For more information reference is made to the relevant sections in the standard and the VVD Code Assistant (technical help section 7.1 External Design Loads).

The factor 0,9 is applied to the internal maximum allowable pressure PS because the internal operating pressure is normally 10% below PS due to the pressure limiting device. The seismic loads allowable stress is however now taken as ftest (less conservative) while previously it was 1.2 * f in VVD, the allowable stress for anchor bolt are however still multiplied by a maximum of 1.2 for exceptional load cases. The factor 0,6 is in accordance with EN and DIN 1055-4, Table 1 for duration times < 3 days (0,5 1,1 = 0,55 0,6. L = Live Loads, F = Loads from External Piping, W = Wind, E = Earthquake, Dmax = Maximum dead loads, Dcorr = Corroded dead loads, Dmin = Manimum dead loads The wind load has become more conservative as the wind load for operating conditions with the new rules is multiplied by 1.1 instead of 1.0 previously in VVD (0.6 for hydrotest case while 0.5 previously in VVD). The user may however delete or add additional load cases, and change the load weighing factors as applicable. The load cases and load weighing factors as given in table below are now the default values suggested by the external loads module for vertical vessels.

The new sections of the standard gives requirements for dead loads, live loads, wind loads, seismic loads, loads from external piping at nozzles, load cases, load weighing factors, safety factor for anchor bolts, recommended minimum torque for anchor bolts, considerations for foundation loads, and detailed design of skirt base including base ring, gussets, chairs and top ring.ĮN13445:3 Table 22-1: New Load Combinations for columns.

This new section provides all necessary design rules to perform a complete analysis of a tall vertical vessels/columns, with the definition of columns as vessels with a total height h 6,5, and vessels with h > 10 m and with a ratio h/d > 4. New section EN13445-3:2014 Section 22, Static Analysis of Tall Vertical Vessels. This version is also in compliance with:īelow is a brief summary of additions and enhancements:Īdded new commonly used materials to the VVD material library. Read Me File Version 15.0 (2015) Updates to latest code amendment Version 15.0 includes a number of improvements and additions. Ohmtech AS, Visual Vessel Design (VVD) version 2015

Visual vessel design