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Specification for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above

Executive summary

Requirements for the design, manufacture and inspection of steel tanks for the storage of liquids at ambient temperature and above.


This European Standard specifies the requirements for the materials, design, fabrication, erection, testing and inspection of site built, vertical, cylindrical, flat bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperatures and above, and the technical agreements that need to be reached.

This standard is concerned with the structural integrity of the basic tank structure and does not provide requirements for considering process design, operational issues, safety and firefighting facilities, in-service inspection, maintenance or repair.

This standard applies to closed-top tanks, with and without internal floating covers and open-top tanks, with and without floating roofs. It does not apply to 'lift-type' gas holders. It is also applicable to steel tanks with a maximum design strength of  60 N/mm2. This standard does not apply to tanks where the product is refrigerated to maintain it as a liquid at atmospheric pressure.

This standard applies to storage tanks with the following characteristics:

a) design pressure less than 500 mbar and design internal negative pressure not lower than 20 mbar;

b) design metal temperature not lower than -40 degrees C and not higher than +300 degrees C;

c) maximum design liquid level not higher than the top of the cylindrical shell.

The limits of application of this Standard terminate at the following locations.

- face of the first flange in a bolted flange connection;

- first threaded joint on the pipe or coupling outside of the tank shell, roof or bottom;

- first circumferential joint in a pipe not having a flange connection.

History and related standards

This European Standard supersedes BS 2654:1989 which is withdrawn.

This Standard includes the following cross-references:

EN 287-1:2004, EN 288-2, EN 444, EN 462-1, EN 462-2, EN 473, EN 485 (all parts), EN 499, EN 571-1, EN 754 (all parts), EN 755 (all parts), EN 970, EN 1092-1, EN 1290, EN 1418, EN 1435, EN 1593, EN 1600, EN 1714, prEN 1759-1:2000, EN 1991-1-3:2003, EN 10025:1992, EN 10028-2: 1993, EN 10028-3:1993, EN 10029:1991, EN 10045-1, EN 10088-1, EN 10088-2:1995, EN 10088-3:1995, EN 10113-2:1993, EN 10113-3:1993, EN 10204: 2004, EN 10210-1:1994, EN 10216-1, EN 10216-2, EN 10216-3, EN 10216-5, EN 10217-1, EN 10217-2, EN 10217-3, EN 10217-5, prEN 10217-7, EN 10222 (all parts), EN 10250 (all parts), EN 12874, ENV 1991-2-1, ENV 1993-1-1, ENV 1993-4-2, EN ISO 4063,

EN ISO 6520-1, EN ISO 14122-1, EN ISO 14122-2, EN ISO 14122-3,

EN ISO 14122-4, EN ISO 15607:2003 and EN ISO 15614-1:2004.

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