Thank you for the recomendation. I have refined the mesh and then I get this message "A software execution error occurred inside the mesher.  The process suffered an unhandled exception or ran out of usable memory."

To make you easier to visualize the problem,here i give you the dimension
outer diameter   : 0.375"
thickness          : 0.00625"

length               : 1550ft

I model the tube in shell mode