Line Heater Sizing
Line Heater Sizing
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I am newbie in sizing Line Heater. I went through this thread798-204110: Line Heater Siizng thread which is closed now. I hope there are many of you who size the line heaters using Excel spread sheet or other software's on a regular basis. Any help is greatly appreciated. If anyone has sized it using Promax software, please let me know.
I have the following information:
Gas Flow rate: 6MMSCFD
Oil Flow rate: 120 bbl/d
Preheat Coil Inlet & Outlet Temp.: 60 & 156 deg F
Reheat Coil Inlet & Outlet Temp.: 56 & 80 deg F
Bath Temp.: 185 Deg F
Operating Temp. Preheat: 2500 Psig
Operating Temp. Reheat: 250 Psig
Bath Composition: 50/50 TEG/Water
I appreciate any kind of help...
I am newbie in sizing Line Heater. I went through this thread798-204110: Line Heater Siizng thread which is closed now. I hope there are many of you who size the line heaters using Excel spread sheet or other software's on a regular basis. Any help is greatly appreciated. If anyone has sized it using Promax software, please let me know.
I have the following information:
Gas Flow rate: 6MMSCFD
Oil Flow rate: 120 bbl/d
Preheat Coil Inlet & Outlet Temp.: 60 & 156 deg F
Reheat Coil Inlet & Outlet Temp.: 56 & 80 deg F
Bath Temp.: 185 Deg F
Operating Temp. Preheat: 2500 Psig
Operating Temp. Reheat: 250 Psig
Bath Composition: 50/50 TEG/Water
I appreciate any kind of help...





RE: Line Heater Sizing
RE: Line Heater Sizing
Here are Oil & Gas Properties:
Oil:
Specific Gravity = 0.8
Molecular Weight = 170lb/lbmol
Gas:
Components Mol%
Methane = 85
Ethane = 8
Propane = 5
i-Butane = 1
n-Butane =1
I don't know how to incorporate Preheat and Reheat coils together in a single heat exchanger along with Fire Tube.
This is how I have been trying in Promax:
-I put a mixer to mix Gas & Oil and connected the Outlet to the Tube side inlet of first Heat Exchanger
-I connected the Outlet of tube side to a J-T Valve (to reduce pressure)
-Then I connected the Outlet of Shell side (TEG/WATER) to the Inlet of second Heat Exchanger and Outlet of J-T Valve to the Inlet of Tube side.
-So I get my Heat Duty required for both Heat Exchangers.
But I don't know how to decide on No. of PASSES, Required Coil Length, Area Required for both Coils, etc. because I have on them on two separate Heat Exchangers.
Also, how do I size Fire Tube? Please advise me....
Thank you in advance.
RE: Line Heater Sizing
RE: Line Heater Sizing
I do the same way how you suggested. Now my concern is Coil sizing. I really need to know this as Line Heater sizing is going to be part of my job. I need to survive!!!
Thanks again.
RE: Line Heater Sizing
the duty is 1.25 MMBTU/hr
The preheat requires 110 ft^2 or 10 17.5 ft passes of 2" sch 80.
The post requires 13 ft^2 or 1 pass of 17.5 ft of 3" sch 80 pipe.
The fire tube is a single 16" U tube of 17' by 2.
RE: Line Heater Sizing
How did you do this? Did you use any software or spread sheet calculations?
I am using Promax software and I can get the duty but I can't get the Preheat and Reheat coil length, area, passes and size. Also the firetube length. Can you please please let me know?
Thank you in advance....
RE: Line Heater Sizing
Here is the screen page from a Winsim where I solved the heater flas. I just typed in the proceedure for the water bath heater
RE: Line Heater Sizing