**
Request for Question Clarification by
pafalafa-ga**
on
26 Nov 2005 06:54 PST
Apparently, there's no straightforward formula for this
tricker-than-you'd-expect math problem.
There are some sites you can visit which provide answers for a range
of diameters, however.
Try this one:
http://www.stetson.edu/~efriedma/cirincir/
Circles in Circles
For the case you mentioned, 6" conduits inside a 26" pipe, the ratio
of the diameters is:
26/6 = 4.333
which should allow you to get 14 conduits in the pipe.
This is because the value shown for 14 circles is r = 4.328 (smaller
than 4.333), while the next value up -- at 4.521 -- is a bit too
large.
I'm assuming, of course, that the 26" is the *inside* dimension of the pipe.
The above link should give you some good rules of thumb for at least
20 conduits in a pipe, with the smaller diameter being about one-fifth
the size of the larger pipe.
Larger ratios than 1:5, however, and you're on your own!
Does that help?
pafalafa-ga