T3D Re: underwater housings

[john bercovitz <bercov@xxxxxxxxxxx>]

> Schedule 40 DWV (drain-waste-vent) is commonly available and
> usually rated at well over 200 psi (plenty for the 4 atmospheres
> you can dive to on air).

I agree that this sounds plenty safe but just want to note that
because of stability questions, the internal pressure rating is 
greater than the external pressure rating.  (See Roark's)  So I
wouldn't push this line of reasoning too far without calculating 
or doing a "dry" run.  In this particular case, though, I would 
chance it because you have so much overkill.

John B


------------------------------