UTCal vs NDT Nation

Your UT Bible, built for the field. Skip distance, D1.1 acceptance, beam path diagrams, encoder calibration, pipe data, and code criteria — offline, right in your pocket. Built by a working UT and PAUT tech for NDT techs in the field. No account. No internet. No subscription. Runs entirely on-device. CALCULATOR • Skip distance, half skip, and full skip for any angle and thickness • Beam spread — near-field distance, half-angle, and full spread • AWS D1.1 indication rating • Fracture mechanics — critical flaw size & ASME VIII Div 2/3 evaluation • Transfer correction (dB) • Encoder step resolution converter — steps/mm ↔ steps/in, with target-distance conversion for OmniScan PAUT and TOFD scanner calibration • Imperial and metric — switch units anytime BEAM PATH DIAGRAM • Interactive cross-section of your beam path through the material • Drag the probe to see coverage and position change in real time • Rotate to landscape for a fullscreen diagram WELD OVERLAY • Overlay Single V or Double V weld joint profiles on the beam path diagram • 5 standard weld presets, or enter custom bevel angle, root opening, and root face • Index offset — see where your probe index point sits relative to the weld centerline PIPE DATA • NPS 1/8" through 48" per ASME B36.10M • OD, ID, wall thickness, and scan length for every standard schedule • Stainless steel schedules where wall thickness differs from carbon steel (dual ASME standard support) • Apple Watch companion — quick pipe lookups on your wrist CODE ACCEPT/REJECT CRITERIA • ASME Section V, Article 4 • ASME B31.3 — Process Piping • AWS D1.1 — Structural Welding • API 1104 — Pipeline Welding • Inches and millimeters, side by side SETUPS & HISTORY • Build and save complete job setups — material, angle, frequency, weld geometry, and notes • Save calculation results with names and notes, then recall them in one tap for your records • Custom presets for your most-used configurations FREE & PRO • Free to download — skip distance, Snell's law, and a hands-on trial of every Pro tool • The full pipe chart is free for your first 10 lookups, then part of Pro • UTCal Pro unlocks unlimited use of everything: the full pipe chart, saved calculation history, custom presets & weld builder, encoder calculator, fracture mechanics, beam path diagrams, weld overlay, the full code library, and the Apple Watch app • One-time purchase — no subscription, ever WHY UTCAL • Built by a UT tech who got tired of doing skip math on a paper napkin • Works on the roof, in the ditch, in the shop — no signal required • Updated for the latest ASME, AWS, and API editions Questions or feature requests: support.utcal@carboncode.app

NDT Nation is the field reference built by RT people, for RT people: 60 verified calculators, a standards reference library and three full exam-prep banks — all working offline at the shot location. 60 CALCULATORS • RT — film density by code, R-factors, source decay, exposure correction, geometric unsharpness, boundary estimate, blow factor, wall shot selector, IQI/density check, % sensitivity, HVL attenuation, inverse-square, isotope reference, film development, pipe schedule • UT / PAUT / TOFD — wavelength, near field, beam spread, Snell's law, angle-beam path, dB/amplitude, attenuation correction, thickness by echo, temperature correction, scan calculator, DAC/TCG helper, wedge refraction, TOFD setup • MT — coil shot, prod current, yoke lift test, demagnetization check • ET — depth of penetration, fill factor, phase/impedance, limit frequency • PT / VT — dwell time and dwell grid, lighting, coverage check • Welding — heat input, fillet weld size, pipe hi-lo, weld symbols, preheat/interpass, PWHT time and temperature, undercut acceptance, camber • Materials — carbon equivalent, bolt torque, weld volume, pipe clock position, F#/P# reference, hardness conversion, alloy/PMI reference, unit and temperature conversion ACCEPTANCE CRITERIA + INDICATION EVALUATION Pick the code, edition, pipe size and wall thickness and get the tolerance for each anomaly type computed for your actual wall — with a real reference radiograph on the rows that have one. The API 1104 engine evaluates an indication against the individual-length, worst-12-inch aggregate and percent-of-weld-length tests and tells you which one it fails. FILM INTERPRETATION WITH REAL RADIOGRAPHS Ten defect categories — incomplete penetration, IP due to high-low, elongated slag, porosity, cracks, burn through, hollow bead, internal and external undercut, incomplete fusion — each with real annotated films you can pinch-zoom, plus what it looks like on film and how it is graded. REFERENCE LIBRARY API 510, API 570, API 653, API 571 damage mechanisms, WPS/PQR to ASME IX, PT and UT code guides, PMI guide, CUI/coating and electrode storage — written in our own words from the governing standards and cited, never copied. EXAM PREP — 750 QUESTIONS • State card / radiation safety — 200 questions plus study notes and a timed mock on the real blueprint • CWI — 351 questions plus bullet study cards • ASNT Level II — 199 questions across UT, RT, MT, PT and ET Every answer comes with the explanation and the standard behind it. BUILT FOR THE FIELD • Fully offline — no signal needed at the shot • Big-screen mode: mirror your phone to a TV or monitor over AirPlay or HDMI for a film-density readout the whole crew can read across the bay • Customizable home — pin the tools you use, most-used surface automatically • Dark, one-hand interface that reads in bright sun or a dark bay Every formula is built from the governing standard — ASME, API, AWS, ASTM, ASNT, NCRP — and cited, not copied from another app. Reference only. This app does not replace your governing code, your written procedure or certified personnel. Radiation safety outputs are planning aids: always verify with a calibrated survey meter and follow your radiation safety program.