Trenton Seal-Wrap
is a casing end-seal wrapper consisting of a heavy
woven glass coated with a butyl mastic of high
dielectric quality. It is wrapped around the end of the
casing and on the carrier pipe, and is then strapped
in place with stainless steel banding.
The Trenton Seal-Wrap system
was designed to enable field
personnel to readily replace existing "rubber-boot"
type end seals that are damaged prior to
installation of casing filler. Seal-Wrap can also be
used to reinforce existing "boot" or "compression"
type seals. This system also has advantages for new
construction. Seal-Wrap is a simple, efficient
method of sealing the annular space between pipe and
casing that does not necessitate absolute centering
of the pipe in the casing.
-
Clean
the pipe and casing ends with a wire brush to remove
loose rust, coating, and dirt. Then dry off all
surfaces.
-
Brush primer on all
metal surfaces to be covered with Seal-Wrap. Let dry
until tacky.
-
Place one layer of
double-faced adhesive approximately 6” in from the
end of the casing and 6” from the end of the casing
on the carrier pipe. This is the area where the
banding will be applied.
-
Apply one wrap of
Seal-Wrap around carrier and casing end. Remove the
paper backing from the material as you apply the
wrap. Allow a 6” overlap.
-
Band securely in place,
using one band and two buckles on both casing and
carrier in the middle of the double face adhesive
strips.
-
Cover buckles with a
small square of double-faced adhesive.
-
Apply a continuous
double wrap over the first wrap, making sure to
start the second wrap in a different position on the
pipe than the first wrap.
-
Place 2 bands on the
carrier, and 2 bands on the casing, either side of
the first bands.
-
Tighten all bands into
place, so they seat into the double-faced adhesive.
-
Let the seal cure
overnight.
-
Apply 5 psi into the top
vent, check for a strong airflow out the lower end
vent. This confirms there are no restrictions
between vents.
-
Then plug off the lower
end vent and pressure casing to 5 psi and monitor
for 15 minutes. If the air pressure holds the casing
is prepared.
-
If the casing is to
be filled it is highly recommended that the ends are
backfilled, this will help support the seals and
help stop any minor leaks.
