Creep damage and long term life modelling of an X20 steam line component

Pertti Auerkari, Jorma Salonen (Corresponding Author), Stefan Holmström, anssi Laukkanen, Juhani Rantala, R. Nikkarila

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Hot steam lines operate at high temperatures and are designed against creep. In service they will consume the creep life at the highest rate in locations with the most adverse combination of material strength (weakness) and high stress (e.g. system loads). Adverse effects in stress state are promoted by features of geometry and discontinuities in the materials properties. In practice it is essential to find the areas of maximum damage, as these will determine the locations and timing to inspect and finally to repair or replace before failures or unplanned outages. The inspection experience from power plant steam systems have provided the established views on the expected locations of the early creep damage, and rules on timing the next inspection. The experience has also shown that optimal timing is materials dependent, and that the steel grade X20CrMoV11-1 (X20, 11% Cr steel) performs particularly well in the inspection statistics. This paper describes a case with observed creep cavitation and cracking in a branch weld of a X20 steam header that was replaced after 135,000 service hours. The characteristics of the observed damage and its evolution are discussed.
Original languageEnglish
Pages (from-to)508-515
Number of pages7
JournalEngineering Failure Analysis
Volume35
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Steam piping systems
Creep
Inspection
Steel
Steam power plants
Steam
Cavitation
Outages
Strength of materials
Loads (forces)
Materials properties
Welds
Repair
Statistics
Geometry
Temperature

Keywords

  • creep
  • life time estimation
  • modelling
  • steam line
  • ProperTune

Cite this

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title = "Creep damage and long term life modelling of an X20 steam line component",
abstract = "Hot steam lines operate at high temperatures and are designed against creep. In service they will consume the creep life at the highest rate in locations with the most adverse combination of material strength (weakness) and high stress (e.g. system loads). Adverse effects in stress state are promoted by features of geometry and discontinuities in the materials properties. In practice it is essential to find the areas of maximum damage, as these will determine the locations and timing to inspect and finally to repair or replace before failures or unplanned outages. The inspection experience from power plant steam systems have provided the established views on the expected locations of the early creep damage, and rules on timing the next inspection. The experience has also shown that optimal timing is materials dependent, and that the steel grade X20CrMoV11-1 (X20, 11{\%} Cr steel) performs particularly well in the inspection statistics. This paper describes a case with observed creep cavitation and cracking in a branch weld of a X20 steam header that was replaced after 135,000 service hours. The characteristics of the observed damage and its evolution are discussed.",
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author = "Pertti Auerkari and Jorma Salonen and Stefan Holmstr{\"o}m and anssi Laukkanen and Juhani Rantala and R. Nikkarila",
year = "2013",
doi = "10.1016/j.engfailanal.2013.05.008",
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journal = "Engineering Failure Analysis",
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Creep damage and long term life modelling of an X20 steam line component. / Auerkari, Pertti; Salonen, Jorma (Corresponding Author); Holmström, Stefan; Laukkanen, anssi; Rantala, Juhani; Nikkarila, R.

In: Engineering Failure Analysis, Vol. 35, 2013, p. 508-515.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Creep damage and long term life modelling of an X20 steam line component

AU - Auerkari, Pertti

AU - Salonen, Jorma

AU - Holmström, Stefan

AU - Laukkanen, anssi

AU - Rantala, Juhani

AU - Nikkarila, R.

PY - 2013

Y1 - 2013

N2 - Hot steam lines operate at high temperatures and are designed against creep. In service they will consume the creep life at the highest rate in locations with the most adverse combination of material strength (weakness) and high stress (e.g. system loads). Adverse effects in stress state are promoted by features of geometry and discontinuities in the materials properties. In practice it is essential to find the areas of maximum damage, as these will determine the locations and timing to inspect and finally to repair or replace before failures or unplanned outages. The inspection experience from power plant steam systems have provided the established views on the expected locations of the early creep damage, and rules on timing the next inspection. The experience has also shown that optimal timing is materials dependent, and that the steel grade X20CrMoV11-1 (X20, 11% Cr steel) performs particularly well in the inspection statistics. This paper describes a case with observed creep cavitation and cracking in a branch weld of a X20 steam header that was replaced after 135,000 service hours. The characteristics of the observed damage and its evolution are discussed.

AB - Hot steam lines operate at high temperatures and are designed against creep. In service they will consume the creep life at the highest rate in locations with the most adverse combination of material strength (weakness) and high stress (e.g. system loads). Adverse effects in stress state are promoted by features of geometry and discontinuities in the materials properties. In practice it is essential to find the areas of maximum damage, as these will determine the locations and timing to inspect and finally to repair or replace before failures or unplanned outages. The inspection experience from power plant steam systems have provided the established views on the expected locations of the early creep damage, and rules on timing the next inspection. The experience has also shown that optimal timing is materials dependent, and that the steel grade X20CrMoV11-1 (X20, 11% Cr steel) performs particularly well in the inspection statistics. This paper describes a case with observed creep cavitation and cracking in a branch weld of a X20 steam header that was replaced after 135,000 service hours. The characteristics of the observed damage and its evolution are discussed.

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KW - modelling

KW - steam line

KW - ProperTune

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