TDW PIG-SIG V, Operating And Maintenance Instructions Manual

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Section IV – Pipeline Under Pressure
1.0 THREAD-
O-RING Nipple
Installation
1.0 THREAD-O-RING NIPPLE INSTALLATION
1. 1 Tapping Requirements
Figure 4.1.
Brush Threads
A. A THREAD-O-RING nipple can be welded to the
pipeline then tapped through, using a T-101
drilling machine and a 1-7/16-inch drill.
B. The nipple must be welded so that it is on the top
centerline of the pipe and perpendicular to it.
⚠ CAUTION
The PIG-SIG V plug assembly can
be damaged and may not operate
properly if the THREAD-O-RING
nipple is not installed correctly or if
the opening in the pipe is too small.
⚠ CAUTION
Clean the threads of the THREAD-O-
RING nipple before installing the
PIG-SIG V plug. The plug threads
may gall and/or be damaged if debris
is not removed prior to installation
(Figure 4.1).