Seamless steel tubes for transportation of flammable media - line pipes
Standards and steel grades,
Tube sizes acc. to EN standard,
Tube sizes acc. to API 5L standard.
Seamless steel tubes for transportation of flammable fluids are produced by hot rolling. The semi-finished product used for these tubes is continuously cast bloom. This group of tubes is mainly set for high pressure pipelines to deliver gases, oil and other flammable fluids in the mining, chemical and energy industry. Line pipes are made from carbon and alloyed steel. Overview of the dimensional standards and technical-delivery conditions by which line pipes are manufactured and supplied is shown in a separate overview.
a separate overview.. Steel is made in the electric arc furnace and it is fully killed.
Line pipe - delivery condition and surfaceUsually the tubes are supplied as hot rolled. Only tubes with DN 6 -10, perhaps tubes of other dimensions are supplied as cold drawn and after forming they are heat treated. This is done as per precious agreement. The tube surface meets corresponds to the means of manufacturing.
Line pipe - length
|Diameter (OD) [mm]||Wall (WT) [mm]||Length (L) [m/ft]|
|OD < 60,3||5 – 6 m (16 – 20 ft)|
|OD => 60,3||WT < 7,1||5 – 6 m or 10 – 12 m (16 – 20 or 32 – 40 ft)|
|WT => 7,1||5 – 6 m (16 – 12 ft)|
Line pipe - straightnessTubes are visually straight.
Ends of the tubesEnds of tubes are smooth, without threads.
From 60.3 diameter beveled according to standards:
DIN, EN - a = 40° - 60°, c = to 2 mm
ASME - a = 75° ± 5°, c = 1,6 ± 0,8 mm
Marking of the tubes and tube bundlesTubes with diameter up to 1 ½” are marked with label on the bundle. Tubes with larger diameter than 1 ½” are implemented according to directives or upon request.
Line pipe - surface protectionLine pipes are supplied without temporary protection against corrosion. Upon request it is possible to deliver tubes with agreed upon anticorrosion protection. The tube ends may be enclosed by a plastic plug.
Line pipe - testingTubes are tested according to requirements of the appropriate standards. In all ceases the tube leaking test is performed. Tubes meet the directive requirements NACE MR 0175. covering resistance to acid environment (SSC – Sulfide Stress Cracking). When ordering the tubes it is possible to agree upon the carbon content value (CEV).
Certified test reports for line pipeAPI 5L
EN 10204 – 2.2, 3.1, 3.2