Longitudinally welded black pipes for pressure installations produced according to EN10217-2 standard

Green Stal is direct importer

Longitudinally welded black pipes for pressure installations produced according to EN10217-2 standard

The EN10217-2 standard describes the production process for steel pipes used for pressure installations made of non-alloy and alloy steel, welded longitudinally electric by pressure, with specified characteristics at elevated temperature.

The EN10217-2 compatible steel that Green Stal Trading can sell, from stock or based on firm order, is P235GH.

Very careful, before installation, installers must check:

  • the labels on the pipes vs quality certificates;
  • pipes must be marked with EN10217-2 and P235GH;
  • do not install high pressure and high temperature hoses that are not marked with labels and EN10217-2 / P235GH.

The steel designation for non-alloy steel grades is symbolized by:

  • capital letter P, indicating use under pressure;
  • indication of the specified minimum value of the flow limit for thicknesses T less than or equal to 16 mm, expressed in MPa (see column 3 of the MECHANICAL PROPERTIES table below);
  • GH symbols for high temperature.

Steels compatible with EN10217-2 are listed in the tables below:

Chemical composition (casting analysis) in % by mass:

According to the classification system of EN10020, in this standard, the steel grades P195GH, P235GH and P265GH are classified as non-alloy quality steels and the steel grade 16Mo3 is classified as special alloy steel.

Mechanical properties:

Values of the conventional minimum flow limit, Rp0.2, at elevated temperature for wall thicknesses below 16 mm.

EN10217-2 welded black pipes are not used for drinking water.

Please view the attached section of the website – PRODUCT ACTS

Purpose and scope

EN10217-2 – Distribution of aqueous liquids at elevated temperatures

Pipe dimensions (see link):

  • Outer diameter: 21.3mm-323.9mm;
  • Wall thickness: 2.60-8mm;
  • Bar length: usually 6.00mm (+/-50mm);

Pipe durability: depending on the temperature, pressure and liquids used – this decision will be made by the engineer. Obviously, the temperature of the liquids transmitted through the pipes, the wall thickness and the environment where the pipe is installed play a key role.

Pipe finishes (pipe ends): flat ends (chamfered or straight cut).

Quality certificates

All pipes delivered by Green Stal are accompanied by a Quality Certificate (MTC-MILL TEST CERTIFICATE) issued by the manufacturer and a Declaration of Conformity issued by Green Stal;

Leak tightness for pipes produced according to EN10217-2

All pipes must be leak tight. Leak tightness shall be demonstrated by hydrostatic testing or electromagnetic testing. The test can be either a hydrostatic test or an electromagnetic test according to EN ISO 10893-1.

Hydrostatic testing

The hydrostatic test shall be carried out at a test pressure of 70 bar or at a test pressure P calculated with the following relation, whichever is the lower value:

P is the test pressure, in bar;
D is the specified outside diameter, in mm;
T is the specified wall thickness, in mm;
S is the stress, in MPa, corresponding to 70 % of the minimum flow limit specified
for the particular steel grade.
The Test Pressure shall be maintained for a minimum of 5 s, in the case of pipes with an outside diameter D ≤ 457 mm and a minimum of 10 s, in the case of pipes with an outside diameter D > 457 mm.
Pipes shall withstand the test without leakage.

Handling and storage techniques at construction sites / warehouses

Black pipes must be handled with great care (only with forklifts that can handle heavy weights, cranes, etc.), as they are very heavy and any improper handling can cause serious personal injury. Also, if strong blows are applied to the pipes, if a bar falls from a distance of more than 1 meter, if a pipe tie falls from heights greater than 20cm on one of the bars located on the hexagonal edges of the tie, the pipe may lose its mechanical properties and especially leaks may occur on the weld of the pipe.

Black pipes should not be stored in damp environments, in environments with basic or acidic substances, mortar, cement water, cement, lime etc.

Black and galvanized pipes should not be in direct contact with the ground, and also in damp, sandy, concrete, cement, marble etc. environments the pipes should be covered with a polyethylene tarpaulin.