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ERECTION OF A STAINLESS-STEEL TANK FOR STORING A PHOSPHORIC ACID

INTRODUCTION

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DESCRIPTION OF THE STRUCTURE

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 A storage tank for 93 % phosphoric acid was built in Luka Koper from 7 mm thick ground hot-rolled plates of

316L stainless steel. The capacity of the storage tank is of the 750 m3, diameter of 11 m and the height of 8,2

m. The shell plates were welded manually using the shielded metal-arc and gas-metal-arc processes. Before

the erection, welding procedure tests according to EN 288-3 were carried out. During the construction several

non-destructive examination methods were used, such as radiographic testing and visual and liquid penetrant

examination. After the entire tank and roof structure were completed, a hydrostatic leak test was carried out.

The surfaces of all the welds on the internal surface of the vessel were ground and the roughness was checkedon site. The surfaces of the base material and the ground welds were passivated and tested for resistance to

corrosion with electrochemical measurements.

Key words: stainless steel, phosphoric acid, cylindrical storage tank, welding 

Volumen rezervoara je 750 m3, promjer 11 m i visina plašta 8,2 m. Za zavarivanje plašta rezervoara je korišten

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 je izveden hidrotest rezervoara. Sve površine zavara na unutarnjoj površini rezervoara su obrušene i polirane,

a potom je provjerena hrapavost. Površine osnovnog materijala i obrušeni zavari su pasivizirani te ispitani na

 

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STORAGE TANK CALCULATION

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 g  = 17,8

3,

2),

 g   3,

 D 

 H  p

 H m 

G = 1,78

3,

t  

CA  T   S 

d  = 137

 2,

S 

t   2,

   3.

.

i

d 

d 

 H Gt CA

S 

(1)

.

i

t 

t 

 H t 

S 

(2)

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3.

8/9/2019 Erection of a Stainless-steel Tank for Storing a Phosphoric Acid

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METALURGIJA 46 (2007) 3, 173-178  

 H  p

 H 

i  -

t 

d 

t d  

t t 

t t  

t   

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THE BASE MATERIAL

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2O

3 

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8/9/2019 Erection of a Stainless-steel Tank for Storing a Phosphoric Acid

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METALURGIJA 46 (2007) 3, 173-178

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WELDED JOINTS

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METALURGIJA 46 (2007) 3, 173-178 177

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ASSEMBLY OF THE STORAGE TANK 

 

 

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REFERENCES

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   RMZ-mater. geoenviron. 

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- 1328.

 

 

 

 

 

 

 

 

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CONCLUSION

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