Before revision: A minimum pressure of 4-5 psig at the top of a closed hydronic system is suggested.ACHR News | Pressurization Of Closed Hydronic Systems In Europe the design and the construction of expansion tanks are ruled by EN 13831 according to Pressure Equipment Directive (PED) 97/23/EC.
After revision: A minimum pressure of at the top of a closed hydronic system is suggested.ACHR News | Pressurization Of Closed Hydronic Systems In Europe the design and the construction of expansion tanks are ruled by EN 13831 according to Pressure Equipment Directive (PED) 97/23/EC.