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Fitness-for-service assessments of pressurized equipment

Inputs, checks and verdict in one PDF report, in SI or USC units.

  • API 579-1 Fitness-for-service
    • Metal loss and pitting
    • Creep damage
    • Crack-like flaws
    • Hydrogen damage
  • ASME B31.3 piping pressure design
  • ASME VIII-1 conical section design
  • ASME VIII-2 stress-strain and local strain material models
  • ASME VIII-3 stress-strain curve
  • BS 7910:2019 original issue, cylinder local thinning
  • Planned EN 13445
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  • 13 modules
  • Level 1 and Level 2
  • SI and USC
  • PDF report
  • No install

Crack-like flaw assessment

Sample report (PDF)

Acceptable

Load safety margin: 1.26

Toughness ratio Kr
0.65
Load ratio Lr
0.62
Crack depth a
5.00 mm
Failure assessment diagram with the assessment point for the crack depth on the slider Assessment point 1.26 × load Lr,max 0 0.2 0.4 0.6 0.8 1.0 1.2 0.2 0.4 0.6 0.8 1.0 Lr Kr
5.00 mm a/t 0.50
Wall section with a surface crack of depth a and length 2c in a wall of thickness t a t 2c Outside surface Inside surface
A hydrogen-induced crack running along the middle of a steel wall section 1

Crack growth

Fatigue crack growth

Cycles to failure
37732.88
Years
18.87
Failure (year-month-day)
2044-11-12

Crack depth a

Crack depth against years of operation for each initial depth, with a cross where it fails 0.005.0010.0015.0020.00 2.004.006.008.00 Years a [mm]

Failure assessment diagram

Failure assessment diagram with the path of each initial depth to its failure Lr,max 0 0.2 0.4 0.6 0.8 1.0 1.2 0.2 0.4 0.6 0.8 1.0 Lr Kr
  • Initial depth 2.00 mm
  • Initial depth 2.20 mm
  • Initial depth 2.40 mm
  • Initial depth 2.60 mm
  • Initial depth 2.80 mm
  • Initial depth 3.00 mm
  • Failure

0.00 cycles, year 0.00, a = 2.00 mm

Assessment dashboard

Corrosion, hydrogen damage and creep

Acceptance criteria

Hydrogen-induced cracking
Phased array ultrasonic C-scan with hydrogen-induced cracking indications in red 2
CheckActual (mm)Limit (mm)Utilization
Longitudinal extent s50.00≤ 84.8558.93%
Circumferential extent c50.00≤ 84.8558.93%
Through-thickness wH Governing5.00≤ 6.6675.00%
Sound metal to inner surface8.00≥ 4.0050.00%
Distance to weld Lw100.00> 40.0040.00%

Thickness profile

Local metal loss
Automated ultrasonic thickness map of a vessel shell in three scan strips, thin spots in orange and red 3
Measured wall thickness along the flaw, with its minimum, its average over the flaw length and the minimum required thickness tmm 8.40 tam 9.84 over s tmin 7.20 0 100 200 300 400 mm 8 10 12

Creep damage with wall loss

A row of glowing reformer tubes inside a furnace 4

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