Tank, Vessel & Pressure Equipment Fabrication worked example

Weld Length Estimate with weld defect severity rating of 15 score: a worked example

Push weld defect severity rating up to 15 score and the picture changes. This example computes every intermediate figure at that operating point. Use it when weld length estimate in tank, vessel and pressure equipment fabrication needs a defensible ranking against other tank, vessel and pressure equipment fabrication risks for the next review.

The inputs for this scenario

  • Weld defect severity rating: 15 score (raised for this scenario; the documented default is 6)
  • Defect occurrence likelihood: 4 score (unchanged)
  • Inspection detection difficulty: 3 score (unchanged)

Working through the calculation

  • Applying the documented formula (Weld Length Estimate risk score = severity × 0.40 + occurrence × 0.35 + detection × 0.25) to the inputs above produces each figure below.
  • At this operating point the engine returns 8.15 ft for risk score, the number this scenario is built around.
  • At this operating point the engine returns 15 score for severity.
  • At this operating point the engine returns 4 score for occurrence.
  • At this operating point the engine returns 3 score for detection.

How this compares with the baseline

  • Against the tool's baseline example, where weld defect severity rating sits at 6 score and the headline result is 4.55 ft, this scenario comes in 79.12% above the baseline at 8.15 ft.
  • It computes a single risk score by weighting the severity, occurrence, and detection ratings at 40%, 35%, and 25% respectively. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Risk score: 8.15 ft (headline result)
  • Severity: 15 score
  • Occurrence: 4 score
  • Detection: 3 score

Run it with your numbers

  • Every input above is editable in the live Weld Length Estimate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.