EN 12573-3:2000

Foreword
1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
   3.1 Definitions
   3.2 Symbols and abbreviations
4 General considerations in design calculations
5 Unstiffened tanks sitting on a continuous flat rigid surface
   5.1 General
   5.2 Aspect ratio x/y < 0,5
   5.3 Aspect ratio 0,5 <= x/y <= 4
   5.4 Aspect ratio x/y > 4
6 Tanks with rim stiffening supported on a continuous flat
   rigid surface
   6.1 Calculation of the skin thickness
   6.2 Calculation of rim stiffeners
7 Tanks with intermediate horizontal stiffeners supported on
   a continuous flat rigid surface
   7.1 General
   7.2 Calculation of the minimum skin thickness
   7.3 Calculation of the horizontal stiffeners
8 Tanks with cross-ribbed horizontal and vertical stiffeners
   supported on a continuous rigid surface
   8.1 Calculation of the minimum skin thickness, base
        thickness and properties of horizontal stiffeners
   8.2 Calculation of the properties of vertical stiffeners
9 Rectangular tanks with U-frame
   9.1 General
   9.2 Calculation of the skin thickness of the side walls
   9.3 Determination of the tank base
   9.4 Calculation of the U-frame stiffening
10 Determination of the tank cover
   10.1 General
   10.2 Freely supported tank cover
   10.3 Fixed tank cover
   10.4 Stiffened tank cover
Annex A (informative) Construction details for rectangular
        tanks
Annex B (informative) Special cases
Annex C (informative) A-deviations
Bibliography

This standard specifies the design and calculation for single sking rectangular tanks, fabricated from the following thermoplastics: Polyethylene (PE), Polypropylene (PP), Poly (vinyl chloride) (PVC), Poly (vinylidene fluoride) (PVDF). The tanks may be strengthened on the outside by means of ribs or frames made of the same or other materials. This standard is only applicable to tanks which are not intended to withstand internal pressure or vaccuum, other than that which may occur during the transfer of fluids (including gases) in their normal operation.