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    Friday, May 22, 2015   Blog   Search   

Hypothetically Speaking: Why you should not use normal alkanes to replace pseudocomponents

May 20 2015
Predictions of phase equilibrium in hydrocarbon systems require proper descriptions of the inlet composition and constituent components. When working with GC analyses for hydrocarbon liquids, it is not enough to simply use a normal alkane to describe the variety of species that may share the same carbon number. Hypothetical or “pseudocomponents” are required, described using their molecular weight and gravity, to ensure accurate and consistent results from flash separations as well as working and breathing losses.

Bubble Babble: The Predicted Bubble Point Really Matters

May 20 2015
Accurate predictions of atmospheric tank flash emissions depend on high quality thermodynamic properties and calculation methods as can be found in ProMax.  They also require high quality laboratory analyses of pressurized liquid samples.  To check the validity of these analyzed compositions, please make sure to compare measured temperature from the pressurized separator with the bubble point temperature calculated in ProMax.  If the bubble point is higher than the measured separator temperature, then emissions will be under-predicted.

Where Do I Even Start?

Jan 16 2014
ProMax offers a large selection of variables that can be specified by the user, and for anybody new to simulation software this freedom can be quite daunting.  How do you know which ones to set manually and which are better left for the program to calculate?  Here are some tips to help get you started:

Property Input Property Stencil

Jul 19 2013
The Property Input property stencil allows the user to display and change an input property directly on the stencil. The variable may be almost any user-definable variable in ProMax, including flow rates, temperatures, energy rates, and even User Defined Variables.

Modeling Seawater in ProMax

Jun 14 2013
To model a brine solution in ProMax, the acids and bases comprising the salts must be entered along with water, and the Electrolytic ELR property package must be used. In the Electrolytic Property Packages the acids and bases dissociate to form the ionic species, and the salt concentration can be viewed by adding an Ionic Info Analysis...

Modeling a Co-Current Heat Exchanger in ProMax

May 10 2013
A number of factors contribute to heat exchanger performance, including the flow configuration. Counter-current exchangers are more efficient (and therefore more common) because they maintain a larger temperature difference between the two fluids across the length of the exchanger. Nevertheless, co-current exchangers are still used on occasion, and both may be modeled accurately in ProMax...

Tank Losses Property Stencil

Apr 26 2013
The ProMax Tank Losses stencil is used to estimate the rate and composition of volatile losses from a liquid storage tank. Flashing, working, breathing, and loading losses are considered. The estimation is based on ProMax thermodynamics and the Environmental Protection Agency’s AP-42 methodology.

Pipeline Mach Number Property Stencil

Apr 11 2013
The Mach number is a dimensionless quantity representing the ratio of the actual fluid velocity to its speed of sound. Have you ever needed to calculate the Mach number in your pipeline simulations? In ProMax you can use the property calculator called Pipeline Mach Example to display the maximum fluid Mach number in your Flowsheet...
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