Calculators
The integrity math, free, with the formula shown.
Corrosion rate and remaining life, tMin and MAWP by design code, ASME B31G, RBI risk rank, and the inspection interval. The same functions the platform runs.
Corrosion rate and remaining life calculator
Free calculator for long-term and short-term corrosion rate, the governing rate, remaining life and the half-life interval cap, per API 510 and API 570.
Open the calculator ASME B31.3, ASME VIII, API 653Minimum thickness and MAWP calculator
Free tMin and MAWP calculator: ASME B31.3 piping with schedule pick and mill tolerance, ASME VIII vessels with heads, API 653 tanks, formula shown, API 579 Level 1 screen.
Open the calculator ASME B31GASME B31G remaining strength calculator
Free ASME B31G calculator for a corroded pipe area: original and modified methods, 1991 and 2012 editions, safe pressure, ERF and disposition, in inches and psi.
Open the calculator API 580 and API 581RBI risk rank calculator
Free semi-quantitative RBI calculator: probability from remaining life and corrosion rate, consequence from fluid and system criticality, risk score and rank 1 to 5 per API 580 and 581.
Open the calculator API 510 and API 570Inspection interval calculator
Free calculator for the risk-based inspection interval: base interval by RBI rank, capped at half the remaining life, floored at three months, per API 510 and API 570.
Open the calculator Coatings and fireproofingSurface area calculator for coating and fireproofing
Free surface area calculator for painting, blasting and fireproofing: pipe by NPS with fitting factors, vessels with heads, tanks, cylinders, plates and boxes, summed by line item.
Open the calculator CoatingsPaint consumption and coverage calculator
Free paint consumption calculator: wet film thickness from DFT and volume solids, theoretical and practical spreading rate, litres and gallons per coat, with a loss factor.
Open the calculator ISO 8502-4Dew point and surface temperature calculator
Free dew point calculator for blasting and coating work: dew point from air temperature and humidity, the surface minus dew point margin, and the 3 °C rule from ISO 8502-4.
Open the calculator ASME B31.3, B31.1, VIIIHydrotest pressure calculator
Free hydrostatic test pressure calculator for ASME B31.3 and B31.1 piping and ASME VIII Division 1 vessels, including the stress ratio and the B31.3 pneumatic test.
Open the calculator Radiographic testingRadiography exposure time calculator
Free radiographic exposure calculator: scale your technique chart by half-value layer and inverse square for Ir-192, Co-60 and Se-75 sources, and get exposure time from activity.
Open the calculator Ultrasonic testingUltrasonic angle beam skip distance calculator
Free ultrasonic angle beam calculator: half and full skip surface distance, leg and V-path sound path, and the depth and surface distance of an indication from its sound path.
Open the calculator SSPC-PA 2SSPC-PA 2 dry film thickness acceptance calculator
Free SSPC-PA 2 calculator: enter the specified DFT range, the restriction level and your spot measurements, and get the area average and a conformance verdict with the failing spots.
Open the calculator ASME B36.10MPipe schedule chart
ASME B36.10M pipe outside diameter, wall thickness, and plain-end weight by nominal size and schedule.
Open the chartAnswers
Calculator questions
Are these calculators free to use?
Yes. No sign-up, no download. Each one shows the design code and formula it applied so the result can be checked against the standard.
Do they match what intelliSPEC computes?
Yes. The math is ported from the platform's integrity functions: tMin and MAWP routed by equipment type, corrosion summary and remaining life, semi-quantitative RBI scoring, the half-life interval cap, and the shared ASME B31G implementation.
Can I rely on a result to set an inspection date?
Treat every result as advisory. Intervals and ratings are set by qualified inspectors and engineers under the owner's program and the governing code edition. The calculators exist so the basis is visible, not to replace that judgement.
Which units do the calculators use?
Pressure in bar, stress in MPa and lengths in mm for tMin, MAWP, corrosion rate and interval, the platform's units. B31G uses inches and psi because the standard's verified vectors are US customary.