Fatigue analysis acc. to EN 12952-3 and TRD 301 App.1
for cylindrical components with opening
Component and operating data:
Value
Unit
Outside diameter of the vessel shell
d
os
mm
Wall thickness of the vessel shell
e
ms
mm
Outside diameter of the nozzle
d
ob
mm
Wall thickness of the nozzle
e
mb
mm
Stress concentration factor
α
m
default value
= 1.0
- 10%
+ 10%
+ 60%
= 2.6
= 2.9
= 3.2
= 3.5
= 5.0
Surface roughness
R
z
μm
Welding class
not welded
class K1
class K2
class K3
Type of the medium
water
steam
Maximum operating pressure
p
0
bar
Material properties:
Value
Unit
Material group
ferrit
austenit
Elastic modulus
E
N/mm²
Poisson's ratio
ν
Differential thermal expansion coefficient
β
L diff
10
-6
1/K
Density at 20°C
ρ
20
kg/m³
Heat conductivity
λ
W/m/K
Differential heat capacity
c
p diff
J/kg/K
or
Thermal diffusivity
D
th
mm²/s
Ultimate tensile strength
R
m 20
N/mm²
Yield strength
R
e
N/mm²
Cyclic loadings data:
Event
p
min
bar
p
max
bar
t
min
°C
t
max
°C
v
t1
°C/min
v
t2
°C/min
N
req
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