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Steel mesh skeleton plastic (polyethylene) composite pipe

In the past 20 years, new plastic pipes have been widely used in municipal, gas, power plant water intake and other fields. Especially with the continuous optimization and innovation of polyethylene polymerization technology, polyethylene materials with higher and higher tensile strength have emerged. The range of pressure grades used for plastic pipes has been expanded, especially in recent years, through the research of interdisciplinary technology, the introduction of steel-plastic composite technology has satisfactorily solved the problems of polyethylene (PE) pipes in terms of pressure grades, anti-corrosion, and effective flow caliber. , for a wider range of fluid conveying applications. Structure: This product uses the core layer of the coated high-strength steel wire as the reinforced skeleton, and uses special hot-melt adhesive and plastic to form a pipe by extrusion molding.

Key words

long lasting

Long service life, under standard conditions, the product can be used safely for at least fifty years.

Ultra high strength

Good toughness, even if the pipeline is severely deformed, it is difficult to break, and the seismic performance is very good.

Environmentally friendly and non-toxic

Non-toxic, safe and hygienic, polyethylene itself is a non-toxic and renewable material that will not pollute the environment.

preservative

It has good corrosion resistance, a wide range of corrosion-resistant media, and excellent product performance.

Easy to construct

The pipeline is light in weight and can be bent, with excellent construction performance and low construction cost.

good sealing

Using the electrothermal fusion method, the pipe and the pipe fittings are fused together, so that the pipe joint does not leak and has good sealing performance.

smooth inner wall

The inner wall is smooth and non-scaling, the conveying resistance is small, and the water conveying capacity of the same inner diameter is 30% higher than that of the steel pipe.

durable

Good fast crack growth and slow crack growth transfer resistance, more durable.

project			index
Hydraulic test	Water supply series	Temperature: 20℃; Time 1h; Pressure: Nominal pressure x 2	No rupture, no leakage
		Temperature: 60℃; Time 165h; Pressure: Nominal pressure x 1.2
		Temperature: 60℃; Time 1000h; Pressure: Nominal pressure x 1.1
burst pressure test	Water supply series	Temperature: 20℃; burst pressure ≥ nominal pressure x 3.0	blasting
Thermal stability (200℃) min			>20
Weather resistance (after the pipe has received 23.5GJ/m2 of aging energy)			Meet the hydraulic test requirements of this standard and maintain good welding performance.

Nominal pressure correction factor

temperature t/°C	0≤t≤20	20≤t≤30	30≤t≤40	40≤t≤50	50≤t≤60	60≤t≤70	70≤t≤80
Correction factor	1	0.95	0.9	0.86	0.81	0.76	0.71

Peel strength: should be tested in accordance with the test method specified in GB/T32439-2015, peel strength value ≥ 150N/cm

Performance comparison table of steel mesh reinforced polyethylene composite pipe and steel pipe and ductile iron pipe

Contrast	material	Hygiene/Environmental	Corrosion resistance	Pressure/Shock Resistance	hydraulic properties
Steel mesh skeleton plastic (polyethylene) composite pipe	High density polyethylene, high strength steel wire (HDPE/ST)	Green	It has double-sided anti-corrosion properties, good acid resistance, alkali resistance, chemical corrosion resistance, and excellent soil electrochemical corrosion resistance.	The pressure bearing capacity of the composite pipe far exceeds that of the pure plastic pipe and is close to that of the steel pipe.	No scaling on the pipe wall, strong flow capacity
Steel Pipe	Steel (ST)	There is secondary pollution, easy to rust	Difficult anti-corrosion treatment, poor local anti-corrosion performance; high cost of anti-corrosion engineering	Good pressure resistance	The inner wall is rough, the water resistance is large, and it is easy to scale and cause the flow capacity to decrease.
Ductile Iron Pipe	Iron (ST)	Easy to breed bacteria, easy to produce "yellow water" phenomenon	Need to do lining and anti-corrosion treatment, poor anti-corrosion performance	Poor impact resistance	The tube wall is rough and the relative flow capacity is poor

Connection and sealing performance	Monomer quality	construction period cost	thermal insulation	life
Excellent sealing performance and high connection reliability	The weight of the composite pipe is light. Taking dn400 as an example, the weight of the composite pipe is 25kg/m, which is only 1/2 of the steel pipe.	The construction period is short, the human, material and financial resources invested are low, and the construction cost is low	The thermal conductivity of steel pipes is large (48w/m2.k), and corresponding insulation treatment must be done when transporting these media. Generally, a thick layer of polyurethane insulation material is laid on the outer surface of the steel pipe	50 years
Human factors are large and the operation is more complicated	The weight of the single pipe is heavy, taking 420*6 as an example, the weight is about 63kg/m	The construction period is long, the human, material and financial resources invested in the construction are large, and the construction cost is high	Good pressure resistance	10-25 years
The construction conditions are relatively high, and the installation quality is greatly affected by human factors	Monomer weight: dn400: 81.00kg/m	The construction is complicated, the construction period is long, and the total construction cost is high	Poor impact resistance	10-25 years

Steel mesh skeleton plastic (polyethylene) composite pipe