European Standard – EN 13480-3:2012 Issue 1

Formula

The internal pressures are calculated by using the following formula:

D0/Di ≤ 1.7:

P = (2 · (eord - c1) · f · z) / (Do - (eord - c1))

D0/Di > 1.7:

P = (2 · (eord - c1) · f · z) · (D0 - (eord - c1)) / ((eord - c1)2 + (Do - (eord - c1))2)


Symbol / Description
P Internal pressure (MPa) (*10 => bar)
eord Ordered wall thickness (mm)
c1 Manufacturing tolerance, absolute value (mm)
Do Nominal outside diameter (mm)
Di Nominal inside diameter (mm) (Di = Do-2 · eord)
z Welding factor, 1.0 for seamless tubes
f Maximal zulässige Belastung (MPa), siehe unten
At Min. ductility, transverse (%)

Austenitic steels

At >= 35%
f = Rp1.0t/1.5 (or min. (Rp1.0t/1.2;Rmt/3), id Rmt is available)* (t = here at temp.)

30% <= At < 35%
f = min (Rp1,0 t/1,5 oder Rm/2,4)*

* The programme always calculates with Rp 1.0t/1.5 for austenitic grades, but if Rmt or Rm are known for the specific grade and size, and at temperatures for Rmt, this may give a more favourable result in case of At > 35% or > 30% as above.

Austenitic steels with At < 30% and steels other than austenitic (here used for the austenitic-ferritic steels, i. e. duplex stainless steels).

f = min. ((ReHt/1,5 oder Rpo.2t/1,5;Rm/2,4)

Attention: Allowed maximum wall thickness
Austenitic corrosion resisting steels 60 mm
Austenitic - ferritic steels 30 mm

Attention: The pressures on these pages are given only as guidance. Dimensioning of piping systems also depends on other factors like external forces, thermal stresses, dead weight etc. Furthermore the design must be made according to regulations from local authorities and approved accordingly.

Dehngrenze Rp1,0 (MPa) für austenitische Stahlgüten (EN 10216-5:2004)
En No.
20°
C
50°
C
100°
C
150°
C
200°
C
250°
C
300°
C
350°
C
400°
C
At%
1.4306 215 200 180 160 145 135 127 121 116 35
1.4435 225 217 200 180 165 153 145 139 135 30
1.4404 225 217 200 180 165 153 145 139 135 30
1.4541 235 222 208 195 185 175 167 161 156 30
1.4541 215 201 181 162 147 137 127 121 116 30
1.4550 240 232 210 195 185 175 167 161 156 30
1.4571 245 232 218 206 196 186 175 169 164 30
1.4571 225 217 199 181 167 157 145 139 135 30
1.4539 250 244 235 220 205 190 175 165 155 30
1.4563 245 240 220 205 190 185 180 175 165 35
1.4335 210 200 180 170 160 150 140 135 130 (40)
1.4466 295 262 225 205 190 180 170 165 - 30
1.4547 340 306 270 245 225 212 200 195 190 30
1.4558 210 198 185 175 170 165 160 155 150 30
Proof strength Rp0.2 (MPa) for austenitic - ferritic grades (EN 10216-5:2004)
En No.:
20°
C
50°
C
100°
C
150°
C
200°
C
250°
C
At%
RM
1.4462 450 415 360 335 310 395 22 640
1.4362 400 370 330 310 290 280 25 600
1.4410 550 530 480 445 420 405 20 800
1.4424 4801) 430 370 350 330 325 30 700

(1 MPa = 10 bar)
* SS-EN 10216-5:2004/AC:2008 (E)

1) Wall thickness e below 4 mm (e > 4 mm 450 MPa)

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