"dpb" wrote in message ...
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).


Could also just go to HD and screw around with nipples, etc, for a visual of
what fits, etc.
You definitely don't want an analus that's too tight.....
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EA


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