TRRTP261 - Decree on the storage of hazardous liquids in fixed storage facilities

This document specifies the product characteristics and test/assessment methods for workshop
fabricated cylindrical, horizontal steel tanks, single (type S) and double skin (type D) intended to be
used for the underground storage of water polluting liquids (both flammable and non-flammable),
specifically used for storage and/or supply of fuel for building heating/cooling systems, and of hot or
cold water not intended for human consumption at normal ambient temperature conditions (−20 °C to
+50 °C) within the following limits:
— from 800 mm up to 3000 mm nominal diameter and;
— up to a maximum overall length of 6 times the nominal diameter;
— for liquids with a maximum density of up to 1,1 kg/l and;
— with an operating pressure (Po) of maximum 50 kPa (0,5 bar(g)) and minimum – 5 kPa (–50
mbar(g)) and;
— for double skin tanks with a vacuum leak detection system where the kinematic viscosity does not
exceed 5 × 10−3 m2/s.
Two tank types are distinguished:
— Type S: Single skin;
— Type D: Double skin.
Tanks designed to this document allow for an earth cover of up to 1,5 m. If there are imposed traffic
loads or a greater earth cover, calculation will occur.
This document is not applicable to tanks installed in industrial processes or in petrol stations, nor to
loads and special measures necessary in areas subject to risk of earthquakes and/or to flooding.

This part of EN 13121 gives requirements for the design, fabrication, inspection, testing and verification of GRP tanks and vessels with or without thermoplastics lining for storage or processing of fluids, factory made or site built, non-pressurised or pressurised up to 10 bar, for use above ground.
The terms vessels and tanks as used in this part of EN 13121 include branches up to the point of connection to pipe work or other equipment by bolting and supports, brackets or other attachments bonded directly to the shell. In addition to the definitive requirements, this part of EN 13121 also requires the items in Clause 5 to be fully documented.
This part of EN 13121 covers vessels and tanks subject to temperatures between – 40 °C and 120 °C.
It is possible that future advances in resin technology would allow tanks and vessels to be considered for operating temperatures above 120 °C. Should such a situation arise and a manufacturer wishes to take advantage of such developments then all other requirements of this standard shall be maintained and such tanks and vessels shall only be designed in accordance with the advanced design method given in 7.9.2.
Excluded from this part of EN 13121 are:
-   tanks and vessels for the transport of fluids;
-   underground storage tanks;
-   spherical vessels;
-   vessels and tanks of irregular shape;
-   tanks and vessels with double containment;
-   tanks and vessels which are subject to the risk of explosion, or failure of which may cause an emission of radioactivity;
-   specification for fibre reinforced cisterns of one piece and sectional construction for the storage, above ground, of cold water. (see EN 13280:2001).-

This International Standard contains requirements for the competence of bodies performing inspection and for the impartiality and consistency of their inspection activities. It applies to inspection bodies of type A, B or C, as defined in this International Standard, and it applies to any stage of inspection.

TC - Modification to Table A.1

This document 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 (see Annex A).
This document does not apply to tanks where the product is refrigerated to maintain it as a liquid at atmospheric pressure (see prEN 14620).
This document 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. These aspects are covered in detail in other Codes of Practice (see Annex B).
1.2   This document applies to closed-top tanks, with and without internal floating covers (see Annex C) and open-top tanks, with and without floating roofs (see Annexes D and E). It does not apply to 'lift-type' gas holders.
1.3   This document 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 (see 5.1 for pressure limitations);
b)   design metal temperature not lower than -40 °C and not higher than +300 °C (see 5.2.2);
c)   maximum design liquid level not higher than the top of the cylindrical shell.
1.4   The limits of application of this document 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.
1.5 This document is applicable to steel tanks with a maximum design strength L 260 N/mm2.
1.6   In addition to the definitive requirements, this document also requires the items detailed in Annex A to be documented. For compliance with this document,

This European Standard gives requirements for chemical resistance of composite materials used for GRP tanks and vessels for storage or processing of fluids, for use above ground. The tanks or vessels may be factory made or site built, with or without lining.

This European Standard gives requirements for acceptance and usage conditions of raw materials for GRP tanks and vessels with or without lining for storage or processing of fluids, factory made or site built, non pressurised or pressurised, for use above ground.