INTRODUCTION:
Polyethylene is a thermoplastic Polyolefin material generated from the polymerization of ethylene. It is manufactured on a petrochemical basis with petroleum as the raw material. Depending of the polymerization process, different types of polyethylene materials are obtained. LDPE, with a density of 0.91 ̴ 0.93 g/cm is manufactured at very high pressure. While HDPE, with density of 0.94 ̴ 0.96 g/cm is manufactured at low pressure. Several modified copolymers have been developed in recent years. A recently developed grade, often termed as PE 100 with a density of 0.95 ̴ 0.965 g/cm, has significantly higher strength properties than normal HDPE. It is especially designed for the production of larger diameter & thick walled pipe, but can be processed for the whole range of diameters. It also shows excellent resistance to rapid crack propagation and slow crack growth.
 
Table 1 : Physical Properties of HDPE:
Property Test Method Units PE 80 PE 100

Density (Compound)

ISO 1183

Kg/m

956

959

Melt Flow Rate(190C/5kg)

ISO 1133

g/10 min

0.3

0.25

Tensile Stress at Yield(50mm/min)

ISO 527-2

MPa

22

25

Elongation at Break

ISO 527-2

%

> 600

> 600

Charpy Impact Strength, notched

ISO 179/1eA

kJ/m

14

16

Carbon Black Content

ASTM D 1603

%

2

2

Vicat Softening Point

ASTM D 1525

C

118

122

Brittleness Temperature

ASTM D 746

C

< -70

< -70

ESCR (10% Igepal), F50

ASTM D 1693A Hrs. >10,000 >10,000

Thermal Conductivity

DIN 52612 W/mK 0.4 0.4

Linear Thermal Expansion

ASTM D 696 1.5x10ˉ4 1.5x10ˉ4

APPLICATION:

Pipes made of HDPE are flexible, strong, light in weight, highly resistant to UV radiation, impact resistant, and has more abrasion resistance than metal pipes. HDPE Pipe is non-toxic and extremely resistant to chemicals, solvents and radioactive waste water. It has become widely adopted in a variety of piping systems and rapidly replacing most conventional pipes. HDPE Pipes proved very successful in the potable water supply for domestic service lines, main schemes, sprinkler and drip irrigation systems, fire fighting networks, laboratories, industrial process lines, sewage and drainage, electrical conduit and many other applications.

QUALITY POLICY: 
It is the policy of Al Jubail Sanitary Pipe Factory (JSPF) to provide its customers High Quality HDPE/LDPE Pipes & Fittings as per DIN & ISO Standard, On-time delivery, and ever improving levels of customer satisfaction. JSPF is dedicated to continual improvement of its products, services and the company itself, through process control, employee empowerment and management commitment, in compliance with the requirements of ISO 9001:2000.COLOUR OF PIPES: JSPF Pipes are normally supplied in black colour to counter attack Ultra-Violet Radiation and to suit extreme weathering conditions. Other colour like Orange PE Pipe is suitable for electrical conduit. A co-extrusion system was introduced lately to produce black pipe with colour stripes depending on pipe application. Blue stripe for potable water, Orange for electrical conduit and yellow for gas application.

DIMENSIONS: 
All dimensions are expressed in metric units. The diameters of the pipes & fittings are measured in millimeters(MM) and represent the outside diameter of the pipe. To facilitate comparison of Metric to Inch range, a table of corresponding diameters is shown in
Table 2

MM 

16

20

25

32

50

63

75

90

110

125

160

200

250

315

355

400

450

500

630

Inch 3/8 1/2 3/4 1 1 2 2 3 4 5 6 8 10 12 14 16 18 20 24

CHEMICAL RESISTANCE:

High density polyethylene pipe offers a remarkable resistance to most of the Chemical Agents. It is unaffected by all kinds of water(drinking or waste), corrosive liquids, most common acids and alkalies, and all forms of corrosion normally encountered in metallic pipes. It is tasteless, odourless, non-toxic, and also can not be attacked by bacteria throughout its lifetime. Therefore it is a good choice for conveying drinking water and aqueous of foodstuffs. 

THERMAL PROPERTIES 
The water or any medium contained in polyethylene pipe changes temperature more slowly than in any other conventional pipe, because the thermal conductivity of this pipe is very low (0.43w/mK). Also the chances of bursting the pipe are reduced by the ability of the pipe wall to take up expansion. 

EFFECT OF ELEVATED TEMPERATURE:
 
The nominal working pressure has been calculated for operational conditions at 20C. Since Polyethylene is a thermoplastic material, a loss in mechanical properties is to be expected as the temperature rises. Where the system is to be operated at temperatures above 20C, then it must be reduced in respect of the maximum operating pressure & service life, details of which are shown in.

Table 3 : Working Pressure of HDPE Pipes at elevated temperatures as per DIN 8074-1999E.

Temp. 
C

Years of Service

Working pressure 
in Bar

Working pressure 
in Bar

Working pressure 
in Bar

Working pressure 
in Bar

 

 

PE 80

PE 100 

PE 80 

PE 100 

PE 80 

PE 100 

PE 80 

PE 100 

20

50

4

4

6

6.3

10

10

16

16

30

50

3.3

3.3

5

5.3

8.4

8.4

13.5

13.5

40

50

2.9

2.9

4.3

4.5

7.2

7.2

11.6

11.6

50

15

2.2

2.3

3.4

3.7

5.7

5.9

9.1

9.5

60

5

1.8

1.9

2.7

3.0

4.5

4.8

7.2

7.7

70

2

1.3

1.5

2

2.4

3.4

3.9

5.5

6.2

 

For further information, contact the technical support department