Buying Guide

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84
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AHEAD OF THE FLOW
®
Revised 4/26/2019
2. A tapered plug
must be inserted
in the end of the
pipe to be thread-
ed. This plug pro-
vides additional
support and pre-
vents distortion of
the pipe in the
threaded area. Distortion of the pipe during the thread-
ing operation will result in eccentric threads,
non-uniform circumferential thread depth or gouging
and tearing of the pipe wall. See table below for approx-
imate plug O.D. dimensions.
Reinforcing Plug Dimensions*
These dimensions are based on the median wall thicknesses and average
outside diameter for the respective pipe sizes. Variations in wall thickness
and 0. D. dimensions may require alteration of the plug dimensions.
3. Use a die stock
with a proper
guide that is free
of burrs or sharp
edges, so that the
die will start and
go on square to
the pipe axis.
Threading Instructions for Thermoplastic Pipe (Continued)
Nominal Size Plug O.D.*
1/2 0.526
3
/4 0.722
1 0.935
1
1
/4 1.254
1
1
/2 1.476
2 1.913
2
1
/2 2.289
3 2.864
4 3.786
4. Push straight
down on the han-
dle, avoiding side
pressure that
might distort the
sides of the
threads. If power
threading equip-
ment is used, the
dies should not be
driven at high speeds or with heavy
pressure. Apply an external lubricant liberally when cut-
ting the threads. Advance the die to the point where the
thread dimensions are equal to those listed in the table
on Thread Dimensions on the previous page. Do not over-
thread.
5. Periodically
check the threads
with a ring gage
to insure that
proper procedures
are being fol-
lowed. Thread
dimensions are
listed in the table
on Thread Dimensions. The gauging tolerance is ± 1
1
/2
turns.
6. Brush threads
clean of chips
and ribbons. Then
starting with the
second full thread,
and continuing
over the thread
length, wrap
PTFE thread
tape in the direction of the threads. Overlap each wrap by
one half the width of the tape. Thread lubricant/sealant
may be used if approved by the manufacturer.