prEN IEC 63230:2025
(Main)Fatigue assessment of hydraulic turbine runners: from design to quality assurance
Fatigue assessment of hydraulic turbine runners: from design to quality assurance
Ocena utrujenosti tekačev hidravlične turbine: od načrtovanja do zagotavljanja kakovosti
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Ocena utrujenosti tekačev hidravlične turbine: od načrtovanja do zagotavljanja
kakovosti
Fatigue assessment of hydraulic turbine runners: from design to quality assurance
Ta slovenski standard je istoveten z: prEN IEC 63230:2025
ICS:
27.140 Vodna energija Hydraulic energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
4/522/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63230 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-03-21 2025-06-13
SUPERSEDES DOCUMENTS:
4/508/NP, 4/512A/RVN
IEC TC 4 : HYDRAULIC TURBINES
SECRETARIAT: SECRETARY:
Canada Mrs Christine Geraghty
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Fatigue assessment of hydraulic turbine runners: from design to quality assurance
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
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2 IEC CDV 63230 ED1 © IEC 2025
1 CONTENTS
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 7
6 3 Terms, definitions, symbols and units . 8
7 3.1 General . 8
8 3.2 General terminology . 8
9 3.3 Units . 11
10 3.4 Acronyms . 12
11 3.5 Subjective terms . 12
12 4 Stress history from expected load events. 13
13 4.1 Purpose and scope . 13
14 4.2 Load events . 13
15 4.3 Stress history and stress spectrum . 14
16 4.4 Stresses determined by calculation . 15
17 4.4.1 Stresses in steady state conditions . 15
18 4.4.2 Stresses in transient conditions . 20
19 4.5 Stresses determined from on-site strain measurements . 20
20 4.5.1 Test procedure . 20
21 4.5.2 Instrumentation, acquisition and signal treatment . 20
22 4.5.3 Hotspot stress history determination . 21
23 5 Fatigue life assessment . 23
24 5.1 Purpose and scope . 23
25 5.2 S-N curve assessment . 23
26 5.2.1 Design S-N curve . 23
27 5.2.2 Mean stress effect . 24
28 5.2.3 Residual stress . 25
29 5.2.4 Cumulated damage calculation . 25
30 5.3 Fracture mechanics assessment . 26
31 5.3.1 Loading conditions . 26
32 5.3.2 Fatigue crack growth law . 27
33 5.3.3 Fatigue crack growth threshold . 28
34 5.3.4 Definition of flaw . 28
35 5.3.5 Recommended limit to crack growth to be used in the calculation . 29
36 5.3.6 Stress intensity factor solution . 29
37 6 Manufacturing and quality assurance . 31
38 6.1 Purpose and Scope. 31
39 6.2 Engineering instruction for manufacturing . 31
40 6.2.1 Designer responsibilities . 31
41 6.2.2 Hotspot area definition . 31
42 6.3 Quality management . 33
43 6.4 Manufacturing requirements . 33
44 6.4.1 Material Properties . 33
45 6.4.2 Welding . 33
46 6.4.3 Defects removal. 34
47 6.4.4 Post-weld heat treatment . 34
48 6.4.5 Non-destructive testing (NDT) . 35
IEC CDV 63230 ED1 © IEC 2025 3
49 6.4.6 Corrosion protection . 37
50 6.4.7 Manufacturing tolerances. 37
51 Annex A (informative) Finite element analysis best practices . 38
52 Annex B (informative) Guidance on the necessity of conducting a fatigue assessment . 40
53 B.1 Introduction . 40
54 B.2 Suggested characteristic of runners for which a fatigue assessment is not
55 required . 40
56 B.3 Suggested requirements and allowable stresses when fatigue assessment is
57 not required . 41
58 Bibliography . 42
60 Figure 2 – Example of load events included in a start-stop sequence . 14
61 Figure 3 – Example of a Francis runner strain measurement history during a start-stop
62 sequence with multiple power outputs [2] . 15
63 Figure 4 – Stochastic stress history of a steady state condition . 17
64 Figure 5 – Standard normalized stochastic stress spectrum curve and stress spectra
65 for real strain gauge data from which it was defined. . 19
66 Figure 6 – Stress spectrum combination method for predicted periodic and stochastic
67 stresses . 19
68 Figure 7 – Schematic representation of the localisation of strain gauges within a
69 prediction strain pattern [8] . 21
70 Figure 8 – Example of a goodness-of-fit representation between measurement and
71 simulation results. . 22
72 Figure 9 – Design S-N curve for 13%Cr-4%Ni stainless steel in river water at R = -1
73 (see 4.3 for stress amplitude calculation). . 24
74 Figure 11 – Creation of the design fatigue life load history based on typical 1-year load
75 histories from assembled load sequences for fracture mechanics assessments . 27
76 Figure 12 – Standardized crack propagation curves for 13%Cr-4%Ni stainless steel
77 according to Equation (5) . 28
78 Figure 13 – Definition of recommended initial flaw shapes for a) surface flaws b)
79 embedded flaws (adapted from BS7910 [16]) . 29
80 Figure 14. Illustration of the location and the definition of the hotspot areas on a
81 Francis runner (R1 : connection radius on blade pressure side; R2 : connection radius
82 on blade suction side; R3 connection radius on blade outflow surface) . 32
84 Table 1 – Example of specified expected steady state conditions. 13
85 Table 2 – Example of specified expected transient conditions . 14
86 Table 3 – Main sources of runner excitation . 16
87 Table 4 – Design S-N curve coefficients for 13%Cr-4%Ni stainless steels in river water. 24
88 Table 5 – Parameters of the 13%Cr-4%Ni fatigue crack growth law . 28
4 IEC CDV 63230 ED1 © IEC 2025
92 INTERNATIONAL ELECTROTECHNICAL COMMISSION
93 ____________
95 Fatigue assessment of hydraulic turbine runners: from design to quality
96 assurance
98 FOREWORD
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