I believe the CAESAR II calculation of VAL is the same as the equation listed in the Peng book. The program lists this value during the generation of the buried model.

Since CAESAR II uses a flexible axial restraint to model friction rather than a rigid-then-free (stick-slip) restraint, the CAESAR II results will show a longer length of straight pipe is required to lock in the potential growth of the line.

By the way, CAESAR II has two soil models: 1) the Peng method (from his article in Pipe Line Industry magazine) and 2) the American Lifelines Alliance.