Seawater crude oil cooler
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It is necessary to design a cooler for seawater-based crude oil. It has been decided that seawater will flow through the tube side while the crude oil will flow through the shell side; the pressure on the shell side is 3.75, while the pressure on the tube side is 0.75. A U-tube type heat exchanger is planned to be used. At present, it is not clear what materials should be chosen, nor are decisions yet made regarding the heat exchange tubes, the shell, or the tube sheets. I hope everyone can offer some suggestions
Can TA2 be used for the end caps and tube sheets of the heat exchange tubes, and Q345R be used for the shell?
What about the process temperature? The contents of chlorides and sulfides in the crude oil must be provided so that everyone can use this information to choose the appropriate option
Since seawater is used for heat exchange, the temperature of the crude oil will not be too high~~~ In this case, the shell should be made of Q245R/Q345R, while the tube sheet should be made of 16MnII; the heat exchange tubes should be made of S31603, with an internal anti-corrosion coating of type 99; the tube box should also be made of S31603, with an internal anti-corrosion coating of type 99~~~
The composition of the crude oil wasn’t specified; it was only taken into account in terms of its corrosiveness and viscosity. The temperature of the crude oil was reduced from 140 to 110, while that of seawater was reduced from 40 to 30
I plan to use Q345R for the shell, while TA2 will be used for the tube side, the head, and the tube sheet of the tube box. Is this acceptable? If TA2 is used, does that mean I don’t need to follow the minimum thickness requirement of 8 mm specified in the design manual for Q345R? My inner diameter is 400
No specific components were mentioned; ordinary corrosion and viscosity are the factors to consider. If TA2 is used, how is the thickness calculated? Is there also a minimum thickness requirement, like in the case of low-alloy steel?
If TA2 is used for the heat exchange tubes, the heat transfer coefficient needs to be recalculated~~~ The thermal conductivity of Ti is relatively low~~~ The tube sheet can be made of titanium-lined composite plates, with TA2 serving as the composite layer; strength considerations need not be taken into account in this case.