This case checked the program’s present pressure model, in which pressure is applied as an axial force pA_i on the element, added to the thermal force, and the longitudinal pressure stress is then left out. That model is wrong. In the wall of a pipe held at both ends, temperature causes compression and pressure causes tension of about νσ_H: they act in opposite senses and do not add. On the anchors both push, but the pressure’s share is about (1 − 2ν)pA_i, some 40 % of the closed-end force, not all of it (Part III B, Status). The case will be rebuilt on the corrected mechanics.