The loads on the structure are classified as: primary load, secondary load and occasional Load. The primary loads are: self weight, equipment loads, weight of contents, weight of Insulation, weight of refractory and imposed loads (live loads).
The secondary loads are:
Thermal loads, loads due to relative settlement of columns and equipment thermal movement Loads. The occasional loads are: Wind load, seismic load (earth-quake load), fire load, flood Load, tsunami load, snow load and ice load.