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New and Old DIN Designations: Article & Quiz with 7 MCQs II A Comprehensive Guide

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New and Old DIN Designations Quiz

1. New and Old DIN Designations: What does the letter “P” signify in the new DIN EN system for pipes?

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2. Which series replaces old standards like DIN 1629 and 17175 for pressure pipes in the new system?

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3. What do DIN 17120 and 17121 refer to, and what are their replacements in the new system?

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4. What is the replacement series for old DIN standards like DIN 2605, 2615, 2616, and 2617 for butt-welding pipe fittings?

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5. What is the replacement series for old DIN flange standards like DIN 2513, 2526, and 2527 in the new system?

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6. What is the significance of the letter “P” in the new system for pipes?

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7. What is the current status of API standards for pipeline applications according to the information provided?

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New and Old DIN Designations: A Comprehensive Breakdown

This article sheds light on the evolution of DIN standards for pipes, fittings, and flanges, highlighting the transition from old designations to the new EN and DIN EN system. Here’s a breakdown of the key points:

Old vs. New System:

  • Many old DIN standards like DIN 1629, 17175, and 17121 have been replaced by Euronorms with distinct designations for different applications (pressure, construction, pipelines).
  • The new system uses “P” for pressure pipes, followed by a number indicating minimum yield strength and additional letters for specific properties (e.g., P235TR2).

Pressure Pipes:

  • EN 10216 series replaces old standards like DIN 1629 and 17175.
  • Different parts cover non-alloy pipes at room/elevated temperatures and alloy fine grain steel pipes.
  • Examples: EN 10216-1 P235TR2 (formerly DIN 1629, St.37.0), EN 10216-2 P235GH (formerly DIN 17175, St.35.8 Cl. 1).

Construction Pipes:

  • DIN 17120 and 17121 are replaced by DIN EN 10210 and 10219.
  • These standards specify technical delivery conditions for hot-finished and cold-formed welded structural hollow sections.
  • Examples: DIN EN 10210-1/2 S235JRH, DIN EN 10219-1/2 S355J2HS.

Pipeline Pipes:

  • Replaced by DIN EN 10208, with three parts specifying technical conditions for pipes of different requirement classes.
  • Examples: DIN EN 10208-2 L245NB, DIN EN 10208-2 L360NB (replacing API 5L grades).


  • DIN 2605, 2615, 2616, and 2617 replaced by DIN EN 10253 series for butt-welding pipe fittings.
  • Different parts cover carbon steel, non-alloy and ferritic alloy steel, and austenitic stainless steels.


  • Old DIN 2513, 2526, 2527, etc. replaced by DIN EN 1092 series for circular flanges.
  • Different parts cover steel, cast iron, copper alloy, and aluminium alloy flanges with specific PN designations and pressure/temperature ratings.

Additional Notes:

  • API standards for pipeline applications remain valid for now.
  • The document provides detailed descriptions of each relevant DIN EN standard and its corresponding old designation.

Overall, this information helps engineers, manufacturers, and other stakeholders navigate the transition from old DIN standards to the new harmonized system, ensuring accurate selection of suitable materials for various applications.

I hope this summary clarifies the information presented in the article. Feel free to ask any further questions you may have about specific standards or their applications!

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