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Figure 3. Measurement J
E. Close tapping valve, bleed
pressure and remove drilling
machine.
WARNING: Vent pressure bleeder
valve away from work
area and personnel.
Stand clear of vent
when bleeder valve is
opened.
personal injury may
result from blowing
material.
3.2 Installation of the Plug
Installation of the plug is the
same for all four PIG-SIG types.
The nipple must be welded so
that it is on the centerline of the
pipe and perpendicular to it. The
unidirectional assembly may be
installed in any position around a
pipe oriented in any direction
relative to horizontal. The bi-
directional assembly must be
installed on top of a horizontal
pipeline.
When installing an indicator
Otherwise,
12
assembly on a plug assembly
already installed in a line, begin
with paragraph 4.3.
3.2.1 Preparation for Setting
the Plug
A. Extend
boring bar until retainer ring is
exposed.
B. Insert plug holder into boring
bar and install retainer spring.
See Figure 4.
Figure 4. Insert Plug Holder
C. Install plug assembly on plug
holder, aligning arrow on top
of plug with arrow on hex
drive of drilling machine.
(Figure 5). Balls in plug
holder must seat into plug
well.
Plug
positioned against plug holder
shoulder. Refer to Figure 6.
drilling
machine
must
not
be
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