FPD350 Torbar
Averaging pitot tubes
2 Initial Installation
24
OI/FPD350–EN Rev. H
2.18 Flanged Pipe Fitting (Stand-Off) Installation
Install the flanged pipe fitting (stand-off) as follows:
1. Select the required insertion position and mark the pipe.
2. Drill a 6 mm (0.24 in) pilot hole at the marked position,
then drill to the appropriate size – see Table 2.11.
3. Referring to Fig. 2.17:
a. Place the flanged pipe fitting (stand-off)
A
centrally
over the drilled hole (models FPD350.T3.E1;
FPD350.T4.(E1/E2); FPD350.T5.(E1/E2);
FPD350.H7.E2; FPD350.H8.E2) or mark (Flanged
models FPD350.T3; FPD350.T4.(E1/E2) and
FPD350.T5.(E1/E2)) and align it correctly to the axis
of the pipe (angle X) according to the number of bolt
holes in the flange. Ensure it is perpendicular to the
pipe axis and square to the pipe plane.
b. Use suitable spacers
B
to raise the flanged pipe
fitting (stand-off) off the pipe to establish the
necessary gap for full-penetration welding.
c. Tack-weld at four points
C
midway between the
crotch and the skirt sections of the fitting.
d. Using a suitable piece of pipe, ensure the flanged
pipe fitting (stand-off) is correctly aligned with the
pipe (see Fig. 2.2, page 4) and concentric with the
hole.
e. Remove the spacers
B
.
f.
Apply a full penetration root run completely around
the base of the flanged pipe fitting (stand-off) at the
clearly defined weld preparation line
D
.
g. Make reinforcing welds at the crotch bevelled areas
E
of the flanged pipe fitting (stand-off) to provide
maximum weld at the crotch tapering to a minimum
at the skirt
F
.
Note.
This Section is applicable only to flanged Torbar
models.
Warning.
Step 2 is applicable only to flanged Torbar models
FPD350.(T3/T4/T5).(E1/E2) and
FPD350.(H7/H8).E2 that cannot be hot-tap
installed.
Before drilling into the pipe, reduce the pipe
pressure to a safe level and remove all hazardous
material
Flanged Torbar
Model
FPD350.T3
FPD350.T4
FPD350.H7
FPD350.T5
FPD350.H8
Hole size in mm (in)
16 (0.63)
28 (1.1)
65 (2.56)
Table 2.11 Hole Size
Note.
Every flanged pipe fitting (stand-off) is shaped to fit
the pipe and is self-aligning on two bolt holes as
standard.
Caution.
Weld only the bevelled portion of the
flanged pipe fitting (stand-off) to prevent the integrity
of the weld being compromised by any notch effect.
Fig. 2.17 Flanged Pipe Fitting (Stand-off) Installation
D
X
X
C
E
F
A
B
Pipe Axis
Hole
Pipe
Number of Holes in Flange Angle X in Degrees
4 hole
45°
6 hole
30°
8 hole
22.5°
