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--- supply_chain_common_terms [2024/04/25 08:59] – 204.62.206.252
+++ supply_chain_common_terms [2024/10/16 10:17] (current) – [Windmilling] 204.62.206.252
@@ Line 7: / Line 7: @@
 ===== Windmilling =====
-Running a plant connected to a pipeline while the pipeline customer is down and not taking anything
+Windmilling an Air Separation Unit (ASU) involves operating the unit at a significantly reduced capacity, typically during periods of low demand, to keep the equipment ready for full production while minimizing energy consumption. In this state, the plant's core machinery, such as compressors and turbines, are run at minimal or idle power to maintain the cryogenic temperatures required for air separation, without producing large quantities of oxygen, nitrogen, or argon.
+Technically, this process keeps the refrigeration cycle and cryogenic distillation columns operational, ensuring that the cold box remains at optimal temperatures, preventing the need for a full warm-up and cool-down cycle. The main air compressor (MAC) may be run at a low flow rate, just enough to maintain pressure within the system. The expansion turbines may also operate in a low-load state to keep the refrigeration cycle active, but without significant air liquefaction or distillation.
+The benefit of windmilling is maintaining the thermal and operational stability of the ASU, reducing stress on the equipment from frequent shutdowns and restarts. However, careful control of power usage and flow rates is required to ensure the system doesn’t drift outside operational limits, risking inefficiency or equipment damage.
 ===== Down/Outage =====
 ==== APSAs / Onsites ====