Transcription of Safe Design and Operation of a Cryogenic Air …
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Safe Design and Operation of a Cryogenic Air …
2-c safe Design and Operation of a Cryogenic Air Separation Unit Schmidt1, Winegardner1, M. Dennehy2, and H. Castle-Smith2 1 air products and Chemicals, Inc. 7201 Hamilton Blvd. Allentown, PA 18195 USA 2 air products PLC Hersham Place Molsey Road Walton-on-Thames Surrey, UK KT12 4RZ Prepared for Presentation at the AICHE 35th Annual Loss Prevention Symposium Protection for Special Occupancies April 22-26, 2001 Houston, TX Unpublished Copyright air products and Chemicals, Inc. AIChE shall not be responsible for statements or opinions contained in papers or printed in its publications. 1 ABSTRACT Cryogenic Air Separation Units (ASU s) frequently supply oxygen and nitrogen to chemical, petroleum and manufacturing customers. Typically, the ASU is located remotely from the use point, and the products are supplied via a pipeline. This paper provides the basic Design and operating methods to safely operate an ASU. The four primary hazards associated with an ASU are (1) the potential for rapid oxidation, (2) interfaces between the ASU and the downstream systems, (3) pressure excursions due to vaporizing liquids, and (4) oxygen enriched or deficient atmospheres.
3 Air Products has reported that CO2 and N2O form a solid solution (9), and this has recently been confirmed by others (10). This means that the CO2 solubility is lower when N2O is present in appreciable quantities and vice-versa. The computation of solubility must take this in to account,
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