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Main Products » HDPE pipes

 

POLYETHYLENE  (HDPE PIPES) 

 

 

For nearly 50 years, polyethylene (PE) has been used to transport fluids. Its ability to withstand harsh chemicals without corrosion and leak as well as the tight installation, polyethylene (PE) has been regarded as the ideal material for the gas industry. The continuing technological improvement of polyethylene materials has resulted in the rapid growth of numerous usages of polyethylene (PE) in both water and gas industries since the early ‘70’s. Polyethylene (PE)  is now the material of choice. It is superb in resisting corrosion. Additionally, butt welding PE joints offer leak-free connection which outperforms any other competing materials in terms of reliability and longevity, not to mention the remarkable savings on the installation costs and life of the materials. 

These improvements in PE materials resulted for the water industry to adopt it for its pressure transmission network. The improvements are mainly the development of pe80 and pe100. In this catalogue, pe100 will be the basis of the discussion, although some references will be made

 

Why opt for high performance polyethylene

 

 (PE100)?

Top

Polyethylene (PE100) is considered as the most heavy duty amongst other types of pe pipes. Compared to PE80 & PE63, PE100 is best used for water & gas mains with its maximum working pressure. It has enhanced toughness, higher permissible design strength and improved resistance to rapid crack propagation. “high strength” hdpe (pe100) pipes offer the water engineer substantial benefits in performance efficiency and economy of its use.

  

Pe100 pipes are also used in various applications such as:

 

·        Sewage pumping mains

·        Fire mains

·        Chilled water

·        Submarine pipe lines

·        Industrial and chemical applications

 

  

Top

 

Why we choose

 

 polyethylene (PE) for pipes ?

 

 

Polyethylene pipe systems offer significant advantages over ductile iron, steel and cement systems. Some of its advantages are as follows: 

 

1.      Corrosion resistance: polyethylene is basically chemically inert. This pipe system does not rust and corrode. This system resists chemical attack from aggressive soils. There is no need for protective layer or finishing process that is required. 

 

2.      Leak tight: butt fused joints create a homogenous system. The fusion weld for this system is very strong. Therefore, unlike ring type joints or the other mechanical jointing systems, there is no risk of leakage resulting from joint distortion. 

 

3.      Optimum flow rate: smooth inside pipe surface allows for a high hazen-williams “c” factor. “c” remains constant throughout the lifetime of the system due to an innate high resistance to scale and biological build up. Polyethylene (PE) is biologically inert. 

  

4.      Excellent water hammer characteristics to withstand surges: the inherent properties of polyethylene allow the system to significantly lower the effect of surges compared to pvc and ductile iron systems. 

 

5.      Flexibility: this system allows polyethylene pipes to be coiled and supplied in length of up to 200m for small diameter pipes. This feature is one of the many contributions to cost savings during the installation process. 

 

6.      Resistance to geological conditions: a polyethylene system has inherent resistance to ground temperature fluctuations and earth instability. 

 

7.      High strain allowed virtually eliminated failure due to freezing pipes

 

8.      Reduced installation costs

 

9.    Long track record of excellent performance, fast approaching to 50 years worldwide.

Top

                

Advantage of polyethylene (100) 

 

 

 

v     High impact and breakage resistance.

v     Very high resistance to direct sunlight (uv resistance for long time .this is supplied by ultraviolet light resistance agent mixed to the pe raw material.

v     There is no need to take protection precautions at the time of installation like cathodic protection.

v     Availability of connection at a place out of the trench.

v     Advantage of being not affected from earth movements like landslide , earthquakes , etc. 

v     P.e pipes require less fittings for connection because they are elastic and in many place they do not require connection where the other types do. Because pe pipes  are bendable with a radius of 20 times of its out diameter. The other pipe type do not have this advantage.

v     Advantage of mobilization of the pe pipe production facilities .this enable very big saving in transport costs for projects where large diameter pipes are required.

v     Advantage of higher durability & advantage of easy installation and transport without material loss.

v     Pe pipes do not require concrete block at the place like bending and tee separations.

v     Pe pipes do not require welding characteristics. 

v     Very good adoption to earth movements.

v     Many different pressure resistance option , pe pipe can be produced resistant to 12 different pressure class from 2.5 bar up to 32 bar. 

v     High resistance to chemical , not affected from corrosion , decaying and abrasion. 

v     Advantage of perfect leak proof no crack no break and no deformation. 

v     Advantage of safe application in irregular surface like sea, river lake passages at place where there sockets etc.

v     Availability of more than one connection method (butt welding. Electro fusion welding , push fit sockets etc.)

v     Advantage of having perfectly smooth internal surface because of this advantage of pe pipes in comparison to the other pipe types .this brings considerable saving in the overall cost of the line and the services costs.

v     Pe pipes have the advantage of very long service life under severe conditions.

v     Pe pipes are light in weight which enable the installation with high speed at places.

v     Pe pipes are elastic which is a big advantage during the earthquake or any other earth movements. This characteristics also big advantage in transport (coiling up to 125 mm diameter and in installation costs. 

Product name

Sps hdpe pe 100 for water  application

Raw material

Hdpe pe 100

Product color

Black with blue strip

Product standard

En 12201

Other standard

 

Product standard for fittings

En 12201- 03

 Product specification:

Rpoduct range

16mm - 630mm

Pressure rating

Pn 6 to pn 16

Production unit length

 

16mm - 160mm (coils)

16mm - 630 mm (12 meter bars)

 Technical specification:

 

Polymer data

Pe 100

Unit

Test method

Density at 23 °c

0.966

Gr/cm ³

Iso 1183

Viscosity number

360

Cm³/gr

Is0 1628 -3

Mfr 190 / 5 kg

0.22

Gr/ 10 min

Is0 1133

Mechnical  properties

 

 

 

Yield stress

23

Mpa

Is0 527

Elongation at yield

9

%

Is0 527

Tensile modulus

900

Mpa

Is0 527

Notched impact strenght

26

Kj/m²

Iso 179 /1ea

23° c

 

 

 

20° c

13

Kj/m²

Iso 179 /1ea

Other propeties

 

 

 

Oxidation - induction time at 210 °c

20

Min

En 728

Carbon black content

2.3± 0.2

%

Iso 6964

Carbon black dispersion

≥3

-----

Iso 18553

Mrs minimum required strength

>10

Mpa

Iso tr9080

Resistance to s.c.p (slow crack

>3000

H

En 33479

Propagation ) 4.6 mpa 80 c notched

 

 

 

Resistance to r.c.p  (rapid crack

>25

Bar

Iso dis 13477

Propagation s4 test 110/10mm . 0 °c

 

 

 

Elongation at break

 350

%

En iso 6259 

Linear thermal expansion

 

%

En 638

Specific thermal capacity

 

C -1

Astm d 696 (20-60° c)

Electrical properties

 

 

 

Electric strength

>20

Kv/mm

Bs 2782 201 b

Volume resistively

>10 ^13

Ω m

Bs 2782 201 a

Surface resistively

>10^19

Ω

Bs 2782 201 a

Relative permittivity

2.6

-

Bs 2067 (1 to 20 mhz)

Loss tangent

3 x 10^ -4

 

Bs 2067

Dimensional characteristics HDPE PE-100

            (outside diameter, wall thickness, weight/meter)

 

Sdr

Nominal

Sdr 26

Sdr 17

Sdr 11

Outside

Nominal pressure

Diameter

Pn 6

Pn 10

Pn 16

  od

En

Weight

En

Weight

En

Weight

Mm

 

/ meter

 

/ meter

 

/ meter

16

---

---

---

---

---

---

20

---

---

---

---

---

---

25

---

---

---

---

---

---

32

---

---

2.0

---

2.0

0.29

 

 

 

 

 

 

 

40

---

---

2.4

0.31

4.2

0.45

50

2.0

0.29

3.0

0.47

5.2

0.70

63

2.5

0.48

3.8

0.76

6.5

1.10

75

2.9

0.65

4.5

1.07

7.6

1.54

 

 

 

 

 

 

 

90

3.5

0.93

5.4

1.53

9.2

2.23

110

4.2

1.39

6.6

2.28

11.1

3.30

125

4.8

1.80

7.4

2.90

12.7

4.27

140

5.4

2.26

8.3

3.64

14.1

5.34

 

 

 

 

 

 

 

160

6.2

2.95

9.5

4.75

16.2

7.00

180

5.9

3.72

10.7

6.00

18.2

8.83

200

7.7

4.60

11.9

7.39

20.2

10.90

225

8.6

5.83

13.4

9.38

22.7

13.79

 

 

 

 

 

 

 

250

9.6

7.20

14.8

11.48

25.1

17.03

280

10.7

9.03

16.6

14.43

28.1

21.32

315

12.1

11.42

18.7

18.27

31.6

27.04

355

13.6

14.51

21.1

23.26

35.6

34.27

 

 

 

 

 

 

 

400

15.3

18.42

23.7

29.40

40.1

43.53

450

17.2

23.31

26.7

37.26

45.1

55.17

500

19.1

28.78

29.7

46.05

50.1

68.04

560

21.4

36.10

33.2

57.66

56.0

85.28

630

24.1

45.69

37.4

73.07

63.1

108.02

En                    -            nominal wall thickness

Sdr                   -            standard dimension ratio

Dimension         -           mm

Dimensional characteristics HDPE PE 80

 (outside diameter, wall thickness, weight / meter)

 

Sdr

Nominal

Sdr 26

Sdr 17

Sdr 11

Outside

Nominal pressure

Diameter

Pn 5

Pn 8

Pn 12.5

  od

En

Weight

En

Weight

En

Weight

Mm

 

/ meter

 

/ meter

 

/ meter

16

---

---

---

---

---

---

20

---

---

---

---

2.0

---

25

---

---

---

---

2.3

---

32

---

---

2.0

---

3.0

0.29

 

 

 

 

 

 

 

40

---

---

2.4

---

3.7

0.45

50

2.0

---

3.0

0.47

5.2

0.70

63

2.5

0.52

3.8

0.75

6.5

1.10

75

2.9

0.71

4.5

1.06

7.6

1.53

 

 

 

 

 

 

 

90

3.5

1.03

5.4

1.53

9.2

2.22

110

4.2

1.51

6.6

2.27

11.1

3.28

125

4.8

1.93

7.4

2.89

12.7

4.26

140

5.4

2.44

8.3

3.63

14.1

5.32

 

 

 

 

 

 

 

160

6.2

3.20

9.5

4.74

16.2

6.95

180

5.9

3.96

10.7

5.97

18.2

8.79

200

7.7

4.91

11.9

7.36

20.2

10.85

225

8.6

6.17

13.4

9.34

22.7

13.74

 

 

 

 

 

 

 

250

9.6

7.64

14.8

11.43

25.1

16.96

280

10.7

9.52

16.6

14.37

28.1

21.23

315

12.1

12.15

18.7

18.19

31.6

26.92

355

13.6

15.32

21.1

23.16

35.6

34.12

 

 

 

 

 

 

 

400

15.3

19.43

23.7

29.28

40.1

43.34

450

17.2

24.56

26.7

37.10

45.1

54.94

500

19.1

30.29

29.7

45.86

50.1

67.76

560

21.4

37.93

33.2

57.42

56.0

84.92

630

24.1

48.07

37.4

72.76

63.1

107.56

En                    -            nominal wall thickness

Sdr                   -            standard dimension ratio

Dimension         -           mm                             

Relationship between PN & SDR 

Sdr

Nominal presssure (pn)

In bars for  material class

Pe 80

Pe 100

11

12.5

16

17

8

10

26

5

6

 

Top

perfect leak proof at connection point 

            sample with butt welding                  sample without butt welding

              (result of tensile test)                                     (result of tensile test) 

As seen in the test sample as the result of the tensile test , the energy required for  breaking the welded and un welded  pipe area is the same . Its means that the butt welded area is also as strong as the pipe itself .

( test sample is shown in picture as above). 

Result of the test butt welding  is the most reliable welding method for

Potable water pipes. 

The advantage of butt welding

  1. Its does not require special fitting for connection.
  1. The butt welding  machine are easy to supply in all corners of the world.
  1. With butt welding ,some fitting like bends and t pieces can be produced at the site.
  1. Butt welding can be applied for all diameter and for all pressure rating. (for best results the minimum wall thickness must be 3 mm)
  1. Butt welding operation is very easy to learn and very practical.

Availability of more than one connection  method.

 Pe pipe have the several option for connection. The connection method is selected according to the place and condition where the pipe will operate.

 Butt welding method

This method of welding is the method most frequently used . For operating this welding ,an electric power source and butt welding machine is enough.

 Electro fusion welding

This method is applied for ensuring the highest safety in the welding area. This welding is used especially for gas transmission pe pipes where any gas leakage can cause mortal disaster .a socket specially designed and produced for electro fusion welding  and electro fusion welding machine is necessary for this welding .the cost of this weld is higher than butt welding.

 Push-fitt socket connection

This systems is not a welding but instead a system of pipe and muffle inserted into each other by pushing .this systems is preferable for the ones who like connection with o-ring .the superiority of this systems to the other o-ring systems is the usage of double o-ring which one of them ensuring the leak proof and the other prevents the movement of the pipe from its place in the socket.

Availability of connection at a place out of trench.

Because of their elastic nature ,pe pipes can be connected at a place near the trench and then can be lay down into trench .during the lay down, the pipe connection points do not move or break. This method of making connection out of the trench can be applied to all pe pipes of every diameter.

 Advantage of PE pipes during installation  

  1. Its is enough to open the trench 5 cm wider than the pipe diameter. This means less excavation and less sand filing.
  1. To make connection in the trench is very difficult. To make welding works out of the trench gives good saving in installation time and costs.
  1. its is possible to prepare the pipe line near the pipe line area without even opening the trench .because  if the trench is opened much earlier  than the time of pipe line installation then there may be some collapses in the walls of the trench and also it may be necessary to clean the trench again which is cost also.

 

 making connection out of the trench and laying down the pipe

 

 TOP

 

The abrasion of pe pipes is very low.

The advantage of less need of brining special filling sand out of the site, less excavation and less filling sand need.

For laying down the pe pipes ,it is enough to leave a small place at each side of the pipe which is enough for the operation of the compaction machine .there is no need to bring  sand for bedding. Its is enough to prepare the trench bottom surface with an angle of 120 degree. The earth derived from the excavation can be used as filling sand after eliminating the big size stones and sharp object that may damage the pipe .in rocky place ,the sharp sides of the rocks are covered by sand in order not to allow it to damage the pipe.

Advantages

1.       since there is no need to bring special filling sand from out of the excavated area, filling sand cost is minimum.

2.       since less excavation is done , excavation and filling costs are minimum compared to the other pipe types.

Advantage of pe pipe being used in sea, lake , and river passes

 Pe 100 pipes are elastic, not easily breakable perfectly strong to external loads. Perfectly  strong to internal pressure and have 1000 years of decaying time in nature. These big advantages make them very suitable to be used in sea discharge , pe 100 pipes are the easiest pipe to be sank under either completely or as units of 300 – 500 meters.

 

              (a view from sea discharge application of pe 100 pipes).

 PE pipes have perfect resistance to water impact.

Velocities

Pe 100 , dn 140,dint = 123.4

Pvc 100 , dn 140,dint = 123.4

Steel 5" dint =123.4

M/s

C/g

H max

H work

H min

C/g

H max

H work

H min

C/g

H max

H work

H min

 

13.42

 

 

 

38.77

 

 

 

128.48

 

 

 

1

 

11.34

10

8.65

 

13.88

10

6.12

 

22.84

10

-2.84

2

 

12.68

10

7.31

 

17.75

10

2.24

 

35.84

10

-15.69

3

 

14.03

10

5.74

 

21.63

10

-1.63

 

48.53

10

-28.53

 

 

 

 

 

surface elasticity coefficient (k) of some pipes

 Pipe material                         surface elasticity

                                                coefficient (k)

Iron and steel pipe                                        0.5

Ductile font                                                     1.0

Lead pipe                                                      5.0

Asbestos concrete                                        4.4

Pvc pipe                                                         33.3

Sps pe 100 pipe                                           377

 

Top

Because pf perfect surface elasticity coefficient ,sps pipes have the lowest affection from water impact compared to the other pipe type for this reason for certain pipe lining project ,one size smaller sps pe 100 pipe can be used for the same work of the alternative pipes .as it is seen from the table, for a velocity of 3 m/s , the maximum internal pressure for sps pe 100 pipe is 14.03 bars but at the same condition , the same pressure stand to be 21.63 bars for pvc pipes and 48.53 bars for steel pipes.

Advantage of telescobic transport of pe pipes

 Pe pipes can be transported as the smaller diameter pipes are inserted into bigger diameter pipes (telescobic transport) enabling big transport cost saving.

  

                                         stowage of pe pipes

Advantage of making turns using minimum number of elbows with pe pipe

 Because of their perfect elasticity ,sps pe 100 pipes can make turns with a radius of 20 – 35 times their outer diameter .while the other pipe types can make even 11 and 22 degree turns by using elbows .sps pe100  pipes can turn these angles without any elbow or another fittings. This means big material and time saving in the installation.

 Sps pe 100 pipe can even turn 90 degree without elbow with a turning radius which will be calculated with the following formula. 

R = dd   (sdr -1)

                  1.12

 

    r       : the radius with which the pipe can bend without breaking

   dd    : outer diameter of the pipe

   sdr   : standard dimension ratio (outer diameter / wall thickness)

     

                        (picture  showing bending ability of sps pipes.)

 

Advantage of minimum 50 years services life of pe pipes

The curve in the figure below  shown the  change in the physical properties of pe 100 pipes time.

The production design of pe 100 pipes is done for a services life of 50 years so the minimum services life of pe 100 pipes is minimum 50 years.

Σ circumferecial stress

 

C=1/e(x10^3)

Design criteria

 Classification of pe pipes

Mrs

Class

Nomenclature

Design

(mpa)

No.

Stress

3.2

32

Pe 32

2.5

4

40

Pe 40

3.2

6.3

63

Pe 63

5

8

80

Pe 80

6.3

10

100

Pe 100

8

 TOP

Design stress : 

Σ =      mrs

               c

 

C : safety coefficient (1.25)

(a picture from welding application)

 

 

 

Calculation of wall thickness of pe pipes

  

 The following formula is used to used to calculated the force (n) 

N  = pdm

            2

D         : average diameter

P         : internal pressure

N         : force

Dm  =  d + d              = d – s

               2      

The stress at the pipe surface is calculated from the formula:

                                    Σ   = pdm

                                            2s

Wall thickness           s  = pdm

                                             2σ

Since the outer diameter is consideration for pe pipes in international standard , formula

Dm  =  d + d              = d – s

               2      

                     s= pd

                                     2σ +p

Is obtained for calculating the wall thickness

external hydrostatic pressure

 

  TOP

 In case  of existence of external hydrostatic pressure a load of pbdm

                                    n = pbdm

2

Will be exerted on the pipe .then  the stress on the pipe due to the pressing on the pipe will be :

Σ = pbdm

         2

For the pipe under external pressure , the torque also must  be considered. 

Σb =    e      [  s  ] ²

         1-v²  [dm] 

The pressure that will create the stress in formula above will be : 

Pb =   2e      [  s  ] ³

         1-v²  [dm]

Here ;

          e        : elasticity module

          v        : poisson ratio

          s        : wall thickness

          dm     : average diameter

Water impact 

The change of the velocity of the water passing from the pipe will create a pressure fluctuation inside the pipe.

 

∆p = c  ∆p / g

 

The pressure change due to the change in the velocity of water will be;

∆p     -        pressure change

G       -        gravitational force (9.81 m/s²)

C       -        velocity of the sound in water

∆v      -        change in the velocity of water

 The pressure in case of

Hmax          = his +∆p

 

The pressure in case of depression;

For calculating c value;

C =  ___9900___

               √ 48.3+k d/s  

 D         -           internal diameter

S         -           wall thickness

K         -           surface elasticity co efficient

          Pipe raw material                            surface elasticity

                                                                        coefficients (k)

             iron & steel pipe                                0.5

            font pipe                                             1.0

            lead pipe                                            5.0

            concrete pipe                                    4.4

            pvc pipe                                             33.3

            pe 100 pipe                                       377

 If we use another method for calculating the water impact , the velocity of the sound in water is taken as:            

     ep  g / γ

c=             ep_ + dm

                ew       s

 Here

Ew       -           elasticity module of water

Ep       -           elasticity module of pipe’s raw material

Y          -           density of water

Dm      -           average diameter

S         -           wall thickness

 For pipes ,    ep / 1-v²   must be used for ep value since  ep / ew <<< dm / s

 Ep / ew   is neglected ,hence the formula  above will turn to be ;       

     ep  g / γ  - _s_

c=              1-v²              dm

Velocities

Pe 100 , dn 140,dint = 123.4

Pvc 100 , dn 140,dint = 123.4

Steel 5" dint =123.4

M/s

C/g

H max

H work

H min

C/g

H max

H work

H min

C/g

H max

H work

H min

 

13.42

 

 

 

38.77

 

 

 

128.48

 

 

 

1

 

11.34

10

8.65

 

13.88

10

6.12

 

22.84

10

-2.84

2

 

12.68

10

7.31

 

17.75

10

2.24

 

35.84

10

-15.69

3

 

14.03

10

5.74

 

21.63

10

-1.63

 

48.53

10

-28.53

 Case of passage of from aside

 

 

 The stress (ð) and unit elongation (€) forming due to the passage of pipe from aside and support the pipe as in figure above will be as follow

 Ð  = σ         i²             =         i²     

                                16e     d                 16    d

 And  

Q = 6πe(d^4 – d ^4)    ð

                                        i^4

Here,

 ð        -           collapse

 e         -           elasticity module

 d         -           outer diameter

  D         -           internal diameter

 i          -           interval of support

          -           unit elongation

 q         -           distributed load

 Technical specifications 

Specification of sps  hdpe pe -100:

The list of specification are valid for the pipes and fittings made of pe 100 raw material which are designed for use in potable water and irrigation etc. Purpose.

§         All of the pe 100 pipes fulfill the requirements of en -12201 standard and the design stress is 8 n/mm².

§         All of the test are done according to en standards. 

§         The pipe is in the color of blue or black which is accepted internationally as drinking water pipe colors. If required the pipe can be produced also in black color with blue strips and for increasing the resistance of the pipe to direct sun light ,uv protection.

§         Into the granule form raw material it is not added any additive for production of the pipe and fittings .raw material is used absolutely in its original composition. 

§         The sps hdpe pe 100 pipes have perfect resistance to chemical solutions.

 Repair of damage pe pipe

The pipe can be damage in any case .the repair of the pipe can be done using several method .it is necessary to choose  the best of these repair method which suits to the type of damage part on the pipe.

 Making repair using flange

The damage area of the pipe is unearthed to an extend where the pipe can be moved towards each side.

The equipment necessary to make a flange connection to pe pipe end are the following;

·        Butt welding machine

·        2 piece flange

·        Gasket for flange

·        Screw and bolts for flange

·        Electric power supply.

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 Minimum required strength  (MRS)

Polyethylene pipes and fittings material are evaluated by their minimum required strength (mrs)

When mdpe (pe80) pipes are hydrostatically tested at 20 °c, a minimum required strength at 50 years of  8mpa (80 dan/cm² )- mrs)

When hdpe (pe100) pipes are hydrostatically tested at 20 °c, a minimum required strength at 50 years of  10 mpa  (100 dan / cm² ) - mrs100.

 Design stress

The design stress for mdpe (pe 80) pipes is 5mpa

The design stress for "hi strength " hdpe (pe100) pipes is 8 mpa. The following table shows the comparison between the 50 years mrs values for mdpe (pe80) and hppe (pe100) pipes.

A new high performance hdpe (pe 100) polyethylene pipe material for use in underground potable

Water mains. The new material's higher permissible design strength  (pe 100)- 8mpa:pe80 – 5mpa), together with its superior toughness, allows the design engineer to use  hdpe (pe 100) pipes at substantially higher operating pressures than  mdpe (pe 80) pipes with equivalent sdr  rating.

The enhanced performance allows hdpe (pe 100) pipes to be produced with thinner pipe walls than mdpe (pe 80) pipes of equivalent  sdr rating.

In addition to their superior qualities, hdpe (pe 100) also has greater resistance to rapid crack propagation.

Standard dimension ratio (SDR)

 In polyethylene pipes of 25 mm nominal size and above, the pipe wall thickness bears a constant ratio to the outside diameter, for a given pressure rating. This is known as the standard dimension ratio (sdr), which is calculated as follows:

 

Nominal outside diameter /minimum wall thickness = sdr e.g. The sdr of a 90 mm, 10 bar rated mdpe (pe 80) pipe  90 / 8.2=sdr11.  The sdr of a 90 mm, 10 bar rated, hdpe (pe100) pipe is:-

 

90/5.1 = sdr 17.6 

Pressure rating

 The pressure rating of polyethylene pipes is generally referred to in 'bar', where 1 bar equals 10.2m head (approx). Table 1 gives the pressure rating and sdr of both mdpe (pe 80)  and  hdpe (pe 100) pipes. 

Nominal

Size

Mm

Medium density (pe 80)

High performance (pe 100)

Sdr

Max. Rated working pressure

Sdr

Max. Rated working pressure

20

Sdr 9

 

12 bar

-

-

25-63

Sdr 11

12 bar

-

-

90-180

Sdr 11

Sdr 17.6

12 bar

7.5 bar

Sdr  11

Sdr  17.6

16 bar

10  bar

250-1000

Sdr 11

Sdr  17.6

10 bar

6 bar

Sdr  11

Sdr  17.6

16bar

10bar

                           sdr and maximum rated working pressures  

Pn(10 - 12.5) sdr (17 - 13.6) elbow 90 °

Od

Z

R

S

I

110

95.00

55.0

8.10

40

125

102.50

62.5

9.20

40

140

120.00

70.0

10.30

50

160

130.00

80.0

9.50

50

180

140.00

90.0

10.70

50

200

150.00

100.0

11.90

50

225

162.50

112.5

13.40

50

250

508.00

375.0

11.04

200

280

545.00

420.0

11.86

200

315

688.00

472.5

17.57

300

355

737.00

532.5

22.35

300

400

792.00

600.0

28.25

300

450

854.00

675.0

35.80

300

500

916.00

750.0

44.10

300

 

Pn(10 - 12.5) sdr (17 - 13.6) elbow 45 °

Od

Z

R

S

I

110

--

55

8.1

40

125

--

62.5

9.2

40

140

--

70

10.3

50

160

--

80

9.5

50

180

--

90

10.7

50

200

--

100

11.9

50

225

--

12.5

13.4

50

250

 

375.0

11.04

200

280

 

420

13.86

200

315

 

472.5

17.57

300

355

 

532.5

22.35

300

400

 

600.0

28.25

300

450

 

675.0

35.80

300

500

 

750.0

44.10

300

 

  

 

 

 

 

 

 

 

 

 

 

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