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
Pipeline Conditions
psig
°F
-
Natural gas: 0.55-0.80
in
Composite Parameters
hours
grabs
Typically 1 grab per hour minimum
cc
Typical: 10-50 cc per grab
cc
Flow Proportional
MMSCFD
MMSCFD
Flow-proportional preferred for custody transfer
📚 Learn the Theory
Understand GPA 2166, API 14.1 sampling procedures, cylinder types, and phase considerations