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As a part of the extensive testing performed by Engineered Software, Inc. prior to releasing a software product, ESI compared and analyzed the differences between the two versions. Because users model piping systems that have a variety of configurations, devices, fluids, pipe sizes, boundary conditions, it is impossible to predict what changes a particular model may see. The following table summarizes the typical change that may be seen between the two versions for files without laminar flow conditions (low Reynolds Number), convergence problems, or sonic (choked) flow conditions

parameterAverage changeMax change
calculated flow through all devices0.006%0.95%
pipe calculated flow0.003%0.9%
balancing orifice calculated flow0.03%0.9%
orifice meter calculated flow0.08%0.9%
nozzle meter calculated flow0.09%0.1%
venturi meter calculated flow0.0004%0.0004%

The results in v16.1 more accurately predict sonic flow through flow meters and balancing orifices in gas applications and in some edge cases where flow conditions were just under sonic flow conditions, v16.1 may throw a sonic flow warning that may not be thrown in v16.0. Users are highly encouraged to evaluate their particular models to evaluate the impact on their results.