ASME BPVC.VIII.1-2017
106 See Transactions ASCE, Volume 98 — 1931 “Design of Large Pipe Lines.”
107 This construction has the further advantage of not transmitting discharge‐pipe strains to the valve. In these types
of installation, the back pressure effect will be negligible, and no undue influence upon normal valve operation can
result.
108 A Nonmandatory Appendix Y flange bolted to a rigid foundation may be analyzed as a Class 1 assembly by substituting 2l for l in eq. Y-6.1(12) of Y-6.1.
109 Where the flanges are identical dimensionally and have the same elastic modulus E , but have different allowable
stresses S f , the assembly may be analyzed as a Class 1 assembly, provided the calculated stresses are evaluated
against the lower allowable stress.
110 The symbols for the various stresses in the case of a Class 3 assembly also carry the subscript I or II. For example,
S H I represents the longitudinal hub stress in Flange I of the Class 3 assembly.
111 Manufacturers are cautioned to calculate the minimum ratio based upon mill test values of the tube and tubesheet.
112 The Manufacturer may correlate rolling torque, hydraulic expanding pressure, or explosive charge with shear load
tests. For explosive expanding, the Manufacturer may correlate interference of fit.
701