Hydrocarbon Processing - November 2022 - 59

Heat Transfer
ed to repeat the analysis for higher shell
thickness (SCH 80S) to check whether
the increase in thickness coulc bring the
induced stresses within allowable limits.
For Load Case 1 for the SCH 80S
thick shell: The stress analysis was carried
out considering allowable stresses at
a design temperature of 690°C for both
the shell and inlet and outlet nozzles.
* The primary membrane stresses
for Sustained loads are tabulated in
TABLE 7, and the calculated stresses
are within the allowable limit.
* The primary membrane stresses
for Thermal loads are tabulated
in TABLE 8.
° The primary membrane stresses
at inlet the shell and inlet nozzle
are ~234% and ~239% of
allowable limits, respectievly.
° The primary membrane
stresses at the outlet shell
and outlet nozzle are within
allowable limits.
* The primary membrane stresses,
secondary membrane and bending
stresses, and fatigue stresses for
Occasional load are tabulated
in TABLE 9.
° The primary membrane stresses
at the inlet shell and inlet
nozzle are ~282% and ~286% of
allowable limits, respectively.
° The primary membrane
stresses at the outlet shell
and outlet nozzle are within
allowable limits.
° The secondary membrane and
bending stresses at the inlet and
outlet shells and nozzles are
within allowable limits.
° The fatigue stresses at the
inlet and outlet shells and inlet
and outlet nozzles are within
allowable limits.
The shell and nozzle failed with the
SCH 80S thickness, as well. Any further
increase in shell thickness to bring the
induced stress within allowable limits
could not be considred since the heater
supplier informed that any increase in
pipe schedule above 80S will result in
the shell's inside diameter becoming
smaller than the bundle diameter.
For Load Case 2 for the SCH 40S
thick shell: The stress analysis was carried
out considering the allowable stress
at an operating temperature of 130°C at
the inlet and 649°C at the outlet for both
shell and nozzles.
* The primary membrane stresses
for Sustained loads are tabulated
in TABLE 10. The calculated stresses
are within the allowable limits.
* The primary membrane stresses
for Thermal loads are tabulated in
TABLE 11. The calculated stresses at
the inlet and outlet shells, and the
inlet and outlet nozzles are within
the allowable limits.
FIG. 16. Load Case 2 (Occasional): Fatigue
stresses at the inlet and outlet for SCH 40S.
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Hydrocarbon Processing
Hydrocarbon Processing | NOVEMBER 2022 59
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Hydrocarbon Processing - November 2022

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