Classification of VESBO PE Pipes according to TS-418-1 Pr EN 12201

Type MRS (bar) Hoop Stress (bar)  
PE 32 32 25
  • MRS : Minimum Required Strength. Safety Factor is 1.25
  • Operating Pressure:
    P=2.t.?
    D-t
  • P: Operating Pressure (bar)
  • T : Wall Thickness (mm)
  • ? : Hoop Stres (bar)
  • D : Nominal Outer Diameter (mm)
PE 40 40 32
PE 63 63 50
TPE 80 80 63
PE 100 100 80

Raw Material

As a result of developments in extrusion and injection Technologies, PE raw material has been used for more than 50 years in pipe and fitting applications. Above classification table shows the types of PE raw material which are commonly used in pipe production.

Example:

For a PE 32 pipe with an outer diameter of 110mm and operating pressure of 10bars, 18.4mm wall thickness will be necessary while for PE 100 pipes only 6.5mm wall thickness is sufficient. The reduction of the wall thickness will result in cost saving due to the minimized weight of pipe.

With the improvement in impact value of PE raw material used in pipe production, market share of PE pipes increases rapidly and represents a real alternative to conventional materials such as steel.

Physical Properties:

  • Density >950 kg/m3
  • Elongation At Break : >600%

Properties of Vesbo PE 100 Pipes:

  1. Flexible
  2. Easy and reliable welding
  3. High resistance to crack growth
  4. Minimum 50 years projected service life
  5. High resistance to chemicals
  6. High impact strength
  7. Light weight and easy to handle
  8. Low pressure loss
  9. Comprehensive product range: PN 6 – PN 16; ø20- ø630
  10. Coil packing for ø20 - ø125 pipes and production of 6m and 12 m length pipes for ø125 – ø630

Classification

Polyethylene pipes can be classified according to the following criteria : Relation between these criteria :
  1. Minimum Required Strength of the Raw Material (MRS)
  2. Serial Number (S)
  3. Standard Dimension Ratio (SDR)
  4. Nominal Pressure (PN)
  5. Outer Diameter of the Pipe (D)
  • PN : Nominal Pressure (bar)
  • t : Wall thickness (mm)
  • S : Pipe Serail Number
  • ø : Hoop Stress (bar)
  • C : Safety factor
  • MRS: Minimum Required Strength (bar)
  • D : Nominal Outer Diameter (mm)

Joining Techniques

Electrofusion Welding Technique Butt Fusion
  1. There are two basic elements of electrofusion welding technique
  2. Electrofusion fitting
  3. Electrofusion welding machine

Electrofusion fitting (EF) is a pipe joining element including electrical resistance coils inside. Electrofusion welding machine applies automatically necessary current during fusion period.

After pipe ends that will be joined are interested in EF fittings, energy is applied by the EF welding machine to the EF fitting through resistance coils which causes the material to melt and leading to fusion of the pipe and the socket.

This joining method is usually preferred for the big (>63 mm) diameter pipes. This principle of butt fusion is to heat the surfaces of the two pieces to a designated temperature, and then fuse them together by applying of a sufficient force. This force causes the melted materials to flow and mix to each other.

 

Handling and Storage

General Instructions :

  1. Pipes should not be dragged on the ground.
  2. Pipes should be covered with a black polyethylene sheet if the storage period exceeds 12 months.
  3. Pipe ends should be protected from dirts.

Loading / Unloading

  1. Lifting points should be determined symmetrically on either side of the pipe center.
  2. Standard sized pipes of 6m can be lifted by fork-lift truck.
  3. Pipes must not be dropped or rolled from the trucks.

Precautionary Measures During Installation Of VESBO PE 100 Pipes

  1. Trench should be dug vertically up to 1.5m depth.
  2. Inclinations and directions determined in the project should be considered.
  3. Before laying the pipes down, the base of the trench should be cleared off from rocks, stones and any other sharp material that can damage the pipes.
  4. If the base of the trench bottom is not suitable for laying down the pipes, sharp materials (rocks, stones, etc.) should be covered by a bedding of 5-10cm height.
  5. The excavated soil can be used for backfilling. Compacting should not exceed the proctor rate of 95%.

Coil Pipes

  1. Coil pipes should be untied with care due to the stored potential energy.
  2. Coil ends should be released under control and all belts should not be released at the same time

VESBO PE 80

Natural Gas Pipes Physical properties

VESBO PE 80 pipes are produced according to TS-10827 and produced in yellow color to be distinguished from other networks.

  • Density : 930 kg/m3
  • Elongation At Break : >500 %

VESBO produces PE 80 natural gas pipes under SDR 11 classification.

Te Deum Engineering Pte Ltd
143 Kallang Way 1,
Singapore 349186.
TEL: +65 6742 9131      FAX: +65 6744 6403