I've got a water tight (IP-68) plastic communications device with an internal volume of about 50 in^3. It is vented through a hydrophobic membrane for two reasons. The first is to prevent pressure build up due to changes in temperature. The second is to allow humidity fluctuations to happen...
I'm beginning a design of a large (20' x 10' x 5') frame composed of welded box tubing. I'm wondering if anyone can recommend a good reference for design practices for this type of project. I'm looking for information on structural analysis of the frame members and more specifically the welded...