TDW PIG-SIG V User Manual

25
Section IV – Pipeline Under Pressure
1.0 Continued
1.3 Tapping the Line
A. Threaded Valves: Apply thread sealant to the
external pipe thread of the nipple and thre
ad
t
apping valve onto the nipple. The valve must
be
r
ated to at least line pressure, and must have
a
m
inimum through-bore of 2-1/16 inches to permit
passage of the TDW PIG-SIG V plug assembly.
Flanged Valves: Utilizing a new gasket, install
the valve on the flanged fitting; consider t
he
or
ientation of the valve. Keep the fitting-face an
d
V
alve-face parallel. Make sure not to damage the
gasket and that the gasket does not extend int
o
t
he bore of the valve.
B. For All Valves: After the valve has be
en
i
nstalled, check the nipple for swaging (distortion)
caused by possible over-tightening of the valve.
This can be done using a THREAD-O-RING
gauging tool if available. Otherwise, insert
a
dum
my plug without an O-ring through the valv
e
and
into the fitting. If the plug threads into the
fitting, the nipple has not been distorted. If it does
not turn, the fitting is distorted and will not accept
the threads of the PIG-SIG V plug.
⚠
CAUTION
If utilizing a threaded valve, do not
over-tighten the valve during
installation. Over-tightening can
swage the nipple diameter too small
to install the PIG-SIG V plug
assembly.
N
OTE:
O
n all flanges above 500-psi working pressure, use a new
Flex Type, Elastograph, or equal gasket on all connections.
On Ring
-Type Joint (RTJ) Flanges, use a new RTJ gasket.

TDW PIG-SIG V Specifications

General

Brand	TDW
Model	PIG-SIG V
Category	Measuring Instruments
Language	English