Known Issues

Petro-SIM v7.6 Known Issues and Notes

Petro-SIM
Assay Synthesis
Various improvements have been made to how assay synthesis handles streams or cuts with distillation and composition data, which generally improve the match to distillation when the Naphtha modification: estimate components – Estimate as much as possible is used. There are a few issues remaining that will be addressed in a second beta release, alongside further improvements in situations when cuts overlap:
1. May see a crash with synthesis of streams defined only by extended components
2. May see incorrect C:H Ratio values when Estimate as much as possible is not used. It can appear as large corrections in data reconciliation

New NOMAD solver
The user can select “Parallel Solve” but there are some problems:
1. There is a random bug in the release build that can cause “Parallel Solve” to reproducibly fail. This may prevent some models from being solved using that mode
2. If one of the parallel solves fails, it causes all subsequent solves within a block of parallel solves to fail. This makes the solve inefficient, but it does not fail to converge. The user would not be aware of this problem as it is not reported
3. The “Parallel solve” management code sometimes launches too many instances of Petro-SIM, consuming computer resources unnecessarily. This does not prevent the optimiser from working

LP Data Generation using C# in Excel
Dear user, we have identified an issue with the functionality of the Excel add-in. We are actively working on resolving it, and it will be fully addressed in the commercial version of Petro-SIM v7.6.

RX Suite
DHTR-SIM
Simulations of hydroisomerization reactors can fail because of paraffin reactants going negative without being properly detected. Can appear as the reactor looking like it has solved but no composition data in available in the reactor effluent stream

Burner
It will predict consuming twice the required air flow for burning carbon monoxide as is needed

FCC-SIM
It can crash when bio feed stream rate is set to zero

All the issues in green font mentioned above are all fixed in Build 7033, please contact our Technical Support team to get this new build.