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Cross Helically Wound Steel Wires Reinforced UItra-High Molecular Weigh Polyethylene Composite Wear-Resistant Pipe

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Cross Helically Wound Steel Wires Reinforced UItra-High Molecular Weigh Polyethylene Composite Wear-Resistant Pipe

Cross helically wound steel wires reinforced ultra-high molecular weight polyethylene composite wear-resistant pipe (SRUP) is a composite pipe formed by taking the ultra-high molecular weight polyethylene by (PE-UHMW) inner pipe as the matrix, using the high-strength steel wire wrapped with adhesive resin as the reinforcement, and the high-strength polyethylene as the protective layer. The matrix, reinforcement, and protective layer are tightly connected with adhesive resin, and are formed by melting composite.

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SHUANGTENG

Product Description

Characteristic

◉ The PE-UHMW inner pipe strictly follows the extrusion type with a viscosity average molecular weight M greater than 3 million

◉ The PE-UHMW base resin is the main component, with various additives not exceeding 5% in the formula and non melting processing technology. The extrusion speed is not greater than 1.1m/h, which maximizes the wear resistance and ensures that the performance of the PE-UHMW inner pipe meets the requirements of QB/T2668.1-2017 "Ultra High Molecular Weight Polyethylene Pipe".

◉ The PE-UHMW inner pipe in contact with the conveying medium gives SRUP excellent performance in terms of wear resistance, corrosion resistance, self-lubricating, non scaling, extremely low friction coefficient, and low conveying energy consumption.

◉ Steel plastic composite, high-strength steel wire bears about 70% of the internal pressure load. SRUP has high pressure bearing capacity, large flow area, extremely low friction coefficient, and excellent hydraulic characteristics, making it energy-saving and environmentally friendly.

◉ Adhesive thermoplastic composite pipe, with peel strength meeting the requirements of CJ/T 189-2007, outer layer made of polyethylene pipe special material, mainly using electric melting connection, convenient, fast, safe and reliable.

Product Specification

Outer Diameter dₙ / mm	Average Outer Diameter dₑₘ / mm		PE Protective Layer Minimum Wall Thickness eᵧ,ₘᵢₙ / mm	Nominal Pressure PN / MPa
	dₑₘ,ₘᵢₙ / mm	dₑₘ,ₘₐₓ / mm		1.0		1.6		2.0		2.5		3.5
				Minimum Wall Thickness e Range / mm
				≥	≤	≥	≤	≥	≤	≥	≤	≥	≤
160	160.0	162.0	2.5	—	—	—	—	12.0	14.2	12.0	14.2	12.0	14.2
200	200.0	202.3	2.5	—	—	—	—	12.0	14.2	12.5	14.7	13.0	15.2
225	225.0	227.5	2.5	—	—	—	—	12.0	14.2	12.5	14.7	—	—
250	250.0	252.5	2.5	—	—	12.0	14.2	12.0	14.2	13.0	15.2	—	—
315	315.0	317.7	3.5	13.0	15.5	13.0	15.5	13.0	15.5	14.5	17.0	—	—
355	355.0	357.8	3.5	13.0	15.5	14.0	16.5	—	—	—	—	—	—
400	400.0	403.0	3.5	13.0	15.5	15.0	17.8	—	—	—	—	—	—
431	431.0	434.0	3.5	13.5	16.0	15.5	18.3	—	—	—	—	—	—
450	450.0	453.2	3.5	14.0	16.5	16.0	18.8	—	—	—	—	—	—
483	483.0	486.2	3.5	15.0	17.5	16.5	19.3	—	—	—	—	—	—
500	500.0	503.2	3.5	16.0	18.8	18.0	20.8	—	—	—	—	—	—
560	560.0	563.2	3.5	20.0	23.0	21.0	24.0	—	—	—	—	—	—
630	630.0	633.2	3.5	22.0	25.0	24.0	27.0	—	—	—	—	—	—

The thinnest wall thickness of the PE-UHMW inner layer shall not be less than 1/3 of the minimum wall thickness e of the pipe.

The thinnest part of the PE-UHMW inner layer has a wall thickness of not less than 6.0mm.

Note 1: Pipes with specifications and/or pressure ratings not specified in the table can be customized.

Note 2: The wall thickness of the pipe and/or the inner wall thickness of PE-UHMW can be customized.

Note 3: When conveying strongly worn media, it is advisable to use end injection molded ultra-high molecular weight polyethylene steel skeleton composite pipes.

Performance

1. Hydrostatic strength and burst pressure

Test Type	Test Temperature / ℃	Test Pressure / MPa	Test Duration / h	Performance Requirement	Test Method
Hydrostatic Strength	20	2PN	1	No rupture, no leakage	GB/T 6111
Hydrostatic Strength	60	1.5×0.7PN	165	No rupture, no leakage	GB/T 6111
Burst Pressure	20	Continuous pressure increase until specimen bursts	—	≥ 3PN	GB/T 15560

Note: When the nominal diameter is ≥ 250, the burst pressure test is not mandatory.

2. Physical and mechanical properties

Serial Number	Item	Requirement	Test Conditions	Test Method
1	Melt Mass Flow Rate (MFR)	The change of PE MFR before and after processing shall not exceed ±25%	5kg, 190℃	GB/T 3682
2	Thermal Stability (Oxidation Induction Time)	≥ 20 min	210℃	GB/T 19466.6
3	Stress Crack Stability	No cracks, delamination or cracking phenomenon	100 mm/min	GB/T 32439
4	Peel Strength	≥ 10 N/mm	100 mm/min	GB/T 2791
5	Cut Ring Hydrostatic Strength	No rupture or leakage at the cut annular groove	20℃, 1.5PN, 165 h	GB/T 32439
6	Abrasion Index	≤ 140	—	QB/T 2668.1-2017
7	Inner Pipe Slurry Abrasion Rate	≤ 0.30%	—	QB/T 2668-2004

3. Pressure derating coefficient for various temperature

Temperature t / ℃	t ≤ 20	20 < t ≤ 30	30 < t ≤ 40	40 < t ≤ 50	50 < t ≤ 60
Pressure Reduction Coefficient f₁ at Working Temperature	1.0	0.95	0.90	0.86	0.81

4. Bending radius

Nominal Diameter / dₙ	160	200–315	355–630
Minimum Allowable Bending Radius	80d	100d	110d

5. Support spacing

Nominal Diameter / dₙ	≤ 200		> 200
Nominal Diameter / dₙ	Riser	Horizontal Pipe	Riser	Horizontal Pipe
Support Spacing / m	2.4	1.6	3.0	2.5

6. Other engineering design parameters

Item	Value
Medium Temperature	-20 ≤ t ≤ 60℃
Elastic Modulus	2.8 ~ 3.0 GPa
Thermal Conductivity	0.15 ~ 0.2 W/m·K
Wall Roughness	Ra = 0.007
Equivalent Absolute Roughness of Pipe Wall	0.0015–0.009 mm, unchanged with operating time
Hazzen-Williams Coefficient	155, unchanged with operating time
Linear Expansion Coefficient	12 ~ 15 × 10⁻⁵ m/m·K

Standards And Technical Specification

◉《cross helically wound steel wires reinforced ultra-high molecular weight polyethylene composite wear-resistant pipe》Q/STG 07-2022

◉《Technical specification for buried plastic pipeline of water supply engineering》CJJ 101-2016

◉《Code for construction and acceptance of water and sewerage pipeline works》GB/T 50268-2008

◉《Technical specification for stell wire mesh and plastic(PE)composite pipe of water supply pipeline》CECS 181-2005

Comparison Of Wear Resistance

The friction coefficient of ultra-high molecular weight polyethylene is the smallest, and its wear resistance is superior to that of ultra-high molecular chains, which are particularly long materials such as polytetrafluoroethylene, nylon, and carbon steel contribute to the extremely high wear resistance of SRUP.

1. The influence of molecular weight on wear resistance

The wear values of PE-UHMW pipes measured by Shanghai Chemical Research Institute are listed in the following table:

Molecular Weight (×10⁶)	250	330	500
Wear Loss (g)	0.0172	0.0146	0.0139

2. Comparison with other materials

The "Research Report on Plastic Pipe Wear Test" by Beijing Nonferrous Metallurgy Design and Research Institute points out that the following four types are not. The results of testing pipelines of the same material under the same diameter, flow rate, test material, and concentration conditions. For: the average annual wear thickness of glass fiber reinforced polypropylene pipes is 11.5424mm/year; Engineering grade polypropylene pipe. (PP) 13.5828mm/year; Ultra high molecular weight polyethylene pipe (UHMW-PE) 5.0104mm/year; steel pipe. (A3) 36.2424mm/year; The experimental results indicate that ultra-high molecular weight polyethylene (UHMW-PE) pipes are wear-resistant. Sex is seven times more than steel pipe (A3).

Material	UHMW-PE	MC Nylon	Nylon 66	PTFE	POM	Phenolic Resin	HDPE	PVC	Stainless Steel	Carbon Steel	Brass
Wear Rate	1	4	5	6	6	16	10	10	7	7	27

3. Comparison with composite pipes made of polyethylene pipes or polyethylene substrates

Appendix A of QBT5101-2017 "Test Method for Wear Resistance of Plastic Pipes" uses dn160 ultra-high molecular weight polyethylene pipes and dn160 polyethylene pipes to conduct wear resistance tests respectively

After 1 million swings, the mass wear of ultra-high molecular weight polyethylene pipes was 39.4 grams and the wall thickness wear was 0.63mm. The mass wear of polyethylene pipes was

79.2 grams, with a wall thickness wear of 1.36mm.

Under the same working conditions, the mass wear and wall thickness wear of ultra-high molecular weight polyethylene pipes are less than 50% of those of polyethylene pipes.

Engineering Application

◉ Thermal power generation: transportation of fly ash, return water pipeline.

◉ Oil extraction: long-distance transportation of crude oil.

◉ Coal industry: coal powder transportation, coal water slurry transportation.

◉ Mining industry: transportation of tailings and mud, underground filling of pipelines.

◉ River dredging: transportation of dredged sediment and sand.

◉ Chemical industry: transportation of corrosive media.

◉ Sea and lake salt chemical industry: sea salt transportation, brine transportation.