Standards Development

Scope

(1) EN 1991-4 provides rules for calculating actions for the structural design of silos and tanks.

NOTE 1 Silos are used for the storage of particulate solids. Tanks are used for the storage of liquids.

NOTE 2 For limitations on rules for silos given in this document, see 1.3. 

NOTE 3 For limitations on rules for tanks given in this document, see 1.4.

(2) EN 1991-4 includes some provisions for actions on silo and tank structures that are not only associated with the stored particulate solids or liquids (e.g. the effects of thermal differentials) but substantially affected by them.

NOTE Liquid loads on tanks are very precisely defined. Many loads on silos are not known with great precision. This document provides guidance for many practical situations for which very limited certain knowledge is available, and the information is derived from the limited experimental and analytical information available, coupled with conclusions drawn from failure investigations. The information is not based on a sound statistical treatment of experimental data.

(3) EN 1991-4 is intended for use with concrete, steel, aluminium, timber and FRP storage structures.

NOTE FRP is the standard acronym for fibre reinforced polymer materials.

(4) EN 1991-4 is also applicable for the structural assessment of existing silos and tanks, unless otherwise specified by the relevant authority or, if not specified, agreed between the relevant parties for the specific project.

NOTE 1 Changes in filling or discharge arrangements, changes in the wall friction of inner surfaces, or in the use of the silo, including storage of different particulate solids, can be reasons for assessing existing silos.

NOTE 2 Differentiation of the liquid stored can be a reason for assessing existing tanks.

Purpose

This amendment intends to ensure the consistency between the different Eurocodes and within EN 1991 (all parts), as well as to introduce editorial and technical corrections identified during the FV stage of EN 1991-4.