Piping Systems Manual is now available from Amazon. This is a practical reference manual for engineers and designers, but others (like inspectors) will find valuable info relating to materials of construction, fittings, valves, and lots of technical data.
So, you are an engineer, and do home inspections. If you were in Kansas, you would be exempt from any home inspection laws, rules, regulations, educational requirements, etc. Are you civil, mechanical, electrical?