BS EN 12285-3:2019 pdf download.Workshop fabricated steel tanks Part 3: Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids for heating and cooling of buildings.
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/I 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 x 103 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the PUPOSCS of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http:J/wwwio.orgJobp
3.1.1 tank workshop fabricated cylindrical containment for the storage of liquids
NOTE Tanks arc made of steel plates, equipped with dished ends and consist of one or more compartments.
3.1.2 underground tank tank which is totally or partially imbedded in the ground
3.1.3 compartment single fluid storage space within a tank
3.1.4 single skin tank impermeable containment consisting of a tank of single containment
Note Ito entry: A single skin tank also constitutes the inner skin of a double skin tank. Note 2 to entry: See Figurel.
4 Product characteristics
4.1 General
The tank material shall be suitable for long term contact with the stored media. Guidelines on material specifications in relation to stored media is provided in EN 12285-1:2018, Annex 13.
The safe working capacity of the tank should usually not exceed 97 % of the nominal volume at ambient temperatures (—20 °C to +50 °C).
4.2 Manufacturing
4.2.1 Qualification of the company and welding qualification of the personnel
The manufacturer has to prove that he is able to master the procedures necessary for manufacturing the tanks in a proper manner.
The manufacturer can prove this by means of a welding certificate for execution class EXC 2 in accordance with EN 1090-2 or a higher class. In deviation of EN 1090-2:2008+A1:201L Table 14, the welding coordination personnel responsible for coordinating the manufacturing process of the tanks has to have special technical expertise in accordance with IN ISO 14731.
4.2.2 Types of joints
Welding procedures shall be in accordance with EN ISO 15607, EN ISO 15609-1, EN ISO 15614-1.
The welding related to the different types of joints is given in Table 1. The types of welded joints shall be in accordance with Table 1. All internal attachments shall be continuously welded.BS EN 12285-3 pdf download.