Hydrocarbon Processing - November 2022 - 56

Heat Transfer
Design conditions. The design and
operating pressures and temperatures
comprise:
* Design pressure: 0.625 MPa (g)
* Design temperature: 690°C
* Operating pressure: 0.19 MPa (g)
* Operating temperature
at inlet: 130°C
* Operating temperature
at outlet: 649°C.
Materials of construction comprise:
* Heater shell: SA312-TP304H
* Nozzle: SA-403-TP304H (conical
fitting)/SA-312-TP304H (pipe).
External loads. Originally, the standard
piping loads that are applicable for vessels
were provided (TABLE 1) to the electric
heater supplier as the imposed external
loads on the heater nozzles. Since this
electric heater is not a standard pressure
vessel, is small in size and designed for
very high temperature, the heater shell,
nozzle and shell-to-nozzle junction failed
to withstand these standard piping loads.
Piping stress engineers considered heater
shell and nozzle flexibilities in their stress
analysis and proposed reduced loads, as
indicated in TABLE 2.
FIG. 2. Load Case 1 (Sustained):
Primary membrane stresses at the
inlet and outlet for SCH 40S.
FIG. 4. Load Case 1 (Occasional):
Primary membrane stresses at the
inlet and outlet for SCH 40S.
FIG. 6. Load Case 1 (Occasional): Fatigue
stresses at the inlet and outlet for SCH 40S.
FIG. 3. Load Case 1 (Thermal):
Primary membrane stresses at the
inlet and outlet for SCH 40S.
FIG. 5. Load Case 1 (Occasional):
Primary + secondary + bend stresses
at the inlet and outlet for SCH 40S.
TABLE 3. Load Case 1 and Load Case 2
Load Case 1
Nozzles Type of loading
Fx
Inlet
(3 in.)
Sustained loads
Operating loads
Occasional loads
Outlet
(6 in.)
Sustained loads
Operating loads
Occasional loads
Nozzles Type of loading
Fx
Inlet
(3 in.)
Sustained loads
Operating loads
Occasional loads
Outlet
(6 in.)
Sustained loads
Operating loads
Occasional loads
-24
-614
Fx
-24
-613
Fx
Force (N)
Fy
-368
-2,283
Fz
-1
720
Fz
Mx
-250
Moment (N-m)
My
16
-2,231
-1,324 -2,499 1,090 -2,477
Fy
Mx
-27
1,187
-2,071
-8,681
Load Case 2
Force (N)
Fy
-368
-2,184
-1,325 -2,400
Fy
-27
1,103
56 NOVEMBER 2022 | HydrocarbonProcessing.com
-2,071
-8,095
Fz
-1
355
725
Fz
-69
4,574
1,600 -10,800 5,100
Mx
-250
Moment (N-m)
My
16
-2,204
-2,450
Mx
-87
1,322
2,600
262
700
My
-4
221
600
Mz
30
-1,728
-1,900
Mz
-59
2,285
3,500
FIG. 9. Load Case 1 (Occasional):
Primary membrane stresses at the
inlet and outlet for SCH 80S.
-69
4,906
1,684 -11,386 5,432
-87
1,451
2,729
-385
-823
My
-4
238
617
Mz
30
-1,830
-2,002
Mz
-59
2,463
3,678
FIG. 8. Load Case 1 (Thermal):
Primary membrane stresses at the
inlet and outlet for SCH 80S.
FIG. 7. Load Case 1 (Sustained):
Primary membrane stresses at the
inlet and outlet for SCH 80S.

https://www.HydrocarbonProcessing.com

Hydrocarbon Processing - November 2022

Table of Contents for the Digital Edition of Hydrocarbon Processing - November 2022

Industry Perspectives
Editorial Comment
Construction
Innovations
Digital Technologies
Optimization of ethylene in the processing of hydrocarbons
Shift focus to more open control technology
Integrated remote operations drive collaboration and autonomy
Reliability analysis of analyzers bridges the gap between assessing and addressing risk
Implement advanced level control techniques to improve crude distillation unit stabilizer performance
Leading capital projects in a VUCA environment
Trip your turbine troubles: Optimize the reliability of steam-driven turbines
Development of novel epoxy closed-cell foam for personnel and corrosion protection—Part 2
Obsolescence management in a manufacturing unit
Decarbonizing your fired heaters with hydrogen fuel
Mechanical design challenges in high-temperature electric heaters
Why sulfur plants fail: An in-depth study of sulfur recovery unit failures—Part 2
Advertiser Index
Hydrocarbon Processing - November 2022 - 1
Hydrocarbon Processing - November 2022 - 2
Hydrocarbon Processing - November 2022 - 3
Hydrocarbon Processing - November 2022 - Industry Perspectives
Hydrocarbon Processing - November 2022 - 5
Hydrocarbon Processing - November 2022 - 6
Hydrocarbon Processing - November 2022 - Editorial Comment
Hydrocarbon Processing - November 2022 - 8
Hydrocarbon Processing - November 2022 - 9
Hydrocarbon Processing - November 2022 - Construction
Hydrocarbon Processing - November 2022 - 11
Hydrocarbon Processing - November 2022 - Innovations
Hydrocarbon Processing - November 2022 - 11B
Hydrocarbon Processing - November 2022 - 12
Hydrocarbon Processing - November 2022 - Digital Technologies
Hydrocarbon Processing - November 2022 - 14
Hydrocarbon Processing - November 2022 - 15
Hydrocarbon Processing - November 2022 - 16
Hydrocarbon Processing - November 2022 - Optimization of ethylene in the processing of hydrocarbons
Hydrocarbon Processing - November 2022 - 18
Hydrocarbon Processing - November 2022 - 19
Hydrocarbon Processing - November 2022 - 20
Hydrocarbon Processing - November 2022 - Shift focus to more open control technology
Hydrocarbon Processing - November 2022 - 22
Hydrocarbon Processing - November 2022 - 23
Hydrocarbon Processing - November 2022 - 24
Hydrocarbon Processing - November 2022 - Integrated remote operations drive collaboration and autonomy
Hydrocarbon Processing - November 2022 - 26
Hydrocarbon Processing - November 2022 - 27
Hydrocarbon Processing - November 2022 - 28
Hydrocarbon Processing - November 2022 - 29
Hydrocarbon Processing - November 2022 - 30
Hydrocarbon Processing - November 2022 - Reliability analysis of analyzers bridges the gap between assessing and addressing risk
Hydrocarbon Processing - November 2022 - 32
Hydrocarbon Processing - November 2022 - 33
Hydrocarbon Processing - November 2022 - Implement advanced level control techniques to improve crude distillation unit stabilizer performance
Hydrocarbon Processing - November 2022 - 35
Hydrocarbon Processing - November 2022 - 36
Hydrocarbon Processing - November 2022 - Leading capital projects in a VUCA environment
Hydrocarbon Processing - November 2022 - 38
Hydrocarbon Processing - November 2022 - Trip your turbine troubles: Optimize the reliability of steam-driven turbines
Hydrocarbon Processing - November 2022 - 40
Hydrocarbon Processing - November 2022 - 41
Hydrocarbon Processing - November 2022 - 42
Hydrocarbon Processing - November 2022 - 43
Hydrocarbon Processing - November 2022 - 44
Hydrocarbon Processing - November 2022 - 45
Hydrocarbon Processing - November 2022 - 46
Hydrocarbon Processing - November 2022 - Development of novel epoxy closed-cell foam for personnel and corrosion protection—Part 2
Hydrocarbon Processing - November 2022 - 48
Hydrocarbon Processing - November 2022 - 49
Hydrocarbon Processing - November 2022 - 50
Hydrocarbon Processing - November 2022 - Obsolescence management in a manufacturing unit
Hydrocarbon Processing - November 2022 - 50B
Hydrocarbon Processing - November 2022 - Decarbonizing your fired heaters with hydrogen fuel
Hydrocarbon Processing - November 2022 - 52
Hydrocarbon Processing - November 2022 - 53
Hydrocarbon Processing - November 2022 - 54
Hydrocarbon Processing - November 2022 - Mechanical design challenges in high-temperature electric heaters
Hydrocarbon Processing - November 2022 - 56
Hydrocarbon Processing - November 2022 - 57
Hydrocarbon Processing - November 2022 - 58
Hydrocarbon Processing - November 2022 - 59
Hydrocarbon Processing - November 2022 - 60
Hydrocarbon Processing - November 2022 - Why sulfur plants fail: An in-depth study of sulfur recovery unit failures—Part 2
Hydrocarbon Processing - November 2022 - 62
Hydrocarbon Processing - November 2022 - 63
Hydrocarbon Processing - November 2022 - 64
Hydrocarbon Processing - November 2022 - 65
Hydrocarbon Processing - November 2022 - Advertiser Index
Hydrocarbon Processing - November 2022 - 67
Hydrocarbon Processing - November 2022 - 68
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