Seal-Wrap™ is a casing end-seal wrapper consisting of a heavy woven glass coated with a butyl mastic of high dielectric quality wrapped around the end of the casing and on the carrier pipe. It is then strapped in place with stainless steel banding.
The Seal-Wrap system was designed by the Trenton Corporation 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 applications. 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.
- With a wire brush, clean the last 12” of the casing pipe ends and the first 12” of the carrier pipe to remove loose rust, coating, and dirt. Dry off all surfaces.
- Brush Seal-Wrap Primer onto the cleaned areas of the carrier and casing to be covered with Seal-Wrap. Let dry until tacky.
- Place one layer of Double-Faced Adhesive at the edge of the casing and one layer approximately 4” from the end of the casing on the carrier pipe. Remove release paper from the Double-Faced Adhesive. This is the area where the banding will be applied.
- Measure around outside circumference of the casing to determine length for a single wrap of Seal-Wrap, then add 6″ to ensure that Seal-Wrap is cut long enough to allow for a 6″ overlap. Apply one wrap of Seal-Wrap around the carrier and casing end. One edge of the Seal-Wrap should be aligned with the farthest edge of the Double-Faced Adhesive on the casing. Remove release paper as you apply the Seal-Wrap.
- Band securely in place, using one band and two buckles on both casing and carrier in the middle of the Double-Faced Adhesive. Use the banding tool to tighten bands until flush with the surface of the Seal-Wrap, then tighten both buckles with the supplied hexagonal wrench.
- Cover buckles with small squares (approx. 6” square) of Double-Faced Adhesive to prevent cutting of next layer. Remove release paper from Double-Faced Adhesive.
- Apply a continuous double wrap of Seal-Wrap directly over the first wrap, making sure to start the second wrap in a different position than the first. Remove release paper as you apply the Seal-Wrap. (To determine the length of Seal-Wrap, double the casing circumference, then add 6” for overlap.)
- Apply one wrap of Double-Faced Adhesive centered over the edge of the casing end and one wrap centered over the edge where the Seal-Wrap meets the carrier pipe. Do not remove release paper from the Double-Faced Adhesive.
- Place two bands on the carrier pipe on either side of the first band. The band closest to the end of the casing should be over the Double-Faced Adhesive applied in Step 8.
- Place two bands on the casing pipe on either side of the first band. The band closest to the end of the casing should be over the Double-Faced Adhesive applied in Step 8.
- Tighten all bands into place so they seat securely into the Double-Faced Adhesive and Seal-Wrap.
- Let the seals cure overnight.
- Apply up to 2 psi into top vent, then check for a strong airflow escaping out the lower end vent. This confirms there are no restrictions between vents.
- Close off the lower end vent, pressure casing to up to 2 psi, and monitor for 15 minutes. If any air pressure holds, the test is complete and the casing is prepared. It is highly recommended to backfill before testing above 2 psi.
- If casing is to be filled with wax, it is highly recommended/critical that the ends of the casing are backfilled. The backfill will help support the seals, and help stop any minor leaks.
- Carrier does not have to be centered in the casing.
- Covers any size casing up to 42″.
- Ideal for preparation of casing for filling.
- Can be installed on existing pipe.
|Composition||Fiberglass fabric coated with butyl mastic|
|Dielectric Strength||300 volts/mil|
|Water Absorption||.03 %|
|Quick-drying butyl mastic primer|
|Composition||Butyl and synthetic resin|
|Dielectric Strength||300 volts/mil|
Material Requirements for One Casing End
|Casing Diameter||Double-Faced adhesive (feet)||Need to split in two||Stainless Steel Band 9(feet)|