ASME B31.3 - Interpretations [5] - PWHT & Preheat Related

ASME 31.3 - INTERPRETATIONS

PREHEATING & PWHT RELATED

Interpretation: 19·04

Subject: B31.3-1999 Edition (2000 Addenda), Para. 332.1, General and Para. 332.4, Required Heat Treatment

Date Issued: January 4, 2002

File: B31-01-o38

Question (1): May pipe be bent using both hot and cold methods simultaneously on the same bend, such as might occur during the induction bending process?
Reply (1): Yes.
Question (2): For P-Nos. 3, 4, 5, 6, and lOa materials in which pipe is bent using both hot and coldmethodssimultaneouslyonthesamebend(suchas mightoccurduringtheinductionbending process), is heat treatment required after bending in accordance with para. 332.4.17
Reply (2): Yes.
Question (3): For P-Nos. 3, 4, 5, 6, and lOa materials in which pipe is bent using both hot and coldmethodssimultaneouslyonthesamebend(suchas mightoccurduringtheinductionbending process), is heat treatment required after bending in accordance with para. 332.4.2 ifnone of the conditions in para. 332.4.2(a), (b), or (c) exist?
Reply (3): No; however, heat treatment would be required in accordance with para. 332.4.1.
Question (4): For materials other than P-Nos. 3, 4, 5, 6, and lOa materials in which pipe is bent using both hot and methods simultaneously on the same bend (such as might occur during the induction bending process), is heat treatment after bending in accordance with para. 332.4.2 required if none of the conditions in paras. 332.4.2(a), (b), or (c) exist?
Reply (4): No, unless otherwise specified in the engineering design.


Interpretation: 18-04

Subject: ASME B31.3-1999 Edition, Para. 331.2, Heat Treatment Specific Requirements
Date Issued: May 31, 2000
File: B31-oo-006
Question: In accordance with ASME B31.3-1999 Edition, may alternative heat treatment methods or exceptions be specified in the engineering design?
Reply: Yes. See para. 33 I.2.