What should the steam pressure at the ejector nozzle of a steam jet typically be?

The steam pressure at the ejector nozzle of a steam jet is typically set around 150 PSIA because this pressure provides an effective balance between efficiency and performance for most applications. At this pressure, the steam has sufficient energy to create a strong vacuum when it expands through the nozzle. This expansion allows the ejector to move air or other gases efficiently, making it ideal for various HVAC and industrial processes.

Selecting a lower pressure might not generate enough energy for effective gas movement, while higher pressures, like 200 PSIA or 250 PSIA, can lead to increased operational costs and diminished returns in efficiency. Hence, 150 PSIA is considered optimal for maximizing both performance and cost-effectiveness in steam jet applications.