Example 6-5 Actual Capacity for Process Vapor Plus Non-Condensable

Example 6-5 Actual Capacity For Process Vapor Plus Non-Condensable 

Often when the non-condensable quantity is known or estimated, it is important to stale whether these gases are in the presence of water or other process liquid. In this case, the amount of condensable vapor above the liquid must be considered as it also will enter the ejector suction. 

Many process systems fall in this group. They are handled in a similar manner to the other systems, correcting for temperature and molecular weight. 

This is the value to compare with a standard manufacturer s test or performance curve at 70°F. 

The air bleed is used to maintain a constant condition. However, a control valve may be used instead. Control or hand valves in the lower pressure vapor lines to an ejector are not recommended, as they must be paid for in system pressure drop and ejector utility requirements. 

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