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MPP High Voltage Cable Protection Pipe

MPP High Voltage Cable Protection Pipe is a specialized conduit for power cable protection, manufactured using modified polypropylene (MPP) as the primary raw material via an extrusion process. The product features excellent electrical insulation, high-temperature resistance, impact resistance, and corrosion resistance. Primarily used for the protection of laid power cables, it is compatible with various installation methods, including open-trench laying and trenchless techniques such as directional drilling (pipe pulling) and pipe jacking. It is widely applied in sectors such as municipal power grids, telecommunications, highways, railways, bridges, industrial parks, and residential complexes. It effectively shields high- and low-voltage power cables from external damage and corrosion, ensuring safe and stable power transmission. With a service life exceeding 60 years, it is suitable for use with high-voltage lines (above 10kV) and cable duct banks, serving as an ideal alternative to traditional steel or PVC conduits.

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Product Overview

Core Product Advantages

Excellent Electrical Insulation: Features extremely high insulation resistance, effectively isolating the cable from soil and external conductors. This prevents safety hazards such as leakage and short circuits, ensures secure power transmission, and meets the protection requirements for high-voltage power cables.
High and Low-Temperature Resistance: Boasts a high heat deflection temperature and a long-term operating temperature range of -5°C to 95°C. It withstands heat generated during cable operation while remaining resistant to brittleness or cracking in low-temperature environments (-5°C), making it suitable for use across diverse climatic regions.
High Strength and Impact Resistance: Exhibits high thermal compression strength and excellent resistance to pressure and impact. It withstands soil pressure, external loads, and minor impacts during installation without deforming or breaking, making it ideal for the rigorous conditions of underground burial and trenchless installation.
Corrosion and Aging Resistance: Made from modified polypropylene, the material resists acids, alkalis, salts, and organic solvents, protecting against corrosive agents in the soil. UV stabilizers prevent chalking and aging during long-term outdoor use, eliminating the need for additional anti-corrosion treatments.
Convenient and Efficient Installation: Lightweight and easy to handle, the pipes can be joined via heat-fusion welding, creating secure, leak-proof connections. They are suitable for trenchless directional drilling, eliminating the need for extensive excavation or road surface disruption; this significantly shortens construction schedules and reduces costs while meeting eco-friendly construction standards.
Eco-friendly and Recyclable: Manufactured from virgin modified polypropylene, the material is odorless, non-toxic, and poses no risk of soil or groundwater contamination. The product is recyclable, aligning with green and sustainable development principles.
Smooth Inner Wall and Low Friction: Both inner and outer walls are smooth, with a friction coefficient of less than 0.35. This minimizes resistance during cable pulling, effectively protecting the cable sheath from scratches while facilitating future maintenance and replacement.

Product Specifications & Parameters

Key Specifications (Categorized by Type)

Nominal inner diameter(mm)	Wall thickness(mm)			Out of roundness(mm)
	Ring stiffness rating
	SN24	SN32	SN40
100	6	8	10	≤2.0
125	8	10	12	≤2.3
150	10	12	14	≤2.5
175	12	14	16	≤2.8
200	14	16	18	≤3.2
225	16	18	20	≤3.8
250	18	20	22	≤4.2
280	20	22	24	≤4.5
315	22	24	26	≤4.8
355	24	26	28	≤5.2

Note: Products with special specifications, ring stiffness, and lengths can be customized to meet customer requirements; parameters for export products can be adjusted according to regional standards to comply with the power engineering requirements of different countries.

Applicable Standards

Performance Parameters

MPP Raw Material: Density 0.91–0.95 g/cm³; tensile strength (23±2°C) ≥ 24.0 MPa; butt-fusion joint tensile strength ≥ 21.6 MPa.
Mechanical Properties: Flexural strength (23±2°C) ≥ 37.0 MPa; flexural modulus 900–1200 MPa; flattening test (D/2, -5°C): no rupture; falling-weight impact test (-5°C): 9 out of 10 samples show no rupture (5 kg × 2 m for D ≤ 125 mm; 6 kg × 2 m for D ≤ 160 mm; 10 kg × 2 m for D > 160 mm).
Thermal Properties: Vicat softening temperature (10 N, 50°C/h) ≥ 120°C; high heat deflection temperature, capable of withstanding short-term high-temperature exposure and meeting heat dissipation requirements during cable operation.
Electrical Properties: Insulation resistance ≥ 1.0 × 10¹² Ω·m; dielectric strength (breakdown voltage) ≥ 30 kV/mm; free of conductive impurities, ensuring electrical insulation safety.

Applicable Environmental Parameters

Operating Temperature: -5°C to 95°C; low-temperature resistant formulations available for special conditions (down to -20°C).
Operating Pressure: Non-pressure piping; primarily withstands soil pressure, external loads, and construction-related impact forces.
Burial Depth: Standard type ≤ 8 m; reinforced type ≤ 15 m (adjustable based on ring stiffness class; special depths require specific engineering design).
Application Scenarios: Municipal power conduit systems; cable protection for highways and railways; cable laying in industrial parks; trenchless crossing projects (under roads, rivers, or buildings); and areas where excavation is prohibited, such as heritage sites and protected agricultural zones.

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