diametrical (cont.)
3. Align the jig and nozzle bolt holes and then use the washer and nut to tighten the assembly in place (see
Figure 21 below).
4. Install four sets of studs, nuts, and washers in the jig bolt holes 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 the
way 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 on the four studs to reduce the root gap dimension.
WARNING!
qualified welding procedure.
6. Tack weld the nozzle to the pipe at four diametrically opposed points, with 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 four studs. Then, remove the nut, washer, jig and threaded rod.
Model T17 Installation Guide
Washer and Nut
Bolt Holes
Figure 21: Tightening the Nozzle and Jig
Only qualified personnel should weld bosses and nozzles, using a suitable ASME BPVC IX
Chapter 2. Installing the Pipe Nozzles
15
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