Pipeline Calculator App for
Oil & Gas Professionals
HydroTech Pocket Engineer is a free iOS app built for pipeline technicians, field engineers, and project managers. Calculate pressure, volume, flow rates, nitrogen fill requirements, and hydrotest specs — all from your phone, all offline, all in seconds.
Free • iOS • No subscription
Built for the Field
The Pipeline & Nitrogen Calculator
That Lives in Your Pocket
Built by oil and gas professionals who were tired of spreadsheets and laptop-dependent tools in the field. HydroTech Pocket Engineer runs completely offline on your iPhone — no signal required, no login, no hassle.
Pressure & Volume Calculators — Internal volume, hydrotest pressure, pressure at depth, and fill volume calculations for any pipeline spec.
Nitrogen Fill & Purge Calculators — Calculate nitrogen volumes required to purge, inert, or pressure-test a pipeline segment. Input pipe OD, wall thickness, and length.
Flow Rate Calculations — Gas flow rates, velocity calculations, and pressure drop estimates for common pipeline configurations.
Hydrotest Requirements — Minimum test pressure calculations per ASME B31.4 and B31.8 for liquid and gas pipelines.
100% Offline — All calculations are local to your device. Works in remote field locations, inside pipe yards, and underground — anywhere you can take your phone.
Who Uses It
Built for Everyone Who Works
on a Pipeline
Whether you are a nitrogen service technician, commissioning engineer, inspection contractor, or project manager, HydroTech Pocket Engineer eliminates the calculation errors that slow jobs down and create paperwork problems.
Nitrogen Service Technicians
Calculate fill volumes and purge requirements before you mobilize. Confirm hydrotest pressures on-site. No more calling the office for numbers.
Pipeline Commissioning Engineers
Verify calculations in the field against your commissioning package. Quickly check pressure specs and gas volumes during startup sequences.
Inspection Contractors
Verify hydrotest pressures and minimum test durations per code. Cross-check contractor-submitted calculations on the spot.
Project Managers
Estimate nitrogen quantities and costs during project planning. Sanity-check vendor proposals before signing work orders.
Engineering Students & Trainees
Learn pipeline hydraulics through hands-on calculation. The app shows the formulas and units so you understand the math — not just the answer.
Construction Superintendents
Coordinate with your nitrogen and hydro crews using real numbers from a shared tool. Everyone on site uses the same calculations.
FAQ
HydroTech Pocket Engineer Questions
Is this app free?
Yes. HydroTech Pocket Engineer is completely free on the Apple App Store. No subscriptions, no in-app purchases, no premium tiers. Download it and use every feature immediately.
What calculators are included in the pipeline calculator app?
The current version includes pipeline internal volume calculation, hydrotest minimum test pressure (per ASME B31.4 and B31.8), nitrogen fill volume estimation, pressure at elevation, and gas flow rate calculators. Additional calculators are added with each app update.
Does the nitrogen calculator app work offline?
Yes. Every calculation is performed locally on your device. There is no server dependency, no login requirement, and no internet connection needed. It works in the most remote field locations.
Is this an oil and gas calculator app or just for pipelines?
While the initial focus is pipeline and nitrogen field calculations, the app is useful across oil and gas operations including gathering systems, processing facilities, compressor stations, and well sites. Expanded oilfield calculation modules are in development.
Is an Android version available?
Currently HydroTech Pocket Engineer is available on iOS only. An Android version is planned. Follow NitroTech on social media or check back here for updates on the Android release.
Download the Free Pipeline Calculator.
Or Let Us Do the Work for You.
HydroTech Pocket Engineer handles the math. For the nitrogen itself — purging, drying, pressure testing, or inerting — NitroTech is ready to mobilize coast to coast.
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