GE T17, Руководство по установке

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Chapter 2. Installing the Pipe Nozzles
6 Model T17 Installation Guide
2.2.1 Identifying the Nozzle Installation Kit Components - Diametrical (cont.)
Check the etched markings on the welding boss, as illustrated in Figure 5 below. The diametrical path code , the pipe
OD and the mounting angle are engraved on the bosses.
Figure 5: Welding Boss Etching
2.2.2 Selecting and Marking the First Nozzle Location - Diametrical
CAUTION!
Before proceeding, be certain that these values match your intended installation and
that the etched markings are the same on both bosses
CAUTION!
Correct nozzle alignment is critical to the accurate operation of the Flowmeter. Therefore,
all marking, positioning and welding operations must be carried out with the utmost attention to
accuracy. The centerline of each nozzle must form an angle of
45° ±1°
with the centerline of the pipe.
The centerlines of the two nozzles must form an angle of
180° ±1°
with each other, and the points
where the two nozzle centerlines intersect the pipe centerline must be within
±1/16” (±1.6 mm)
of
each other. When the nozzle installation is complete, the raised faces of the two flanges must be
parallel to each other.
WARNING!
All hole cutting in live process piping must be performed using
hot tapping
equipment
(see “Hot Tapping the Pipe - Diametrical” on page 17 ).
Code for Diametrical Path
Pipe O.D.
Mounting
Angle