BS EN 14620-1:2006 pdf download – Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and p165 °C — Part 1: General 4 Concept selection 4.1 Types of tank 4.1.1 Single containment A single containment tank shall consist of only one container to store the liquid product (primary liquid container). This primary liquid container shall be a self-supporting, steel, cylindrical tank. The product vapours shall be contained by: either the steel dome roof of the container; or, when the primary liquid container is an open top cup, by a gas-tight metallic outer tank encompassing the primary liquid container, but being only designed to contain the product vapours and to hold and protect the thermal insulation. NOTE 1 Depending on the options taken for vapour containment and thermal insulation; several types of single containment tanks exist. A single containment tank shall be surrounded by a bund wall to contain possible product leakage. NOTE 2 For examples of single containment tanks, see Figure 1. 4.1.2 Double containment A double containment tank shall consist of a liquid and vapour tight primary container, which itself is a single containment tank, built inside a liquid-tight secondary container. The secondary container shall be designed to hold all the liquid contents of the primary container in case it leaks. The annular space, between the primary and secondary containers, shall not be more than 6,0 m. NOTE 1 The secondary container is open at the top and therefore cannot prevent the escape of product vapours. The space between primary and secondary container can be covered by a “rain shield” to prevent the entry of rain, snow, dirt etc. NOTE 2 For examples of double containment tanks, see Figure 2. 4.1.3 Full containment A full containment tank shall consist of a primary container and a secondary container, which together form an integrated storage tank. The primary container shall be a self-standing steel, single shell tank,holding the liquid product. The primary container shall: either be open at the top, in which case it does not contain the product vapours  or equipped with a dome roof so that the product vapours are contained. The secondary container shall be a self-supporting steel or concrete tank equipped with a dome roof and designed to combine the following functions:  in normal tank service: to provide the primary...

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