EN 10208 Steel pipes for pipelines for combustible fluids

EN 10208 Steel pipes for pipelines for combustible fluids are used for transporting gas, oil, combustible fluids with specific pressure in the mining, chemical, and power engineering industry.

The pipes are manufactured with the diameters between 21,3 – 660 mm and with the wall thickness of up to 40 mm in the case of hot rolled seamless pipes, and with the diameters between 10,2 – 108 and with the wall thickness of up to 10 mm in the case of cold drawn seamless pipes.

BS EN 10208 Seamless Steel pipes for pipeline for flammable fluids.

Technical delivery situations. Standard description

The pipes are utilised for transporting gas, oil, combustible fluids with certain stress inside the mining, chemical, and power engineering sector.

The pipes are manufactured with all the diameters amongst 21,3 - 660 mm and using the wall thickness of as much as 40 mm within the case of hot rolled seamless pipes, and with all the diameters between 10,2 - 108 and together with the wall thickness of as much as ten mm inside the case of cold drawn seamless pipes.

Manufacturing
seamless steel pipes and welded steel pipes.

Steel grades used requirement class A

BS EN 10208-2 is the European regular that specifies the technical delivery conditions for seamless and welded steel pipes for the on land transport of combustible fluids mostly in gas provide systems but excluding pipeline applications inside the petroleum and all-natural gas industries. It consists of far more stringent quality and testing needs than those in BS EN 10208-1.

Steel pipes for pipeline transportation systems inside the petroleum and natural gas industries are covered by ISO 3183. BS EN 10208-2 specifies products with the identical (and additional) strength levels and partly related (but not identical) specifications as EN 10208-1 and EN 10208-2 and is with two extra annexes specifying deviating or extra needs also published as API Spec 5L.

BS EN 10208-2 does not apply to cast steel pipe.

It was the intention, when preparing this document, to avoid specifying the high-quality of line pipe to become utilised to get a certain application. Nonetheless, it was recognized that there are actually several high quality levels commonly made use of, and it was decided to reflect these inside the common by the differentiation involving two high-quality levels.

Firstly, the need was recognized to supply a standard top quality level. This really is designated requirement class A and considered in BS EN 10208-1.

Secondly, a lot of purchasers impose needs extra towards the basic regular, as an illustration concerning toughness and non-destructive inspection. This method is popular, as an example, for transmission pipelines.

Such enhanced needs are addressed in requirement class B and regarded in BS EN 10208-2.

For offshore applications and also other applications outside the scope of BS EN 10208-1 and BS EN 10208-2, other requirements may perhaps be applicable, e.g. ISO 3183.

The Charpy impact power needs within this document happen to be derived from established data, in accordance with EPRG recommendations, and are intended to prevent the occurrence of extended running shear fracture in pipelines transporting clean, dry natural gas. It truly is the duty from the designer to determine irrespective of whether these energy requirements suffice for the intended application. One example is, rich gas or two-phase fluids may well need additional testing to become carried out.

For pipes of requirement class B, a weld efficiency issue of 1,0 might be utilized in design calculations, because of the conditions specified for the manufacture of the pipes and for the testing with the tubes.

The selection of the requirement class will depend on lots of components: the properties in the fluid to be conveyed, the service conditions, design and style code and any statutory requirements must all be taken into consideration. BS EN 10208-2 provides no detailed suggestions. It is actually the ultimate duty of the user to choose the appropriate requirement class for the intended application.

This document combines a wide array of item varieties, dimensions and technical restrictions in accordance with the functional specifications for gas supply systems referred to in BS EN 1594 Gas provide systems. Pipelines for maximum operating pressure more than 16 bar. Functional needs.

Pipe types and the manufacturing process (original material, plastic forming and thermal processing state)

Pipe type Original material Plastic forming of the pipe1) Thermal processing state Thermal processing symbol
Seamless (S) Ingot or block Hot rolling Normalization or normalization plastic forming N
Heat treatment Q
Hot rolling and cold finishing Normalization N
Heat treatment Q
High frequency welding (HFW) Normalized rolled strips Cold forming Normalization of the weld area N
Thermomechanically rolled strips Heat treated weld area M
Hot rolled strips or normalized rolled strips Cold forming and reduction with hot tensioning at controlled temperature so as to achieve a normalized state Normalization (whole pipe) N
- N
Submerged arc welding (SAW) -longitudinal (SAWL) -spiral (SAWH) or combined welding (COW) -longitudinal (COWL) –spiral (COWH_ Normalized or normalized rolled sheets or strips Cold forming - N
Thermomechanically rolled sheets or strips
Rolled sheets or strips Normalization plastic forming - M
Normalized or normalized rolled sheets or strips N

Chemical composition according to the ladle analysis for the wall thickness of  < or= 25mm

Steel  designation Maximum content, % CEV max.
Steel symbol C Si Mn P S V Nb Ti Other
Steels for seamless and welded pipes
L245NB 
L290NB 
L360NB 
L415NB
0,16
0,17
0,20
0,21

0,40
0,40
0,45
0,45

1,1
1,2
1,6
1,6

0,025
0,025
0,025
0,025


0,05 
0,10 
0,15


0,05
0,10
0,15


0,05
0,05
0,05


0,04
0,04
0,04

  0,42 
0,42 
0,42 
0,45 
to be negotiated
Steels for seamless pipes
L360QB 
L415QB 
L450QB 
L485QB 
L555QB
0,16
0,16
0,16
0,16
0,16
0,45
0,45
0,45
0,45
0,45
1,4
1,6
1,6
1,7
1,8
0,025
0,025
0,025
0,025
0,025
0,020
0,020
0,020
0,020
0,020
0,05
0,08
0,09
0,10
0,10
0,05
0,05
0,05
0,05
0,06
0,04
0,04
0,06
0,06
0,06
  0,42 
0,43 
0,45 
0,45 
to be negotiated
Steels for welded pipes
L245MB 
L290MB 
L360MB 
L415MB 
L450MB 
L485MB 
L555MB
0,16
0,16
0,16
0,16
0,16
0,16
0,16
0,45
0,45
0,45
0,45
0,45
0,45
0,45
1,5
1,5
1,6
1,6
1,6
1,7
1,8
0,025
0,025
0,025
0,025
0,025
0,025
0,025
0,020
0,020
0,020
0,020
0,020
0,020
0,020
0,04
0,04
0,05
0,08
0,10
0,10
0,10
0,4 
0,4 
0,5 
0,5 
0,5 
0,6 
0,6


0,04
0,06
0,06
0,06
0,06
  0,40 
0,40 
0,41 
0,42 
0,43 
0,43 
to be negotiated

Required tension and bending test results for the wall thickness of < or = 25mm and of the pressure water test

Steel designation Pipe body (seamless pipe and welded pipe) Spiral weld Whole pipe
HFW, SAW, COW SAW, COW
Steel symbol Plastic limit R 10,5N/mm 2 Tensile strength R mN/mm 2min. R10,5/RmMax Elongation A% min. Tensile strength R mN/mm 2min Diameter of the bending mandrel bar in the bending test Pressure water test
L245NB 
L245MB
245 to 440 415 0,80 
0,85
22 The same values as for the pipe body apply 3T Every pipe should be subject to the test and it should be free of any leaks or deformations
L290NB 
L290MB
290 to 440 415 0,85 
0,85
21 3T
L360NB 
L360QB 
L360MB
360 to 510 460 0,85 
0,88 
0,85
20 4T
L415NB 
L415QB 
L415MB
415 to 565 520 0,85 
0,88 
0,85
18 5T
L450QB 
L450MB
450 to 570 535 0,90 
0,87
18 6T
L485QB 
L485MB
485 to 605 570 0,90 
0,90
18 6T
L555QB 
L555MB
555 to 675 625 0,90 
0,90
18 6T


Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

Delivery status Abbreviation Description

Cold-finished/hard
(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery according to actual weight or delivery according to theoretical weight

  • Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;
  • Theoretical weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel.
 


SUNNY STEEL

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Link exchange

Copyright © 2011 Sunny Steel Enterprise Ltd.  All Rights Reserved ICP No.:08010763