Antisurge control valves are an essential component in an effective surge control system. These specialized control valves require superior dynamic response, robustness, and easy tuning.
Optimized Antisurge Control Valves
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compressor surge control
Angular Coordinate Method for Compressor Surge Control
The angular coordinate method allows to simplify the multi-level operation of the compressor to a one-dimensional visualization of the safe operating zone, presenting it as a direct comparison of the process variable with the set value, which is the most common and convenient practice for plant operators monitoring processes in the DCS.
Advanced PID Control Techniques in Centrifugal Compressors
A PID-based control strategy can manage surge margin by using feedforward signals from flow, pressure, or compressor speed fluctuations.
Better Understanding Compressor Surge
Process automation hall-of-fame member Greg McMillan made his book about centrifugal and axial compressor control freely available for download in PDF form.
How to Size Compressor Anti-surge Valves
Anti-surge valves protect centrifugal compressors from potentially catastrophic damage, but they are typically grossly oversized for common operating conditions. My article in the December 2024 issue of Automation.com, titled “The Art of Compressor Anti-surge Valve...
Centrifugal and Axial Compressor Control – Freely Available Educational Resource
Greg McMillan’s book, Centrifugal and Axial Compressor Control, delves into the complex control challenges associated with centrifugal and axial compressors, particularly in surge conditions. This is a unique opportunity to learn from a true industry leader.
Pick the Right Control Valves for Ethylene Service
In a Hydrocarbon Engineering article, Control Valve Selection for Ethylene Plants, Matthew Wagner describes how to choose the right combination of valve style, trim type, materials of construction, and digital positioners for critical valve application in an ethylene unit.
How Advanced Automation Technology Helps to Increase Capacity at LNG Regasification Plants
The owners of LNG regasification terminals are looking for ways to increase the operational efficiency of their assets while still ensuring that safety is never compromised. The application of a broad range of advanced digital technologies is helping them to meet this challenge and increase capacity at their plants.
Compressor Anti-Surge Control Value Improvement Practice
An ethylene plant has a number of very large, very critical compressors which will cause the entire plant to shutdown if they ever trip. The cracked gas compressor increases the entire cold-side feed from around 3 psig to ~475 psig, typically through 5 stages. The two refrigeration compressors are the next biggest compressors that can also shut down the entire plant if they trip.
Controlling Surge in Centrifugal Compressors
Given the possible harm to the equipment, a special surge prevention algorithm is required to efficiently protect the compressor. The controller response time also must be higher than for majority of other control loops. The Emerson DeltaV PK controller is a good example of fast-acting controller for compressor antisurge control.
Modeling and Controlling Compressor Surge
Some of the most perennially popular posts (say that fast 10 times!) here on the blog involve axial or centrifugal compressor surge control, or better stated—anti-surge control. In a paper presented at this year's AIChE Spring Meeting, Emerson's Greg McMillan—a member...
Selection Criteria in Compressor Anti-Surge Valves
Some of the most consistently popular posts here on the blog involve compressor anti-surge control. It's a condition in centrifugal and axial compressors where a flow reversal condition can occur. Wikipedia defines centrifugal compressor surge as: …the point at which...
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