Heat-Shrinkable Sleeves for Cold-Climate Pipelines

Corrosion Protection for Field Weld Joints on Buried Pressure Pipelines | MDMT: –38°C

Our Heat-Shrinkable Sleeves are specifically engineered for the corrosion protection of field weld joints on buried pressure pipelines operating in the harsh cold-climate conditions of Central Asia. With a Minimum Design Metal Temperature (MDMT) of –38°C, the complete system is formulated to maintain flexibility, adhesion, and sealing performance at low temperatures—where standard heat-shrinkable materials may become brittle or lose adhesion.

Each system is supplied as a complete package including the heat-shrinkable sleeve, primer, closure patch, and all required accessories, ensuring that field crews have everything needed for a reliable, standards-compliant installation in remote Central Asian pipeline projects.

The complete system is designed to work as an integrated unit, with each component matched to the others for consistent performance at –38°C.

Values are indicative and shall be confirmed against the specific CNPetro product data sheet.

ISO 21809-3 specifies requirements for field-joint coatings on buried and submerged pipelines. Heat-shrinkable sleeves fall under Type 14 classifications, with performance requirements based on the maximum design temperature and system construction. For cold-climate applications, the system is tested to ensure adhesion, peel strength, and cathodic disbondment resistance are maintained at the –38°C MDMT.

Buried pressure pipelines in Central Asia – Field weld joint corrosion protection

Cold-climate pipeline construction – Where MDMT reaches –38°C

Oil and gas transmission lines – Onshore buried service

Remote field projects – Complete system supply for locations with limited access to spare parts

Pipeline rehabilitation – Restoration of damaged field-joint coatings in cold environments

Surface Preparation: Abrasive blast clean the steel cutback to Sa 2½ or equivalent; clean the adjacent plant coating overlap zone.

Preheat: Preheat the steel surface to the manufacturer’s recommended temperature (adjusted for –38°C ambient conditions).

Apply Primer: Mix two-component epoxy and apply to the prepared steel.

Position Sleeve: Wrap the heat-shrinkable sleeve around the joint, centering over the weld with equal overlap onto the plant coating.

Apply Closure Patch: Secure the closure patch along the overlap.

Shrink: Apply heat uniformly with a propane torch, working from the center outward, until the backing shrinks and adhesive flows.

Inspect: Verify complete shrinkage, adhesive flow, and absence of voids or lifted edges.