Does this create a saturation curve?

No. It checks the T and 2T values you supply. Curve construction and saturation-point selection must follow the applicable SAE procedure.

Why check both intensity limits?

A result can sit above the minimum and still exceed the approved maximum, or leave too little margin to the upper limit for stable production.

Is a passing 10% result enough to release work?

No. Strip procedure, full specification compliance, machine settings, media control, coverage and required records still apply to the release decision.

Can different strip types be converted?

Do not assume interchangeability. Use the strip designation and conversion rules authorized by the governing specification for the job.

Abrasive Blasting, Shot Peening & Surface Prep calculator

Shot Peening Intensity Window and Saturation Check

Check a measured Almen intensity against both specification limits and the T-to-2T saturation criterion. Enter the intensities at T and 2T, both limits and the observed standard deviation.

What this calculator does

Measured saturation intensity against both specification limits and the T-to-2T saturation criterion, with coverage kept separate.

Formula used

T-to-2T increase = (intensity at 2T − intensity at T) ÷ intensity at T × 100
Nearest margin = min(T intensity − minimum, maximum − T intensity)
Estimated Cpk = nearest margin ÷ (3 × observed standard deviation)
Both the saturation criterion and the intensity window must pass

Inputs explained

Saturation Intensity: Almen arc height at the selected saturation time.
Intensity at Double Time 2T: Almen arc height at twice the selected exposure time.
Specified Minimum Intensity: Lower approved intensity limit for the strip designation.
Specified Maximum Intensity: Upper approved intensity limit for the strip designation.
Observed Intensity Standard Deviation: Within-condition standard deviation from repeat verification results.

How to use the result

Best suited to setup verification, intensity-window review, repeatability improvement.
Not a saturation-curve fitting or coverage determination engine. The governing drawing, process or customer specification controls acceptance.

Common questions

Does this create a saturation curve? No. It checks the T and 2T values you supply. Curve construction and saturation-point selection must follow the applicable SAE procedure.
Why check both intensity limits? A result can sit above the minimum and still exceed the approved maximum, or leave too little margin to the upper limit for stable production.
Is a passing 10% result enough to release work? No. Strip procedure, full specification compliance, machine settings, media control, coverage and required records still apply to the release decision.
Can different strip types be converted? Do not assume interchangeability. Use the strip designation and conversion rules authorized by the governing specification for the job.

Last reviewed 2026-10-01.