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Pipe Patch
Containment
If the packer will be placed such that portions of the
packer will be unsupported (such as T's or pipe damage
over 1" in diameter, connections, breaks, or the packer
extends into a larger size pipe or out of the drain) then
containment must be used. Additionally, if the pipe is
believed to be brittle (based on material, age, inspection
results, etc.), containment should always be used.
Containment can be done with a:
Containment Tube
• containment tube (for straight pipes)
Containment Liner
(Loop Stitch Material)
• containment liner (loop stitch material) (for use in
bends).
Figure 19 – Containment Examples
Containment reduces the risk of the patch bulging into
the unsupported area and/or the packer being damaged
or bursting. Containment is always done under the packer
sleeve and will be removed with the packer after the
patch is complete. Because the packer diameter is larger
than it normally would be, a pull rope may be needed to
pull the packer into place. Containment tube and liner
can be reused, but if it is, it should be inspected to make
sure that it is in good shape and not damaged.
Containment Tube
The containment tube is used for straight pipes when
containment is needed. Containment tubes can be used
at one end, both ends or over the full packer.
For Ends Only
Determine the containment tube length. At a minimum,
the containment tube should be at least 12" (305 mm)
long and must extend at least 4" (100 mm) under the
patch. If applying a patch less than full length, the tube
can extend more than 4" under the end of the patch, but
no less. See Figure 20.
14
Figure 20 – Minimum Containment Tube Length
1. Using sharp scissors, cleanly and squarely cut the
containment tube to length. A clean, square cut will
minimize tearing when inflating.
2. Place the containment tube over the packer, lining it
up with the end of the packer.
3. Place the packer in the middle of the width of the
tube. Fold the edges of the tube up and tight to the
packer. See Figure 21.
999-995-411.10_REV A
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