Method of proceeding of the Spiral Pipe

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Method of proceeding when calculating the durability of multi-elements steel  structure type multiplate MP150:

- define function of structure.

- define of the required durability of the structure

- define of conditions of the environmental aggressiveness(water, backfill,  air) - choice the governing corrosion model.

- specifying of the plate thickness with regards to static calculations(acc.  to Sundquist - Petterson method)

- specifying of corrosion protection(thickness of zinc coating, paint  coating, paved bottoms, etc)

- define of protection layers in upper and lower sphere of the structure with  allowance the corrosion progress in surrounding environments with described  aggressiveness.

- calculation of durability period of the structure in upper and lower  part.

- comparison of the structure durability in the critical parts with the  required value.

- decision about acceptance of the structure or about rejection and change of  parameters of corrosion protection.