Hi Durcan,
Sorry, I was away for 3 weeks, so did not read your post untill just now. I can arrange a PDF file of some of the Standard's excerpts, but do not know how to send these to you. I don't think I can attach the file to the Forum's post; nor do I want to infringe upon the copyrights of...
I would suggest you follow BS 799 Part 5. Although this Standard is for storage of petroleum fuel oils, your application could be considered 'similar', for the limited aspects of storage in tanks. The Standard gives details of wall/bottom thickness, reinforcement beam requirements, nozzles and...