Heat Shrink End Cap
Casing-to-Carrier Pipe Transition Sealing for Pre-Insulated Pipeline Joints
Product Overview
Our Heat Shrink End Cap is a high-shrink-ratio, heat-shrinkable sealing sleeve designed to provide a watertight seal at the transition between the casing pipe (outer jacket) and the carrier pipe (service pipe) on pre-insulated pipeline systems. Supplied in a wraparound configuration with a snap-fit closure and profile support skirting, it is specifically configured for sealing casing pipe ends at field joints, preventing moisture ingress into the insulation cavity.
The product is referenced against Canusa CSK-type specifications and is suitable for 6-inch (250 mm) gathering lines and 8-inch (219.1 mm) gas injection pipes in field joint applications.
Configuration
| Parameter |
Specification |
| Product Type |
Heat shrinkable closing ring / end cap |
| Configuration |
Wraparound with snap-fit closure |
| Supplied Size |
18" × 8" (project-specific) |
| Application |
Casing pipe end sealing at carrier pipe transition |
| Reference Product |
Canusa CSK type or similar |
| Suitable Pipe Sizes |
6" gathering (250 mm) and 8" gas injection (219.1 mm) |
System Function
In pre-insulated pipeline construction, the carrier pipe is insulated with polyurethane foam and protected by an outer casing (HDPE jacket). At field joints, the casing must be sealed at both ends to prevent groundwater and moisture from entering the insulation cavity. The Heat Shrink End Cap accomplishes this by:
Bridging the diameter transition between the larger casing pipe and the smaller carrier pipe
Shrinking down onto both surfaces under applied heat
Flowing adhesive to form a continuous, watertight bond at both the casing and carrier pipe interfaces
The result is a permanent seal that protects the thermal insulation from water ingress and maintains the long-term integrity of the pre-insulated pipeline system .
Construction
| Component |
Material |
Function |
| Backing |
Radiation cross-linked polyolefin |
High shrink ratio, mechanical protection, moisture barrier |
| Adhesive |
High-performance hot-melt adhesive |
Bonds to PE casing, steel carrier, and compatible coatings |
| Closure |
Snap-fit clips with insert holes |
Secure wraparound closure without separate patch |
| Profile Support |
Polypropylene skirting (supplied) |
Smooths the transition between casing and carrier pipe |
Key Features & Benefits
| Feature |
Benefit |
| High Shrink Ratio |
Accommodates the significant diameter difference between casing and carrier pipe |
| Snap-Fit Closure |
Rapid, accurate field installation without separate closure patch |
| Profile Support Skirting |
Eliminates the need for time-consuming filler mastic at the transition |
| Watertight Seal |
Prevents moisture ingress into the polyurethane insulation cavity |
| Flexible Adhesive |
Remains flexible after installation, resisting vibration, deflection, and thermal cycling |
| Canusa CSK-Compatible |
Interchangeable with the referenced product for project procurement |
| Suitable for Gas Injection Lines |
Rated for the service conditions of 6" gathering and 8" gas injection pipelines |
Application Sequence
Surface Preparation: Clean and abrade the casing pipe and carrier pipe surfaces; remove loose rust, dirt, and contaminants
Preheat: Preheat both casing and carrier pipes to approximately 50°C (120°F) to remove surface moisture
Install Profile Support: Attach the polypropylene support skirting to the casing pipe with fingers pointing toward the carrier pipe
Position Sleeve: Wrap the sleeve around the joint, centering the closure clips on the casing pipe edge; engage the snap-fit closure
Shrink Casing End: Apply heat circumferentially around the casing pipe until sleeve recovery is complete and adhesive oozes from the edge
Shrink Carrier End: Continue heating toward the carrier pipe until the sleeve conforms and adhesive flows at the carrier interface
Inspect: Verify complete recovery, absence of voids or wrinkles, and adhesive flow at all edges
Typical Properties (Reference)
| Property |
Typical Value |
| Backing Material |
Cross-linked polyolefin |
| Max Operating Temperature |
Up to 60°C (standard CSK-type) |
| Shrink Ratio |
High recovery (suitable for casing-to-carrier transition) |
| Adhesive Type |
Hot-melt, flexible after cure |
| Compatible Substrates |
PE, steel, epoxy, tapes, coal tar enamel |
| Seal Performance |
Waterproof, resistant to soil stress and thermal cycling |
Values are indicative based on CSK-type product data. Final values shall be confirmed against the specific product data sheet.
Primary Applications
Pre-insulated pipeline field joints — Casing pipe end sealing at carrier pipe transitions
6" gathering lines (250 mm) — Field joint sealing where casing-to-carrier transition protection is required
8" gas injection pipes (219.1 mm) — Sealing at casing ends to protect insulation integrity
District heating and hot water networks — End cap sealing for pre-insulated bonded pipe systems
Casing pipe transitions — Any application requiring a watertight seal between different pipe diameters
Packaging and Availability
Configuration: Wraparound sleeve with snap-fit closure, profile support skirting, and installation accessories
Size: 18" × 8" (project-specific; other sizes available on request)
Compatibility: Suitable for 6" and 8" pipe sizes as specified
Customization: Available to match project-specific casing and carrier diameters
For product data sheets, project-specific compliance certificates, or technical consultation, please contact our sales team.
Keywords: heat shrink end cap, casing seal, pre-insulated pipe joint, Canusa CSK compatible, gas injection pipeline, field joint sealing
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