MPP power cable protection pipe, MPP power pipe

Excellent insulation performance: can effectively protect the cable, prevent electrical short circuit.

High temperature resistance and corrosion resistance: can maintain stable performance in high temperature environment, and at the same time resistant to chemical corrosion.

High mechanical strength: high compressive and impact resistance.

Convenient construction: light weight, quick installation, can be connected by hot fusion welding and other methods.

Good environmental performance: the material is pollution-free and has a long service life

1. Lightweight, making it easy to transport and install; it has good flexibility, making installation convenient and cost-effective. It is recyclable, meeting environmental standards; when the pipe bends, the stress in the bent section can be quickly relieved, preventing 'rebound' and simplifying construction operations, thus avoiding damage at the bend due to stress concentration during use;

2. Small friction loss in the pipe, the conveying fluid capacity of the pipeline is 10% larger than that of PE-X pipe with the same diameter; the impact resistance is twice that of PE-X pipe material;

3. The low fracture temperature and excellent low-temperature performance of the pipe material make it possible to be constructed in winter under low temperature conditions, and no preheating is required when bending the pipe, which can solve the economic losses caused by the inability to construct in northern China due to the low temperature in winter. The minimum bending radius is 5 times of the outer diameter of the pipe;

4. Good chemical corrosion resistance, no rust, long service life. Generally, after several years of use, the inner wall of the steel pipe becomes rough due to serious corrosion, and the flow resistance increases, thus greatly reducing the water transmission capacity; under the working temperature of 70℃ and pressure of 0.82MPa, the pipeline can be safely used for more than 50 years;

5. Good creep resistance, the creep of PE-RT pipe changes with the change of temperature, PE-RT does not need cross-linked plate due to special raw materials, once formed after production, the creep is permanent;

6. No toxic additives are added in the production process of pipe materials, smooth inner wall, no scaling, no bacterial growth, can be safely used in drinking water transmission and other fields;

7. Good heat dissipation performance, thermal conductivity is 0.4W/(m•K), can save a lot of energy in heating applications, so PE-RT can give full play to its excellent characteristics in the field of heating;

8. Weldability: After the system pipeline is damaged, it can be plugged with hot fusion welding or electrofusion welding

MPP cable protection pipe integrates environmental protection, health, sealing, anti-corrosion, shockproof, high quality, low price, simple construction and other advantages. It has good economic and social benefits in the field of electric power, and has a wide application prospect.

The following are the main welding methods and operation points of MPP power threading pipe:

Hot melt welding (most commonly used)

1. Preparation
Clean the end face of the pipe and use alcohol to remove oil, moisture and impurities.
Check the welding machine power supply, hydraulic oil and heating plate status, and set the temperature to 200-225℃ (increase appropriately when the temperature is low).
After the pipe is fixed, the end face is milled to ensure that the misalignment is ≤ 10% of the pipe wall thickness.

‌2. Heating and docking‌
After the heating plate reaches the required temperature, quickly put the pipe in and pressurize it to create a flange on the end face (the flange height must meet the required temperature).
After maintaining pressure and absorbing heat for 2 minutes, the plate is quickly removed and the pipe ends are butt-jointed without rotation within a limited time (usually 5-10 seconds).
After docking, apply steady pressure and allow natural cooling for ≥ 20 minutes. Forced cooling is prohibited.

Electrofusion welding

1. Parameter matching
Scan the barcode of the electric fusion sleeve to automatically obtain the welding machine parameters (voltage, time).
Remove impurities from the joint and ensure that the gap between the pipe and the sleeve is uniform.

2. ‌Welding process‌
Start the welding machine and monitor the voltage fluctuation throughout the process. The process ends when the melting status indicator light goes out.
Do not move the pipe during the cooling period.

Other connection methods

1. Socket connection
The rubber seal needs to be positioned accurately and tapped into place with a mallet to prevent damage.
Check the sealing regularly, suitable for low pressure scenarios.

2. Flange connection
The bolts need to be tightened symmetrically and evenly, and the matching metal parts should be hot-dip galvanized for corrosion protection.
Suitable for large pipes that need to be disassembled frequently.

General precautions

Environmental control: When the ambient temperature is below -5℃ or there is strong wind, thermal insulation protection is required.

Quality inspection: After welding, check the flatness of the weld to see if there are bubbles or cracks; perform pressure test if necessary.

Safe operation: Avoid pinching during hot melt butt welding, and personnel need professional training

Summary of MPP power cable protection pipe specifications and models

Its specifications and models are mainly distinguished according to the outer diameter, wall thickness and length. The following is a detailed classification of common specifications:

1. Combination of outer diameter and wall thickness

DN90mm
Wall thickness: 5mm, 6mm

DN110mm
Wall thickness: 6mm, 7mm, 8mm, 9mm, 10mm

DN160mm
Wall thickness: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm

DN180mm
Wall thickness: 10mm, 12mm, 15mm

DN200mm
Wall thickness: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm

DN225mm
Wall thickness: 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 18mm

DN250mm
Wall thickness: 13mm, 14mm, 15mm, 16mm, 17mm, 20mm

2. Length specification

Common single pipe length is 6 meters, 9 meters, 12 meters.

3. Classification and application scenarios

Excavation type: suitable for conventional cable laying projects.

Non-excavation type (pipe jacking/pull pipe): used for cable protection in special sections such as roads, railways and riverbeds without large-scale damage to the ground.

Suggestions for selection:

Small diameter (such as DN90mm, DN110mm) is mainly used for general cable laying, wall thickness is relatively thin;

Large diameter (such as DN200mm and above) is suitable for ultra-high voltage cables or complex environments (such as crossing roads), and a larger wall thickness should be selected to enhance the pressure bearing capacity.

4. Connection mode

The connection mode of MPP cable protection pipe is also part of its specifications. Common connection modes include socket connection, hot fusion connection, electric fusion connection, etc. Different connection modes are suitable for different application scenarios and engineering requirements, and choosing the appropriate connection mode can ensure the safety and reliability of cable pipeline.

When selecting MPP cable protection pipes, it is essential to consider the specific project requirements, construction conditions, and the specifications and characteristics of the cables, ensuring that all specifications are compatible. Additionally, to ensure the quality and safety of the cable pipes, it is crucial to choose reputable manufacturers and high-quality products. During the construction process, it is necessary to follow relevant construction standards and technical requirements to ensure the installation quality and effectiveness of the cable pipes.

In short, MPP cable protection pipe has a variety of specifications, and the selection of appropriate specifications and connection mode is very important for cable protection. In practical application, it is necessary to consider and choose comprehensively according to the specific situation to ensure the safety, reliability and economic practicality of cable pipeline.