Name: steel frame polyethylene (PE) plastic composite pipe, referred to as SRPE pipe is a new type of high-tech, environmentally friendly pipe;

High-strength low-carbon steel mesh structural layer as the reinforcing skeleton, high (medium) density polyethylene as the matrix, in the production line through continuous extrusion composite molding.

Steel skeleton polyethylene plastic composite pipe combines the corrosion resistance of plastic with the strength of steel as a whole, with excellent flexibility, suitable for long-distance buried water supply, gas supply piping system, is the current domestic replacement of cast iron pipe, steel pipe and other traditional pipeline products.

Steel skeleton plastic composite pipe

Synthesis Principle

Advantages of steel

Strength of steel: 235MPa; strength of PE is about 22-25MPa.

The strength of steel is 10 times of the strength of PE.

Modulus of elasticity of steel: 205,000MPa; PE modulus of elasticity: 800-1000MPa

The modulus of elasticity of steel is 200 times that of PE.

Product specification

Product Profile III--Pipe Fittings

Fitting structure: The fittings are also reinforced with steel skeleton. The steel skeleton is made of punched and coiled welded low carbon steel plate. The steel skeleton and polyethylene base material are compounded together in a structural way, the compound is uniform and reliable, and will not crack.

Manufacturing process: injection molding process

Raw material: Pipe-grade polyethylene PE63 or PE80, low carbon steel sheet

Pipe Fitting Type

Performance Advantages

Good creep resistance, high lasting mechanical strength

Good temperature resistance

Good rigidity and flexibility (rigid-flexible)

Good flow-through ability

Good abrasion resistance

No fast cracking

Uniform and reliable composite of steel and plastic materials

Anti-corrosion on both sides

Good self-traceability

1、Good creep resistance, high lasting mechanical strength

Pure plastic pipe permissible stress and pressure capacity is very low

Steel in the plastic use temperature range of stability, not creep

Steel skeleton can effectively constrain the creep of plastic, so that the lasting strength of the plastic itself is also greatly improved.

Steel skeleton plastic composite pipe pipe permissible ring stress than the plastic pipe increased nearly 1 times.

Long-term hydrostatic strength test creep data comparison

(Steel skeleton plastic composite pipe, pure PE80, PE100 pipe)

2、Good temperature resistance

Every 10℃ increase in temperature, the strength of pure plastic pipe is reduced by more than 10%; while under the same conditions, the strength of steel skeleton plastic composite pipe is reduced by less than 5%.

2, good temperature resistance (continued)

Tubing at different temperatures down pressure coefficient

3、Rigid and flexible

Moderate bending to adapt to the needs of the terrain

The spiral winding structure of the mesh steel skeleton is a flexible structure in the axial direction, which makes the composite pipe have the characteristics of radial rigidity, axial flexibility and rigid-flexible.

Rigidity, good impact resistance; moderate flexibility, can effectively withstand sudden impact loads caused by soil settlement, slippage, vehicles, etc.; deflection is 80-120 times of the diameter;

Resistant to earthquakes and uneven settlement of terrain.

4、Strong flow capacity

The roughness of steel pipe wall is between 20-50um

Steel skeleton plastic composite pipe wall roughness between 0.22-0.47um

According to the results of hydraulic calculation done by the organization:

The conveying capacity of steel skeleton plastic composite pipe is

Increase the conveying rate by 20%-30% than the same specification steel pipe;

Improve 25-35% conveying rate than the same specification cast iron pipe;

Steel skeleton plastic composite pipe does not scale, wax, flow resistance coefficient is basically unchanged

5, good wear resistance

Chemical pipe five forms of damage: corrosion damage, fatigue damage, creep damage, scouring wear and tear thinning damage and brittle damage;

In the water velocity of 7-8m / s and water temperature 30 ℃ -35 ℃ sand-containing 15% of the water.

Tests are carried out with SPE pipes and steel pipes with a diameter of 50 mm:

- Steel pipe abrasion 4mm/1000h, SRPE pipe abrasion 4mm/1600h

- Abrasion 4mm/1000h for steel pipe and 4mm/1600h for SRPE pipe.

At the standard speed of 15 ft/s, the service life of the PE pipe is 3 to 5 times longer than that of the commonly used fine grain steel pipe.

6、Good anti-cracking performance

Steel wire mesh and polyethylene two materials belong to the structure of the composite, constitute the structure of the steel wire mesh itself is a discontinuous structure, theoretically there is no crack fast propagation conditions.

PE in the pipe working pressure up and down the stress level is very low, for about 0.6MPa, so its fast cracking safety margin than pure PE pipe is also 1.57 times higher, there is no fast cracking problem.

The Becetel Laboratory in Belgium tested the fast cracking resistance of Dn150 pipe according to ISO13477. Due to the limitation of pure plastic pipe, the test can only be carried out up to 1MPa, so the limited test result obtained is that the critical pressure is higher than 1MPa (stress 6.75MPa). This result is nearly five times higher than the critical pressure value of PE80-SDR11 gas pipe of similar specification.

7、Composite uniform and reliable

Steel skeleton PE composite pipe steel skeleton is mesh structure, and plastic intertwined, composite stable and reliable;

Steel skeleton PE composite pipe is not a homogeneous material, the two materials can not reach a critical pressure at the same time;

Steel wire itself is a discontinuous structure, theoretically there is no crack rapid propagation conditions;

Steel-plastic two materials modulus of elasticity has a big difference, pipe bearing, plastic stress level is 1/10 of the permissible pressure, theoretically has a strong resistance to fast cracking ability.

8. Good self-tracing

The steel skeleton makes the buried steel skeleton PE composite pipe can use the usual magnetic detection method to find and locate, avoiding the damage caused by other excavation works.

Raw Materials

High-strength low carbon steel wires and perforated steel sheets produced by large steel mills

Steel wire composition requirements

Mechanical properties of steel wire mesh requirements

Raw material

Polyethylene resin:

- PE80 grade medium and high density polyethylene;

- PE100 grade high-density polyethylene pipe special material.

Polyethylene pipe special material performance requirements:

Technological process

Steel skeleton polyethylene composite pipe adopts continuous winding, welding into steel mesh skeleton, and plastic melt extrusion synchronous composite molding process. That is, low carbon steel wire as the reinforcing phase, polyethylene (PE) as the substrate, through the molding machine will be welded into a network of steel wire, and molten polyethylene in the composite head for composite extrusion, after cooling, hauling, cutting, sealing, and then formed into a product pipe.

Areas of application

Connection Method

Bury

overhead laying