Bug in ASPENTECH HYSYS 2006 Dynamic Depressuring Fisher Valve model

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This post is for those use ASPENTECH HYSYS 2006 release...

New bug found in ASPENTECH HYSYS Dynamic Depressuring unit, [Fisher] Valve model...

Incident

The peak flow is higher when [Fisher] valve model under valve parameters in Dynamic depressuring Utility is selected.

Cause

There is a problem with the Fisher equation calculation in the 2006 dynamic tool. A disproportionate scale term in the equation has been used such that it causes wrong Cv and peak flow calculation.

Workaround

There is no workaround for time being and will be fixed in 2006.5 version, expected to be released in Jan 2008.

Source

This information has been informed by Kandan (nickname) and further advised by dyogal (nickname). I have finally got the confirmation from ASPENTECH via my personal account ( Incident no. 886087).

Updated on Oct 22, 2007

This bug only occurs in ASPENTECH HYSYS version 2006. They are fine in other vision such as 3.1, 3.2, 2004.1 and 2004.2.

Further Reading :

• Another descrepancy found in API Std 521Jan 2007
• Controlled and Non-controlled Type Depressuring.
• How to apply valve equation in HYSYS Depressuring ?
• 6 elements & factors lead to high quality question
• Carefully assess information in the web
• 12 Features required for Shutdown Valve (SDV)

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