Analyze multiple metal thickness readings, compare inspection points, identify thickness-loss patterns and flag readings that may require closer review.
Analysis Settings
The attention threshold is a screening value only. It does not establish the minimum allowable thickness for a component.
Inspection Readings
Point
Location / Label
Current Thickness
Previous Thickness
Inspection Interval (years)
Enter inspection readings and press Analyze Inspection Data.
Inspection Analysis
Overall Pattern
—
Readings
—
valid points
Average
—
thickness
Minimum
—
thickness
Maximum
—
thickness
Spread
—
max − min
Thickness Pattern
The chart provides a visual comparison of entered thickness readings. It is not a calibrated inspection plot.
Inspection Point Results
Point
Location
Current
Previous
Loss
Loss %
Rate
Pattern
Status
Pattern Summary
Thickness Distribution
Average thickness—
Minimum reading—
Maximum reading—
Thickness spread—
Low-reading points—
Historical Change
Points with previous data—
Points showing loss—
Highest loss rate—
Average loss rate—
Pattern classification—
Thickness-Loss Calculation
Where both current and previous readings are available for the same inspection point, the apparent thickness loss is calculated directly.
Thickness Loss = Previous Thickness − Current Thickness
The percentage loss compares the observed loss with the previous thickness.
Loss % = (Thickness Loss ÷ Previous Thickness) × 100
A negative calculated loss means the current reading is greater than the previous reading. This can result from measurement variability, surface condition or differences in inspection location.
Apparent Corrosion Rate
If an inspection interval is supplied, the analyzer calculates an indicative average thickness-loss rate.
Apparent Loss Rate = Thickness Loss ÷ Inspection Interval
Rates are shown in the selected thickness unit per year after converting the entered interval to years.
How Patterns Are Flagged
Low reading: current thickness is at or below the entered attention threshold.
High variation: a reading differs substantially from the overall average based on the entered variation threshold.
Thickness loss: the current reading is lower than the previous reading.
Stable / no demonstrated loss: current thickness is equal to or greater than the previous reading.
Loss cluster: several inspection points show positive historical thickness loss.
Localized variation: the dataset contains a comparatively small number of readings substantially below the dataset average.
These classifications are data-screening indicators. They do not diagnose the underlying corrosion mechanism and should not be interpreted as a structural integrity determination.
Important Limitations
This tool analyzes the numbers entered by the user and does not validate inspection quality.
It does not determine minimum allowable thickness.
It does not perform fitness-for-service calculations.
It does not distinguish uniform corrosion from pitting with certainty.
It does not account for measurement uncertainty unless the user interprets the results accordingly.
Different inspection locations must not be treated as historical pairs unless they represent comparable points.
A high or low reading may reflect measurement variation rather than actual metal loss.
Corrosion rates may change with environment, process conditions and time.
Localized pits and isolated defects may require separate inspection methods.
The analyzer does not establish inspection intervals or remaining service life.
Inspection warning: Use this tool for preliminary data screening and inspection-data organization only. Corrosion assessment, remaining-life decisions and fitness-for-service determinations should be performed using applicable engineering requirements and qualified inspection or engineering personnel.
Frequently Asked Questions
What does the Corrosion Inspection Data Analyzer do?
It analyzes multiple thickness readings and summarizes average thickness, minimum and maximum values, thickness spread, historical loss and apparent loss rates.
How many readings can I enter?
The calculator provides 20 inspection points for a practical small inspection dataset.
Can I compare current and previous readings?
Yes. Each inspection point has fields for both current and previous thickness.
Can the tool identify low-thickness areas?
Yes. You can enter an attention threshold and the analyzer flags current readings at or below that value.
Does it identify corrosion mechanisms?
No. The tool can identify numerical patterns such as loss and variation, but it cannot determine whether the underlying mechanism is uniform corrosion, pitting, erosion or another damage mechanism.
Is the result an engineering inspection report?
No. It is a preliminary data-analysis tool and does not replace inspection records, engineering assessment or fitness-for-service evaluation.