Standard :GB/T19472.2-2019 BS EN 13476.3 2018
Ring stiffness：SN4,SN6,SN8,SN10,SN12.5
Size:DN200~3000mm
Length：6meter or customization.
Color：black inside and out side,other color customization accepted.
Introduction
Krat tube, also known as polyethylene winding structure wall B-type tube, is a type of flexible pipe with a smooth inner wall and spiral reinforced ribs on the outer wall. It is made of a ribbed tube with an O-shaped interface between the bottom film and ribs through a spiral winding process.
Using high-density polyethylene as the raw material, it is formed in one go through the winding process in the hot melt state, and cooled by rolling air cooling before demolding in the hot state. The pipeline gradually dissipates heat, with uniform wall thickness and no internal stress.
Features
l Good flexibility: able to adapt to construction under poor foundation conditions and resist uneven settlement;
l Environmental flexibility: Pipelines belong to flexible pipes, which can undergo significant deformation before being compressed and damaged. External pressure loads will be transmitted and distributed to the surrounding backfill soil.
l Convenient connection: Adopting socket type electric fusion connection and socket type sealing ring connection, simple and fast;
l Good sealing performance: adopting socket type electric fusion connection can achieve zero leakage;
l Corrosion resistance: Pipeline materials are corrosion-resistant, so they will not be corroded by acid, alkali, and oil in sewage and wastewater;
l Cold and heat resistance: The pipes will not freeze or expand or leak water in an environment of minus 60 ℃; The pipeline can maintain good performance within 45 ℃;
l Lightweight: The pipes have low requirements for the bearing capacity of the foundation and are beneficial for reducing the utilization rate of machinery:
l Low construction cost: lightweight, easy to connect, can save required working time and engineering costs;
l Wear resistance: PE is a wear-resistant material with a resistance four times that of steel pipes and a long service life;
l Non toxicity: PE is a hygienic and non-toxic material, with no toxic gas emissions during combustion and no hidden danger of "white pollution";
l Good hydraulic performance: smooth interior, low friction resistance, and fast drainage speed.
Application
l Municipal water supply and drainage: municipal drainage and sewage pipes;
l Petroleum industry: oil and gas pipelines;
l Coal industry: medium transportation engineering, various ventilation systems;
l Chemical engineering: corrosive fluid pipeline;
l Environmental protection projects: deep-sea sewage discharge, sewage treatment, garbage dump sewage discharge and detoxification pipeline;
l Power engineering: circulating water pipeline.
Mechanical properties Standard：EN13476.3
NO. | Item | Requirements | Testing method |
1 | Ring stiffness KN/m2 | SN4 | ≥4 | EN ISO 9969 |
SN8 | ≥8 |
SN12.5 | ≥12.5 |
2 | Ring flexibility 30 % of Dem | No cracking | EN ISO 13968 |
3 | longitudinal reversion | ≤3% no delamination cracks or bubbles | EN ISO 2505 |
4 | Impact strength at0°Ca(Round the clock method)dim max ≤ 1 200 | TIR≤10% | EN ISO 3127 |
5 | Impact strength at 0°C f d im max > 1 200 | Meet BS EN 13476.3 2018 Annex K | BS EN 13476.3 2018 Annex K |
6 | Creep ratio | ≤4 | EN ISO 9967 |
7 | Sealing experiment of connecting parts | No leakage | ISO 13259 |
8 | Tensile strength of seam Nominal size DN/ID or DN/OD DN < 400 400 ≤ DN < 600 600 ≤ DN < 800 DN ≥ 800 | Minimum tensile Strength N 380 510 760 1 020 | EN ISO 13262 |
DN/ID mm | Dim min mm | Minimum wall Thickness mm |
| DN/ID mm | Dim min mm | Minimum wall Thickness mm |
e 4,min e 5,min | e 4,min e 5,min |
200 | 195 | 1,5 | 1,1 |
| 1700 | 1685 | 6 | 5 |
300 | 294 | 2,0 | 1,7 |
| 1800 | 1785 | 6 | 5 |
400 | 392 | 2,5 | 2.3 |
| 1900 | 1885 | 6 | 5 |
500 | 490 | 3,0 | 3,0 |
| 2000 | 1985 | 6 | 6 |
600 | 588 | 3,5 | 3,5 |
| 2100 | 2085 | 6 | 6 |
700 | 673 | 4.1 | 4 |
| 2200 | 2185 | 7,0 | 7,0 |
800 | 785 | 4,5 | 4,5 |
| 2300 | 2285 | 7,0 | 7,0 |
900 | 885 | 5 | 5 |
| 2400 | 2376 | 7,0 | 7,0 |
1000 | 985 | 5 | 5 |
| 2500 | 2475 | 7,0 | 7,0 |
1100 | 1085 | 5 | 5 |
| 2600 | 2574 | 7,0 | 7,0 |
1200 | 1185 | 5 | 5 |
| 2700 | 2685 | 7,0 | 7,0 |
1300 | 1285 | 6 | 5 |
| 2 800 | 2772 | 7,0 | 7,0 |
1400 | 1385 | 6 | 5 |
| 2900 | 2885 | 7,0 | 7,0 |
1500 | 1485 | 6 | 5 |
| 3000 | 2970 | 10 | 10 |
1600 | 1585 | 6 | 5 |
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