TDW PIG-SIG V - Page 37

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Section IV – Pipeline Under Pressure
2.0 Continued
2.4 Installing the Drilling Machine
A. Apply thread paste (pipe dope) on the threaded
drilling machine adapter (Figure 4.18).
B. Install the drilling machine on the valve.
Flanged Valves: Install a new gasket.
C. Threaded Valves: Tighten the drilling machi
ne
as
sembly wrench-tight. Apply the pipe wrench t
o
t
he adapter only (Figure 4.19). Do not apply th
e
w
rench to the drilling machine.
D. Threaded Valves: Measure from the face of t
he
v
alve to the mark made on the adapter (Figur
e
4.
20). Record this as Measurement “G.”
E. Measurement “K” for the PIG-SIG V is alway
s
equa
l to 1-7/8 inches.
Figure 4.18. Apply Thread
Paste
Figure 4.19. Tighten
Drilling Machine
Figure 4.20.
Measurement “G”
NOTE
:
On all flanges above 500
-psi working pressure, use a new
Flex
-Type, Elastograph or equal gasket on all connections.
On
RTJ Flanges, use a new RTJ gasket.
⚠
CAUTION
Do not over-tighten the drilling
machine. Do not let the tapping valve
rotate during tightening.