You can contact these manufacturer in Italy, they are proven on HP vessel and Shell & Tube heat exchangers:
Officine Luigi Resta
Alfa Laval OLMI - Suisio (Bg)
Villa & Bonaldi - Ricengo (Cr)
ATB Riva Calzoni Roncadelle (Bs)
Belleli - Mantova
You can find all addresses on the web
regards
Dear Mali325,
I think no difference about the two standards.
One DIN EN 10089 (DIN = Deutsches Institut fur Normung) is in german language and BS EN 10089 (BS = British Standard)is in english language, but both are related to the same European standard.
ciao