Plant Calculator
A calculator built for plant inspection engineers

Nameplate numbers,
as-is.

kg/cm²G or psi — type it exactly as it reads and the app handles the conversion. Pick the nominal size, and OD and wall thickness fill themselves in. Built to keep working deep inside a vessel where there's no signal — an inspection calculator for the field.

ASME / JIS supported 15 categories · 65 units Works offline 8 languages
114.30
What it does

Answer “wait, what was that number?” on the spot.

Start with Quick Check, then drill into the detailed calculations.

“Is it OK right now?”
Just enter NPS, schedule, current thickness and years in service — and see original thickness, required thickness, corrosion rate, remaining life and thickness margin together.
Quick Check
“What's the ID of 4-inch Sch 80?”
Pick the nominal size and get OD, wall thickness for each schedule, ID, internal volume and pipe weight at a glance.
NPS lookup · ASME ⇄ JIS
“What thickness do I need at this pressure?”
Choose JIS / ASME / B31.3; the material database interpolates allowable stress by temperature. Diameter auto-fills from NPS, and history is saved.
Required thickness (internal pressure)
“How many years are left?”
Compute corrosion rate and remaining life from previous and current thickness readings. Supports a manufacturing-tolerance allowance (original × factor).
Corrosion rate · remaining life
Features

Inspection calculations, all covered.

Every calculation you need, gathered into a single app.

Quick Check

From NPS, schedule, material, pressure, current thickness and years in service: original thickness, required thickness, corrosion rate, remaining life and margin — all at once.

Required thickness (internal pressure)

JIS B8265 / ASME Sec.VIII / ASME B31.3. Material DB interpolates allowable stress by temperature. Diameter auto-fills from NPS. History and CSV export.

Corrosion rate · remaining life

Evaluate wall loss from measured thickness. Supports a manufacturing-tolerance allowance (original × factor). Flags thickness gain and already-deficient cases.

Thickness check

Organize average, minimum and scatter from multiple thickness readings. Clear, simple screening for general and local metal loss.

NPS lookup

ASME B36.10M/B36.19M ⇄ JIS. OD, wall, ID, internal volume and pipe weight — all at once.

Vessel & piping calculations

External-pressure buckling, nozzle reinforcement, relief valves (API 520), piping (thermal expansion / span / pressure drop / velocity), vessels (flange / torque / flat head / cone / legs).

Self-supporting towers

Combines internal pressure, dead weight, wind and seismic (static seismic coefficient method) to check tension and compression in both operating and shutdown cases. Indicative required thickness, down to the skirt.

Surface area · paint / insulation take-off

Straight pipe, elbows, heads and reducers. Enter the counts and the insulation thickness to get cladding area and indicative material quantities.

Scientific calculator & equation solver

Trig, log, powers, √, memory, EE, DEG/RAD. Solve simultaneous equations in x, y and z right there on the spot.

Also includes tanks / line totals / pipe dimension lookup / flange rating check / material list / glossary · 8 languages · Light / Dark (follows system)
Units

15 categories, 65 units.
And they switch inside the input field.

No need to open a converter — change units on the fly while you calculate. Multiplication and division keep their units too (200 mm × 200 mm = 0.04 m²).

LengthAreaVolumeTemperature PressureMassForceTorque FlowVelocityEnergyPowerAngle TimeDensity
Pressure in MPa / kPa / bar / kgf/cm² / psi / atm · Set the units you use most as defaults in Settings
Codes

JIS, ASME, API.

Built around the codes you reference in the field. All outputs are reference values — please cross-check against official calculation sheets before use.

JIS B8265JIS B36 seriesASME Sec.VIII ASME B31.3ASME B36.10M/B36.19MASME B16.5 Thickness quick-checkAPI 520
Results from this app are based on reference values and simplified formulas. For formal design and inspection decisions, always cross-check against official calculation sheets and the applicable codes (JIS / ASME / API, etc.) before use.

Field inspection math, in your pocket.

Download on the App Store