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HDPE Weholite Structured Wall Pipe
TIME:2018/7/5 14:15:36  ▏Author:Shanghai Qingyuan Pipe Technology Co., Ltd.  ▏Click:

HDPE Weholite Structured Wall Pipe

Weholite pipe (also known as spirally enwound structured wall pipe) is made from High Density Polyethylene resin which can be used for municipal drainage and sewage, agriculture water supply, other water supply with low pressure, industrial drainage and sewage. Weholite pipe ends can be flat or with socket.

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Weholite pipe specifications

Nominal Diameter

Min Inner Thickness

Pipe Average Outer Diameter   With Different Stiffness (mm)

(mm)

(mm)

SN4

SN6.3

SN8

SN10

SN12.5

SN16

SN18

DN200

1.1

213

215

216

217.5

219

221

225

DN250

1.5

269

271

271.8

275

277

279

282

DN300

1.7

325

326.4

329.4

331

333.2

334.5

338

DN400

2.3

436

437.2

439.2

441.2

445.4

449

452

DN450

2.8

491.2

493.2

494.6

499

503

506.6

509

DN500

3.0

544

545.6

547.4

549

551

553

555

DN600

3.5

656

658

662.6

665

671

673.4

676

DN700

4.1

764

766

768

771

775

780

783

DN800

4.5

862

876

884

889

892

897

903

DN900

5.0

979

987

990

993

998

994

997

DN1000

5.0

1,097

1,112

1117

1123

1132

1134

1137

DN1100

5.0

1,202

1210.6

1218

1225

1230

1237

1241

DN1200

5.0

1,324

1,330

1332

1337

1340.4

1345

1349

DN1300

6.0

1,432

1,436

1440

1446

1448

1452

1456

DN1400

6.0

1,540

1,542

1548

1550

1553

1559

1563

DN1500

6.0

1,658

1,652

1655

1659

1665

1677

1683

DN1600

6.0

1,767

1,772

1776

1778

1780

1786

1792

DN1700

6.0

1,869

1,873

1876

1880

1885

1891

1894

DN1800

6.0

1,978

1,982

1984

1988

1993

1996

1999

DN1900

6.0

2,082

2,088

2092

2097

2104

2109

2112

DN2000

6.0

2,230

2,236

2239

2241

2245

2248

2252

DN2200

7.0

2,456

2,460

2464

2466

2469

2473

2479

DN2400

9.0

2,660

2,664

2666

2670

2676

2679

2684

DN2500

10.0

2,764

2,768

2770

2774

2778

2783

2788

DN2600

2,920

2,926

2930

2936

2941

2947

2951

DN2800

3,150

3,155

3159

3164

3167

3172

3177

DN3000

3,370

3,375

3379

3384

3387

3392

3397

 

Technical Standard

ISO 21138-2007

The production and construction of products strictly implement international national standards.

GB/T 19472-2017

No pressure buried drainage structure wall pipe system.

DIN 16961-1989

Embedded polyethylene (PE) wall pipe system.

BS EN 13476-2007

The thermoplastics pipe in the outer wall and the inner surface of the smooth tube.

BS EN 13476-2007

Non - pressure underground drainage and drainage plastic piping system.

 

Characteristics

1. Double wall with spring-reinforced structure.

The product design adopts the theory of double wall with spring-reinforced structure. It can be bended, compressed and stretched without being easily flat which has significantly improved loading capacity to withstand outer pressure. Special spiral pipe structure in which inner wall and outer wall are adopted collectively to constrain spring-shaped reinforced stripes has fully utilized the high ring rigidity of spring to achieve the optimized structure design. Compared with the reinforce pipe, Weholite pipe has an additional outer wall stronger structure and ring stiffness.

2. Excellent raw materials are chosen to produce excellent products.

For pipe raw materials, the elastic modulus is one important element. Based on the calculation formula of ring stiffness of plastic pipe in international standard S = E I / D3 (S refer to ring stiffness; E refers to elastic modulus; I refers to moment of inertia; D refers to pipe diameter), we know that pipe ring stiffness is proportional to pipe elastic modulus. Weholite pipe uses high density Polyethylene resin without adding other type of recycled raw materials to make the stiffness perfectly matched while keeping the advantage of flexible pipes.

3. Flexible pipes.

As one kind of pure flexible pipe, Weholite pipe has the different loading mechanism under outer pressure and the different deformation degree from the rigid pipe. It works together with around earth to withstand the load to achieve the same effect with rigid pipe. At present, the ring stiffness of pipe used in municipal project is not less than 8 KN/.

4. High impact resistance capacity with working temperature 4060.

5. Compared with cement pipe at the same size, Weholite pipe is light-weighted and easy to load and transport and install without the help of large lifting and transportation equipments.

6. Low water resistance data. Weholite pipe n0.00780.009 while concrete pipe n0.0130.014.

7. Better wear resistance compare to concrete pipe, UPVC pipe and FRP and pipe.

8. Chemical material resistance. HDPE does not get eroded by acid, alkaline, salt and organic materials and therefore the bacterial and alga will not appear inside the pipe and no rust and scaling materials.   

9. Long time usage. The life span of pipe material is over 112 years and Weholite pipe can be used for 50 years under normal conditions.

10. Convenient connection.

11. Environment friendly. HDPE material can be recycled and will not contaminate the environment.

12. Low installation cost.

 

Technical data

No

Test Item

Technical Requirement

Standard

1

Color and appearance

Pipe is generally in black   color.                          The   inner and outer surface of the pipe should be smooth and without bubbles and   visible particles, no crack for the welding.

GB/T 19472.2

2

Ring flexibility

Without divided layer and   rupture.              After 30 minutes   of test, the minimum inner radius where the pipe is carried with pressure   should be more than 80% of the original radius.                                               Any part of pipe should not result in Permanent yield deformation   including concavity and bulb.

ISO 13968:1997

3

Ring stiffnessKN/m2

SN2     2

GB/T 9647-2003

SN4     4

SN6.3    6.3

SN8     8

SN12.5   12.5

SN16    16

SN18    18

4

Longitudinal dimensional   shrink rate

PE3%

GB/T 6671-2001

5

Drop hammer impact

TIR10%

GB/T 14152-2001

6

Tensile strength

Diameter               Min. Stretch Force(N)

GB/T 8804.3-2003

DN/ID300                    380

400DN/ID500             510

600DN/ID800             760

800DN/ID                  1020

7

Connection sealing

No leakage and damage with   water pressure 0.15 Mpa for 15 minutes under normal temperature

GB/T 6111-2003

8

Melt mass-flow rate (MFR)

1.6g/10min

GB/T 3682-2000

9

Oxidation induction time   (OIT)

20min

GB/T 17391-1998

10

Creep ratio

4%

GB/T 18042-2000

 

Manufacturing process

Blending raw materialsExtrusion machine No. 1Extrusion machine No. 2 Plastic extrusion→Mold filling→Cooling→Mold opening→Taking out of products→Mold closing→Weholite pipe       

 

Construction process

1. Before joining with pipes, please first check whether the elastic expansion rubber rings (Hereinafter referred to as rubber rings) are in good quality and make sure they have not been soaked in the liquid.

2. After stretching rubber rings, put them at the stop ring area of the pipe socket ends evenly, make the upper tooth crest part of rubber rings towards socket side of pipe while the other trough part closely combines with the stop ring of the pipe. Rubber rings are not permitted to be distorted and unevenly piled up.

3. While connecting, please first clean the inside wall of socket pipe and then lubricant (Silicone oil is recommended) is applied at the inside wall of socket pipe and rubber rings. Use cotton yarn or sling to fix socket pipe part and move it above the ground and align the socket pipe part with pipe axis. Sort out the connection part of socket inner wall and rubber ring to avoid hard combination and then slightly push them to the place of safety line.

4. Put sleeper at the bottom of the pipe considering sleeper not damage pipe structure.

5. To prevent the movement of axis of pipes which have already been laid out while joints are being connected together, additional measure for fixing the pipes is needed. One good way is to fill plastic bags with sands and seal the bags and then put them on the top of already laid out pipes. The number of bags depends on pipe diameter. After joining the pipes, elevation and axis of pipe should be rechecked to meet the relevant requirements.

6. During raining seasons, some measure should be taken to prevent pipe afloat in construction. After the installation of pipes, at first earth is filled above the pipe top at some height which is over two times of pipe diameter. Once the flood appears, re-measurement and appearance check of pipe axis and pipe bottom elevation should be made. If the phenomenon of displacement, floating and pulling out is found, they need to be reworked. 

7. Socket connection has the function of stretching as rubber rings can prevent water with extended physical change after installation.

8. Pipes should be laid out on the original land foundation or earth-dense foundation. Minimum thickness of earth cover should follow the requirements listed in the table.

Pipe layout location

Minumum   thickness of earth cover on pipe top(mm)

Under green belt   area

300

Under branch   road in community

500

Under main road   in community

DN≤200 600   / DN200 700

Under roadway

700

  • Shanghai Qingyuan Pipe Technology Co., Ltd.

  • No. 35, Cao Li Road, Fengjing Industrial Park, Jinshan District, Shanghai

  • +86-021-67360101

  • +86-21-67360101

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