T5 Flare Gas Transducer Installation Guide
13
Chapter 1. Installing Pipe Nozzles
1.2.6 Installing the Second Nozzle
To install the second nozzle, complete the following steps:
1.
Insert the jig into the second nozzle and position this assembly over the boss and under the alignment plate.
Then, insert the threaded rod.
2.
The jig, boss, and nozzle assembly 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 this gap is not present all the way around the nozzle,
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 evenly all the way around the nozzle, then suitably sized washers may
be inserted between the jig and the nozzle to reduce the root gap dimension.
3.
Secure the alignment plate by installing the two sets of four bolts on the alignment plate. Also, install the
washer and nut on the threaded rod.
4.
Line up the nozzle scribe marks with the pipe scribe marks and tighten all the nuts.
5.
Make sure the nozzle is still in alignment.
6.
Tack weld the nozzle to the pipe at four diametrically opposed points, each tack being approximately
0.2 in. (5 mm) in length. Allow the weld to cool for 30 seconds between tacks.
7.
Complete the root pass and subsequent filler passes as required.
8.
Allow the weld to cool, and then remove all nuts and bolts, the alignment plate, the jig, the spacer flange and
the threaded rod. The completed installation should appear as shown below.
WARNING!
Only qualified personnel should weld bosses and nozzles, using a suitable ASME IX
qualified welding procedure. All applicable safety codes should be observed.
Jig
N
ozzle
End View
Spacer
Flange
Alignment Plate
