GE T17, Руководство по установке

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Chapter 2. Installing the Pipe Nozzles
38 Model T17 Installation Guide
2.4.1 Identifying the Nozzle Installation Kit Components - MR2 Mid-Radius (cont.)
Check the etched markings on the welding boss, as illustrated in Figure 47 below. The MR2 Mid-Radius path
designation , the pipe OD , the part number and the mounting angle are engraved on the bosses.
Figure 47: P/N 591-516 Welding Bosses for MR2 Configurations
2.4.2 Selecting and Marking the First Nozzle Location - MR2 Mid-Radius
CAUTION!
Before proceeding, be certain that these etched 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 flow meter.
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 - MR2 Mid-Radius” on page 53 ).
Scribe Line Aligns with Oblique Line Marked on Pipe