CEN/TC 265/WG 8 - Shop fabricated tanks

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 is required.
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 document specifies the product characteristics and test 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) and installed in industrial processes or in petrol stations at normal ambient temperature conditions (−20 °C to +50 °C) within the following limits:
-   from 800 mm up to 3 000 mm nominal diameter and;
-   up to a maximum overall length of 6 times the nominal diameter;
-   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.
Tanks designed to this standard allow for an earth cover of up to 1,5 m. If there are imposed traffic loads or a greater earth cover, calculation is expected to be carried out.
This document is not applicable to tanks used for storage and/or supply of fuel/gas for building heating/cooling systems, and of hot or cold water not intended for human consumption, nor to loads and special measures necessary in areas subject to risk of earthquakes.
Guidance on installation of tanks is presented in Annex A, which does not include special measures that might be necessary in areas subject to flooding.
This document is not applicable for the storage of liquids having dangerous goods classes listed in Table 1 because of the special dangers involved.
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NOTE   The classifications referred to are those adopted by the United Nations Committee of Experts on the Transport of Dangerous Goods (not to be interpreted as tank classes described in 6.2).

This document specifies the requirements for metallic shop fabricated cylindrical vertical steel tanks, single and double skin for the aboveground storage of water polluting liquids (both flammable and non-flammable) within the following limits:
—   from Ø 1250 mm up to Ø 4 000 mm inner tank nominal diameter, and
—   up to maximum overall shell length of 6 times the nominal inner tank diameter (or max 14 m shell lenght Lz), and
—   tank possible to be divided from 1 to 5 compartments,
—   for liquids with maximum density of up to 1,9 kg/l, and
—   with an operating pressure (P0) of maximum 50kPa (0,5 bar (g)) and minimum – 5 kPa (- 50 mbar (g)), and
—   where double skin tanks with vacuum leak detection system are used the kinematic viscosity of the stored media shall not exceed 5 × 10−3 m2/s.
This document is applicable for normal ambient temperature conditions (−40 °C to + 50 °C). Where temperatures are outside this range, additional requirements need to be taken into account.
This document is not applicable to tanks used for storage and/or supply of fuel/gas for building heating/cooling systems, and of hot or cold water not intended for human consumption, nor to loads and special measures necessary in areas subject to risk of earthquakes.
This document is not applicable for the storage of liquids having dangerous goods classes listed in Table 1 because of the special dangers involved.
Table 1 - List of dangerous goods which are not covered by this document
UN-classification   Type of dangerous goods
Class 1   Explosives
Class 4.2   Substances liable to spontaneous combustion
Class 4.3   Substances which in contact with water emit flammable gases
Class 5.2   Organic peroxides
Class 6.2   Infectious substances
Class 7   Radioactive substances, hydrocyanic or hydrocyanic solvent liquids, metal carbons, hydrofluoric acid, bromide liquids
NOTE   The classifications referred to are those adopted by the United Nations Committee of Experts on the Transport of Dangerous Goods (not to be interpreted as tank classes described in 6.2).

This standard 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) 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 1,9 kg/l and,
   with an operating pressure (Po) of maximum 1,5 bar (abs.) and,
   for double skin tanks with a vacuum leak detection system where the kinematic viscosity does not exceed 5  10-3 m2/s.
Tanks designed to this standard allow for an earth cover of 1.5m and for the tank to withstand traffic loads from a properly constructed roadway
This standard is not applicable for the storage of liquids having dangerous good classes listed in Table 1 because of the special dangers involved.