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Thermal Stress Ratchet Check in Piping Analysis

[+] Author Affiliations
R. Adibi-Asl, M. Noban, E. Chen

Amec Foster Wheeler, Toronto, ON, Canada

Paper No. PVP2017-66008, pp. V01AT01A036; 6 pages
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 1A: Codes and Standards
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5790-8
  • Copyright © 2017 by ASME


The ASME B&PV Code, Section III NB-3600 provides a requirement to avoid thermal stress ratcheting under thermal transient conditions. The ratchet check in this code is based on calculating the range of temperature difference between the outside and inside surfaces of the pipe for pairs of load sets. The calculated temperature ranges are then compared with a code equation which is a function of pressure, geometry and material properties.

This paper reviews the thermal stress ratchet requirements in ASME Section III Subsection NB with respect to piping analysis. A simplified formula is proposed for thermal stress ratchet check which eliminates the difficulties and ambiguities associate with the formulation provided in the NB-3600 code. The paper also investigates temperature distributions for various components (including flat plate and pipe) by performing heat transfer analysis. The results are compared with the ratchet limit. Using plate solutions to estimate the temperature range of pipe could sometimes give non-conservative results.

Copyright © 2017 by ASME



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