I'm currently designing a Shell & Tube heat exchanger with SB-111 C68700 Tubes. In Section II-D, Table 1B, (pg. 182) the material is listed as being allowable for Section VIII, Div. 1 units up to a design temperature of 450°F. However, the material is not listed in Table Y-1 & Compress asignes the material a Yield Stress of 0 psi.
If Table 1B lists the material as usable for my design, why is it not listed in Y-1? Secondly, can I still use this material for my Section VIII, Div. 1 exchanger?
