Dinn
Chemical
- Apr 13, 2007
- 1
Hi Guys,
I want to thank you all for the knowledge I have gained so far from viewing the forum over the past few months.
My current challenge relates to PSV Sizing on a Crude oil Heater (Shell and Tube Exchanger with two shell unit in series). Both PSVs on the Shell side and the tube side are to be sized for Fire Case Scenarios.
The following are some of the sizing parameter:
Shell side Fluid: crude Oil
Tube Side Fluid: Glycol and WAter
Design Pressure of shell side: 7 barg
Design Pressure of tube side: 31 barg
Operating Temp of Shell side: Inlet: 20DegC and Outlet: 53DegC
Operating Temp of tube side: Inlet: 74DegC and Outlet: 31DegC
Length (per shell): 9.8m
Diameter (per shell): 1.75
Length (per tube): Assummed at 1m (data is not available)
As I have never carried out a PSV sizing before on a Heat Exchanger How do I determine the wetted Surface area of the Shell side and that of the Tube Side assumming the system is filled with liquid. I initially sized the PSV on the shell side based on wetted surface area of [(Pi x 9.8m x 1.75m x 2) + (Surface Area of 2 Heads assumed 2:1 Ellipsoidal)] but feel something is not right.
I read somewhere that For heat exchangers, one should include the tube-side head area when there is potential for heat gain from the tube-side to boil the shell-side fluid, and vice-versa.
Does this mean that I should add the surface area of the tube side to the shell side to work out the PSV on both sides. To be honest I dont really understand this and need further clarification.
Please guys help
Dinn
I want to thank you all for the knowledge I have gained so far from viewing the forum over the past few months.
My current challenge relates to PSV Sizing on a Crude oil Heater (Shell and Tube Exchanger with two shell unit in series). Both PSVs on the Shell side and the tube side are to be sized for Fire Case Scenarios.
The following are some of the sizing parameter:
Shell side Fluid: crude Oil
Tube Side Fluid: Glycol and WAter
Design Pressure of shell side: 7 barg
Design Pressure of tube side: 31 barg
Operating Temp of Shell side: Inlet: 20DegC and Outlet: 53DegC
Operating Temp of tube side: Inlet: 74DegC and Outlet: 31DegC
Length (per shell): 9.8m
Diameter (per shell): 1.75
Length (per tube): Assummed at 1m (data is not available)
As I have never carried out a PSV sizing before on a Heat Exchanger How do I determine the wetted Surface area of the Shell side and that of the Tube Side assumming the system is filled with liquid. I initially sized the PSV on the shell side based on wetted surface area of [(Pi x 9.8m x 1.75m x 2) + (Surface Area of 2 Heads assumed 2:1 Ellipsoidal)] but feel something is not right.
I read somewhere that For heat exchangers, one should include the tube-side head area when there is potential for heat gain from the tube-side to boil the shell-side fluid, and vice-versa.
Does this mean that I should add the surface area of the tube side to the shell side to work out the PSV on both sides. To be honest I dont really understand this and need further clarification.
Please guys help
Dinn
