Calculation of Heater Tube Thickness
according to API standard 530, 7
th
edition
Attention!
This calculation is only a simplified estimation, and does not replace a detailed design calculation.
Input data
ASTM steel material
<select material>
A161
A192
A53 Grade B seamless
A106 Grade B
A210 Grade A-1
A161 T1
A209 T1
A335 P1
A213 T11
A335 P11
A200 T11
A213 T22
A335 P22
A200 T22
A213 T21
A335 P21
A200 T21
A213 T5
A335 P5
A200 T5
A213 T5b
A335 P5b
A213 T7
A335 P7
A200 T7
A213 T9
A335 P9
A200 T9
A213 T91
A335 P91
A200 T91
A213 Type 304L
A271 Type 304L
A312 Type 304L
A376 Type 304L
A213 Type 304
A271 Type 304
A312 Type 304
A376 Type 304
A213 Type 304H
A271 Type 304H
A312 Type 304H
A376 Type 304H
A213 Type 316L
A271 Type 316L
A312 Type 316L
A376 Type 316L
A213 Type 316
A271 Type 316
A312 Type 316
A376 Type 316
A213 Type 316H
A271 Type 316H
A312 Type 316H
A376 Type 316H
A213 Type 317L
A312 Type 317L
A213 Type 321
A271 Type 321
A312 Type 321
A376 Type 321
A213 Type 321H
A271 Type 321H
A312 Type 321H
A376 Type 321H
A213 Type 347
A271 Type 347
A312 Type 347
A376 Type 347
A213 Type 347H
A271 Type 347H
A312 Type 347H
A376 Type 347H
B407 UNS N08800
B407 UNS N08810
B407 UNS N08811
A608 Grade HK-40
ferritic steel
austenitic steel
User-defined allowble stress
S
1)
MPa
Minimum yield strength
S
Y
at 20 °C
MPa
Minimum tensile strength
S
T
at 20 °C
MPa
Tube outside diameter
D
o
mm
or
tube inside diameter
D
i
mm
Wall thickness
δ
mm
Corrosion allowance
δ
CA
mm
Design life
t
DL
h
Design pressure
p
bar (g)
Temperature at start of run
T
sor
°C
Temperature at end of run
T
eor
°C
1) –
the elastic allowable stress is two-thirds of the yield strength at temperature for ferritic steels and 90 % of the yield strength at temperature for austenitic steels (API-530 § 6.2); the rupture allowable stress is 100 % of the minimum rupture strength for a specified design life (API-530 § 6.3)
Calculate
Results
Equivalent temperature
T
eq
°C
Allowable stress
S
MPa
Corrosion fraction
f
corr
Allowable working pressure
p
max
bar (g)
Required testing pressure
p
T
bar (g)
(acc. to API-560)
Allowable testing pressure
p
T all
bar (g)
Required wall thickness
δ
min
mm
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