PSI - Issue 13

Aleksandar Milovanović et al. / Procedia Structural Integrity 13 (2018) 994–999 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

995

2

173

203

197

Figure 1: a) north side, inside view; b) south side, inside view

2. Spherical tank stresses according to EN 13445-3: 2014

The ammonia spherical tank is made of A36.52 [1], characterized by the following mechanical properties and chemical composition:

Table 1. Chemical composition in %.

Designation

C%

Mn%

Si

P max

S max

Al total

N

Cr

Cu

Mo

Nb Ni Ti max

V

≤0.157

≥0.015

A36.52

1.39

0.3 0.013 0.021

-

0.08

-

0.02

-

-

-

0.08

Table 2. Mechanical properties.

Elongation  [%]

Thickness [mm]

Rp 0,2t [MPa]

Rm [MPa]

Toughness KV (J) min

Designation

Standard

-20

0 °

+20 °

°

≤ 50

A36.52

AFNOR

360

520

23

47

-

-

Determination of the permitted stress for material A36.52: = (

1 ,8 75 ; 0,2 1,5 ) ,

(1)

= 240 . = 360 .

(2)

Determination of the permitted stress for material A36.52 for local conditions: = 1,5 ∙ , (4) Determination of the required wall thickness for a spherical shell exposed to the internal pressure according to EN 13445:3-2014 [2]: = ( 1 , 2 ), (5) 1 = ∙ 4∙ ∙ + + + = 26,16 , (6) 2 = ∙ 4∙ ∙ − + + = 26,15 , (7) = 26,16 . (8) (3)