design of rectangular pressure vessels

I recently received a pdf file from which contains much of the ASME info as well as others. I'm sure if you ask, they will send you this file. If not let me know.
Hope this helps.

You can find design information for rectangular tanks in the "Pressure Vessel Handbook", by Eugene F. Meggesy, Seventh Edition, Pressure Vessel Handbook Publishing, Inc., last copyrighted 1986. I assume later editions are available. For my edition, see pages 182-190, which give complete design calculation methods with examples. The more you learn, the less you are certain of.

I'll respond to my own message, just found a copy of the same textbook, but an eleventh edition copyrighted 1998. The information on rectangular tanks seems to be identical to the earlier edition. The more you learn, the less you are certain of.