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Gas Sampling Calculator

Per GPA 2166 & API MPMS Chapter 14.1

GPA 2166 / API 14.1 Gas Sampling Calculator
Calculates purge volumes, cylinder fill parameters, Joule-Thomson cooling estimates, and phase envelope checks for spot sampling. Determines grab volumes, fill ratios, and trigger settings for composite sampling per GPA 2166 and API MPMS Chapter 14.1.
Sampling Mode:

Pipeline Conditions

psig
°F
-
Natural gas: 0.55-0.80
in
8" NPS Sch 40 = 7.981"

Sample Cylinder

psig

Sampling Method

SCFH
Typical: 2-10 SCFH through sample tubing
min
Min 3 minutes per GPA 2166

๐Ÿ“š Learn the Theory

Understand GPA 2166, API 14.1 sampling procedures, cylinder types, and phase considerations

Read Engineering Guide →

Purge Volume Equation

V_purge = N × V_cyl × (P_cyl / P_std) × (T_std / T_cyl)
N = Number of purge cycles (min 3)
V_cyl = Cylinder volume
P_cyl = Cylinder fill pressure
ΔT_JT = μ_JT × ΔP (~7°F per 100 psi)

Standards & References

  • GPA 2166
    Obtaining Natural Gas Samples for Analysis by Gas Chromatography
  • API MPMS Ch. 14.1
    Collecting and Handling Gas Samples for Custody Transfer
  • ISO 10715
    Natural Gas — Sampling Guidelines

Frequently Asked Questions

What standards does this gas sampling calculator follow?

It follows GPA 2166 and API MPMS Chapter 14.1 for natural gas sampling requirements.

What sampling methods does this calculator support?

It supports both spot sampling and composite sampling methods for natural gas per GPA 2166 and API 14.1.

Why is proper gas sampling important?

Accurate gas sampling is critical for determining gas composition, heating value, and quality for custody transfer and contract compliance.

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