UNI EN 12573-3 : 2001

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

Defines the design and calculation for single skin rectangular tanks, fabricated from the following thermoplastics: Polyethylene (PE), Polypropylene (PP), Poly (vinyl chloride) (PVC), Poly (vinylidene fluoride) (PVDF).