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The HEI Standards for Steam Jet Vacuum Systems (7th Edition) is the primary global authority for the design, calculation, and testing of steam jet ejectors. These systems are the "workhorses" of the power and process industries, using high-pressure motive steam to create a vacuum without any moving parts.
Because ejectors are deceptively simple in appearance but complex in fluid dynamics (involving supersonic flow and shock waves), the HEI standards are critical for ensuring they are sized correctly for the specific non-condensable gas loads of a plant.
Technical Scope & Content
The 7th Edition covers the entire "ejector package," which typically includes the ejectors themselves, the inter-condensers, and the after-condensers. Key sections include:
Key Features of the 7th Edition
This edition modernized several aspects of ejector technology to align with current environmental and efficiency goals:
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