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N₂

Nitrogen Pressure Test Calculator

Pneumatic Testing · Bottle Requirements · ASME B31.8

Nitrogen Pressure Test Calculator
Calculates nitrogen cylinder/pack requirements for pneumatic pressure testing of pipelines and vessels per ASME B31.8 and 49 CFR Part 192. Includes real gas compressibility, temperature corrections, and recommended hold times.

Calculation Mode

Pipe Specifications

feet
inches

Test Parameters

psig
°F
°F

Without a booster, cylinders only empty down to the test pressure, so each delivers much less gas.

Engineering Notes:
  • Calculations use real gas law with N₂ compressibility factor (Z)
  • 10% safety factor applied for operational losses and leakage
  • Bottles drawn down to 100 psig through a booster, or only to the test pressure for a direct fill; cylinder contents use real-gas N₂ Z from NIST data
  • Recommended hold times based on pipe diameter (49 CFR 192 min: 1 hr)
  • For volumes >50,000 SCF, consider tube trailer delivery

Learn the Theory

Comprehensive coverage of nitrogen pressure testing per ASME B31.8, test pressures, temperature corrections, and leak detection.

Read Engineering Guide →

About This Calculator

Calculates nitrogen bottle or tube trailer requirements for pneumatic pressure testing of pipelines and vessels.

Industry Standards:

  • ASME B31.8: Gas transmission piping
  • 49 CFR 192: Federal pipeline safety
  • CGA G-10.1: Nitrogen specifications

Key Features:

  • Real gas compressibility (Z-factor)
  • Temperature corrections for bottles
  • Hold time recommendations
  • Multi-section pipeline support

Standard N₂ Bottle Sizes

K-Cylinder 251 SCF
T-Cylinder 330 SCF
6-Pack 1,506 SCF
12-Pack 3,012 SCF
16-Pack 4,016 SCF
Tube Trailer ~180,000 SCF

SCF = Standard Cubic Feet @ 14.696 psia, 60°F

Frequently Asked Questions

What does the nitrogen pressure test calculator compute?

It calculates nitrogen bottle requirements for pipeline pneumatic pressure testing, including temperature corrections and compressibility factors.

What standards does this N2 test calculator follow?

It follows ASME B31.8 and 49 CFR 192 for pipeline pressure testing requirements.

Does this calculator include hold time recommendations?

Yes, it includes hold time recommendations per ASME B31.8 for pneumatic pressure tests.

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