Standard Terminology Relating to
Gaseous Fuels1

This standard is issued under the fixed designation D 4150; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This standard defines the terms used in standards that
are the responsiblity of Committee D03 on Gaseous Fuels.
These terms are used in:

1.1.1 The sampling of gaseous fuels,

1.1.2 The analysis of gaseous fuels for composition and
various other physical properties, and

1.1.3 Other practices related to the processing, transmission,
and distribution of gaseous fuels.

2. Referenced Documents

2.1 ISO Standard:
ISO NP 14532 Natural Gas—Terminology2

3. Terminology

acid gas—natural gas containing high concentrations of hydrogen sulfide or carbon dioxide, or both, which is acidic
when in contact with water or water vapor.
associated gas—natural gas, also known as gas-cap gas or
dome gas, that overlies and is in immediate contact, but not
in solution, with crude oil in a reservoir.
at-line instrument—instrument requiring operator interaction
to sample gas directly from the pipeline.
base conditions—temperature and pressure conditions at
which natural gas volumes are determined for purposes of
custody transfer. In natural gas measurement the properties
of interest are temperature, pressure, and composition. Assuming ideal gas properties, for simplicity, tables of pure
compounds can be prepared for use in calculating gas
properties for any composition at “base conditions.” These
“base conditions” are chosen near ambient.
Btu—British thermal unit, the amount of energy required to
raise the temperature of one pound of water one degree

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