Are there any polymer fastenings standards available? For steel you can use ASTM A193 or 194 or A307 but I can't find any equivalent for bolts and nuts made from polymers such as nylon etc.
Try this book, CO2 Corrosion Control in Oil and Gas Production - Design Considerations (EFC 23) available from Maney publishing.
http://www.maney.co.uk
It goes through the thought process required when choosing materials for CO2 (sweet) service. Often carbon steel and corrosion inhibition can...
I've not got a lot of experience with Sulfinol but other amines (MEA, MDEA). I'd definitely recommend stainless for the top section, bottom section and probably pipework as well.
