Steel Skeleton PE Composite Pipe for Water & Industry

Description

Steel Skeleton PE Composite Pipe

Steel skeleton PE composite pipe is a reinforced polyethylene pipeline that combines a welded steel-wire skeleton with polyethylene layers. This composite structure is designed to combine the corrosion resistance of polyethylene with enhanced mechanical strength, dimensional stability and impact resistance for selected industrial and infrastructure pipeline applications.

TPipes supplies steel skeleton PE composite pipe for project-specific applications, with nominal outside diameters listed from DN75 to DN630 in the supplied technical brochure. Available pressure ratings, material grades, operating temperatures and compatible fittings depend on the selected specification and intended service.

Composite Structure and Manufacturing Process

The pipe consists of a steel-wire reinforcing skeleton embedded within polyethylene material. According to the supplied Qinyi product brochure, the steel reinforcement uses ordinary low-carbon steel wire, while the polymer material is selected according to the intended service. The brochure identifies high-density polyethylene (HDPE) pipe-grade resin for general applications and medium-density polyethylene (MDPE) pipe-grade resin for designated gas-service products.

The manufacturing process includes steel-wire feeding, polyethylene extrusion, skeleton forming and composite sizing, cooling, haul-off, cutting and finishing. Integrating the reinforcing structure and polymer material during production helps create a composite pipe with consistent geometry and a balanced combination of rigidity and flexibility.

Key Features and Performance Advantages

• Corrosion resistance: Polyethylene provides resistance to many corrosive environments when the selected material is chemically compatible with the conveyed medium.
• Reduced scaling: The smooth polymer inner surface helps limit scale accumulation under suitable operating conditions.
• Enhanced mechanical strength: The steel-wire skeleton contributes to structural strength and resistance to deformation.
• Creep resistance: The composite structure is designed to improve long-term mechanical performance compared with an otherwise comparable unreinforced polymer structure.
• Impact resistance and dimensional stability: The steel-and-polymer construction combines rigidity with a degree of flexibility.
• Low thermal conductivity: The supplied brochure lists a thermal conductivity value of 0.43 W/(m·K).
• Low thermal expansion: The reinforced structure is designed to limit dimensional changes caused by temperature variation.
• Metal reinforcement detectability: The steel skeleton may assist pipe locating, subject to the detection equipment and installation conditions.

Typical Applications

Applications identified in the supplied product brochure include:

• Water supply and selected municipal infrastructure pipelines.
• Oil transportation and mixed-fluid transportation.
• Wastewater and industrial fluid conveyance.
• Designated gas transportation systems using an appropriate material grade and approved pressure rating.
• Selected corrosive-medium transportation applications following chemical compatibility assessment.
• Fire-protection or drinking-water applications only when the specific product, fittings and approvals satisfy the relevant project and regulatory requirements.

Application suitability must be evaluated against the conveyed medium, concentration, operating temperature, pressure, product grade, jointing system and applicable local requirements. The application list is not a blanket approval for every service.

Nominal Outside Diameter and Pressure Specifications

The supplied brochure contains a nominal outside-diameter series from DN75 to DN630. It lists nominal pressure classes of 1.0, 1.6, 2.0, 2.5 and 4.0 MPa for water, oil and mixed-fluid transportation, and 0.4 and 0.8 MPa for designated gas-service products. Availability varies by diameter and service category.

Nominal Wall Thickness for Water, Oil and Mixed Fluids

The following values are transcribed from the supplied technical chart. Wall thickness is expressed in millimetres; the notation in parentheses indicates the listed upper and lower tolerance in millimetres.

Nominal Wall Thickness for Designated Gas-Service Products

Specification note: These tables reproduce the nominal outside-diameter series in the supplied brochure. The original source should be checked against the current approved product specification before these dimensions are used for procurement or engineering design.

Ring Stiffness, Bending Radius and Support Spacing

The following values are listed in the supplied technical brochure. Final installation design should also consider the pipe specification, temperature, loading conditions, support design and applicable installation requirements.

Here, D represents the nominal outside diameter. These values are reference data from the brochure, not a substitute for project-specific installation calculations.

Operating Temperature and Pressure Derating

The brochure gives a general product operating-temperature range of -40°C to 80°C. Permissible pressure depends on the service, selected material grade and temperature. The following temperature correction factors are reproduced from the supplied brochure for reference.

These factors should be verified against the applicable current specification before calculating the permitted working pressure. The general temperature range must not be interpreted as approval for every medium or pressure class across the entire range.

Physical and Mechanical Performance

The supplied brochure lists the following test indicators:

• Longitudinal shrinkage after exposure to 110°C for one hour: less than 3%.
• Oxidation induction time at 200°C: greater than 20 minutes.
• Melt mass-flow rate change before and after processing at 190°C under a 5 kg load: less than 20%.
• Short-term hydrostatic testing includes conditions at 20°C for 100 hours and 70°C for 165 hours, with no leakage or rupture as the stated performance criterion.

Test values and acceptance criteria should be checked against the original test documentation and the applicable product standard before being used as contractual guarantees.

Chemical Compatibility

The brochure includes indicative chemical-resistance data at 20°C and 60°C. Examples are summarized below. S means good resistance, L means limited resistance and NS means poor resistance in the source chart.

This chart is indicative only. Chemical resistance depends on the exact polymer grade, concentration, temperature, exposure duration, mechanical stress and system design. Confirm compatibility before selecting the pipe for chemical service.

Technical Standards Referenced in the Brochure

The supplied brochure references the following Chinese industry standards:

• CJ/T 123-2016 — Steel Skeleton Reinforced Polyethylene Composite Pipe for Water Supply.
• HG/T 3690-2012 — Industrial Steel Skeleton Reinforced Polyethylene Composite Pipe.
• HG/T 3691-2012 — Industrial Fittings for Steel Skeleton Reinforced Polyethylene Composite Pipe.
• SY/T 6662.1-2012 — Steel Skeleton Reinforced Polyethylene Composite Pipe.

These are references cited in the supplied brochure, not a representation that every product configuration currently holds every listed certification. Confirm the applicable edition, product scope, test reports and market-specific approvals before procurement.

Request a Quote for Your Pipeline Project

TPipes can review your project requirements to help identify an appropriate pipe specification. Please provide the nominal diameter, conveyed medium, operating temperature, working pressure, required quantity, project location, applicable standard and any required fittings or connection details.

Contact TPipes to Request a Quote