OEM Wrap Around Sleeves Supplier & Factories

Global Pipeline Integrity Systems, Corrosion Prevention Technologies & Custom Infrastructure Solutions

Establishment, Innovation & Structural Leadership

Understanding CYCT's heritage as an industry pioneer since 2000, powering critical energy pipelines globally.

Founded in 2000, CYCT New Materials Company Limited (CYCT) has developed into a state-level high-tech enterprise. We seamlessly integrate the research & development, manufacturing, and distribution of premium pipeline corrosion protection materials. Beyond standard material logistics, CYCT offers specialized structural pipeline detection services and high-integrity coating field application services. Decades of research have cemented CYCT's reputation as a reliable development partner for critical national and international pipeline networks.

"Operating as an essential supplier for energy conglomerates like PetroChina, Sinopec, PipeChina, and national municipal grids, CYCT focuses on developing customized field joint coatings (FJCs) that mitigate localized galvanic corrosion, thermal deformation, and heavy mechanical shear forces."

Our infrastructure matches our scientific focus. CYCT hosts a national CNAS-accredited laboratory, enabling our professional engineering teams to perform real-time verification checks on shear strength, peel capacity, cathodic disbondment resistance, and temperature-cycle tolerances. This scientific framework has led to the design of visco-elastic coatings, high-performance photo-curing sleeves for Horizontal Directional Drilling (HDD), and advanced polyurea configurations.

2000
Year Established
CNAS
National Accredited Lab
10+
Proprietary Patents
AMPP
Active Corporate Member

Macro-Industry Corrosion Prevention & Global Logistics

Providing custom wrap-around sleeves engineered to defend midstream oil & gas assets from challenging climates.

1. Field Joint Integrity: The Structural Baseline

In international pipeline construction, the field joint—where individual segments of steel pipe are welded together—represents the area most susceptible to corrosion. While main pipe bodies receive robust factory coatings like 3-layer polyethylene (3LPE) or 3-layer polypropylene (3LPP), field welds must be insulated on-site. Wrap-around heat-shrinkable sleeves serve as the primary protective barrier, keeping moisture, oxygen, and electrolytes from reaching the steel surface.

2. Adapting to Diverse Geological Climates

Global infrastructure networks cross extreme terrain. Pipelines in desert environments undergo high thermal cycling, with surface temperatures shifting from below freezing at night to over 80°C during the day. In arctic regions, soils exert high shear stress on coatings during freeze-thaw cycles. Marine configurations face constant exposure to salt water and mechanical wave action. Resolving these challenges requires customized formulations that match backing stiffness and adhesive shear resistance to localized geotechnical conditions.

3. Sourcing and Technical Alignment

Procuring field joint materials from qualified OEM factories ensures consistent material performance. Industrial buyers look for suppliers who provide comprehensive engineering support, from raw material sourcing to final installation training. A reliable factory maintains tracing for batch numbers, backing thicknesses, adhesive density, and cross-linking indices. This level of quality control is essential for pipelines built to operate for 30 to 50 years.

Advanced Adhesive Science

Formulated with copolymer adhesives and viscoelastic bases that bond tightly to steel surfaces and factory coatings, preventing water ingress and cathodic disbondment.

Cross-Linked Polyolefin Backing

Radiation cross-linked polymers provide elastic memory, shrinking tightly during installation to resist soil stress, structural movement, and mechanical impact.

CNAS & ISO Validation

Every production run is verified inside CNAS laboratories, ensuring compliance with international pipeline standards like ISO 21809-3 and EN 12068.

Localized Applications & Environmental Protection

Tailored coating technologies designed to withstand specific geotech challenges and structural requirements.

1. Horizontal Directional Drilling (HDD) Protection

Installing pipelines beneath rivers, highways, or structures using Horizontal Directional Drilling subjects coatings to extreme friction and shear stress. Standard heat-shrink sleeves can peel or tear during the pull-back process. CYCT's Photo-Curing GRP Protective Sleeves create a hard outer shell that shields underlying corrosion coatings from sharp rock edges, soil abrasion, and installation friction.

2. Offshore & Subsea Splash Zone Safeguards

Subsea field joints are exposed to high saline levels and oxygenated sea water in tidal splash zones. CYCT's GRF Moisture Curing Shields provide robust anti-corrosion protection in marine environments. These shields cure in moist environments, forming a tight barrier that resists cathodic disbondment and mechanical wave action.

3. High-Temperature & High-Stress Pipelines

Lines carrying hot crude oil or gas operate at high temperatures, often reaching 85°C to 120°C. Standard adhesives can soften at these temperatures, leading to sagging and sliding under soil load. CYCT high-temperature PP heat shrink sleeves use specialized polypropylene backings and cross-linked hot-melt adhesives to maintain mechanical properties and bond strength at elevated temperatures.

HDD Crossing protection

Uses GRP photo-cured reinforcement wraps to protect pipelines against mechanical friction and aggregate shear during deep pullbacks.

Subsea Wet Joints

Moisture-curing composite wraps protect joints in submerged marine zones, resisting constant wave action and high salinity.

Desert Gas Lines

Polypropylene-based shrinkable systems resist thermal expansion, high temperatures, and shifting soil friction.

Urban Mainlines

Viscoelastic self-healing systems provide long-term corrosion protection in high-consequence municipal areas.

Technology Roadmap & Future Outlook

Developing next-generation protective coatings with smart materials and reduced carbon footprints.

The field joint coating industry is moving toward smarter, faster-curing, and more environmentally friendly materials. CYCT's development roadmap focuses on addressing these industry trends:

1. Self-Healing Viscoelastic Systems

Standard coatings can permit moisture ingress if punctured. Viscoelastic materials address this through cold-flow properties. These sealants flow into scratches or cracks to self-heal damage, maintaining a continuous barrier against water and oxygen.

2. UV & Photo-Curing Composites

Photo-curing systems cure rapidly under sunlight or UV lamps, accelerating field installation. They require no open flames, simplifying field joints on offshore barges and in high-consequence pipeline areas.

3. Solvent-Free & Lower VOC Primers

Older wet primers release volatile organic compounds (VOCs) that present safety hazards in confined pipeline trenches. CYCT's solvent-free liquid epoxy primers protect steel surfaces without releasing hazardous fumes, improving safety during field application.

Certified Quality & Corporate Credentials

A trusted supplier to PetroChina, Sinopec, PipeChina, and international pipeline networks.

CYCT is a council member of the Chinese Society for Corrosion and Protection (CSCP) and an active corporate member of AMPP. Our facility holds certifications for pipeline inspection and specialized anti-corrosion application. As a registered supplier for major energy networks, CYCT maintains the following credentials:

In addition to our operational infrastructure, CYCT holds various national and product certificates, establishing reliability across international supply chains:

Expert Engineering FAQ

Technical guidance on selecting, installing, and testing pipeline wrap-around heat-shrinkable sleeves.

Q1: What is the differences between 2-layer (2L) and 3-layer (3L) wrap-around sleeve systems?
2-layer systems consist of a heat-shrinkable backing coated with a mastic or hot-melt adhesive. The adhesive bonds directly to the prepared steel surface and the adjacent factory coating. 3-layer systems add a liquid epoxy primer applied to the bare steel before placing the sleeve. The hot-melt adhesive bonds to the wet or cured epoxy, creating a 3-layer configuration similar to factory 3LPE coatings, which provides higher resistance to cathodic disbondment.
Q2: How do you prevent soil stress failure in warm climates?
Shifting soils exert shear stresses on buried pipelines, which can cause soft mastic adhesives to slide or buckle. In warm climates or high-temperature pipelines, engineers specify polypropylene-based backing materials or high-shear-strength hot-melt copolymer adhesives. These materials retain their structural properties and resist displacement under geotechnical loads.
Q3: What substrate preparation is required before installing wrap-around sleeves?
Proper surface preparation is essential for adhesive performance. The steel pipe must be cleaned to a Sa 2.5 near-white metal finish or St 3 power-tool finish, depending on the system. The pipe profile should range between 50 to 75 microns to ensure mechanical bonding, and the substrate must be preheated with an induction coil or propane torch to the temperature specified by the manufacturer (typically 60°C to 110°C) to prevent cold joints.
Q4: Why is Cathodic Disbondment (CD) testing important for pipeline coatings?
Cathodic protection (CP) prevents corrosion at coating voids by applying an electrical current. However, this current can cause the coating adhesive to disbond over time. Cathodic disbondment testing measures a sleeve's resistance to this chemical and electrical peeling. Systems with low CD ratings (smaller disbondment radii) provide more reliable protection in systems where active CP is applied.
Q5: How do photo-curing GRP sleeves protect pipelines during HDD installations?
Horizontal Directional Drilling pulls pipelines through bored holes, exposing them to abrasive soil and rock. Glass reinforced plastic (GRP) sheets are wrapped over the corrosion protection sleeve. Under sunlight or UV exposure, the GRP cures into a hard outer shell that absorbs mechanical impacts and protects the underlying corrosion barrier during installation.