Naval DN 25, Руководство пользователя

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2. Preparations
2.1 Preparing the pipe and valve
Locate the exact point for the joint on the main pipe line and prepare the main pipe for welding of the
valve. Check the place of the joint on the main pipe (if the main pipe is a weld seam tube, avoid welding
the hot tapping valve on the weld seam).
Prepare the weld end of the hot tapping valve to match the radius (“R”) of the main pipe and taper the
edges as required for the best welding result (see figure 1).
The weld seam has to comply with the local requirements for size and strength. A support collar is to be
used when necessary.
NOTE: The threaded end of the valve may be prepared for welding or shortened only after
drilling through the main pipe.
Figure 1.