10/31/22, 2:08 PM https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=15468 Interpretation Detail Standard Designation: B31.4 Edition/Addenda: 2009 Edition Para./Fig./Table No: 404.9.1 Subject Description: B31.4 Para 404.9.1 Defining "operating" pressure Date Issued: 09/26/2016 Record Number: 16-2331 Interpretation Number : B31.4-16-6 Question(s) and Reply(ies): Question: Does ASME B31.4-2016 404.9.1 refer to maximum operating pressure as defined in 400.2? Reply: Yes. Copyright © 2022 by the American Society of Mechanical Engineers. No reproduction may be made of this material without written consent of ASME https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=15468 1/1