On 5/13/2012 9:25 AM, Steve B wrote:
....

maybe like 4" outer 2" inner, and half inch tubing. Just have to make a
chart on ID's and OD's and see what looks like the best fit.


Seems to me the starting place would be to decide on necessary flow
rates and then the required velocities to achieve same w/ a given
annulus size and resulting friction losses, etc., etc., etc., ...

Then when have the design reqm'ts the pipe sizes will fall out as what
they must be (or the concept will be shown to be flawed/feasible).

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