ASTM D4150-00
(Terminology)Standard Terminology Relating to Gaseous Fuels
Standard Terminology Relating to Gaseous Fuels
SCOPE
1.1 This standard defines the terms used in standards that are the responsiblity of Committee D-3 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.
General Information
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Standards Content (Sample)
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Designation:D4150–00
Standard Terminology Relating to
Gaseous Fuels
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 to condense from a gas mixture (water dew point), or at
which hydrocarbons start to condense (hydrocarbon dew
1.1 This standard defines the terms used in standards that
point).
are the responsiblity of Committee D-3 on Gaseous Fuels.
dissolved gas—natural gas held in solution in reservoir liquids
These terms are used in:
at the prevailing temperature and pressure of the reservoir.
1.1.1 The sampling of gaseous fuels,
dry gas—natural gas containing little or no water vapor.
1.1.2 The analysis of gaseous fuels for composition and
hydrate—a solid, crystalline material composed of water and
various other physical properties, and
components of natural gas formed under pressure at tem-
1.1.3 Otherpracticesrelatedtotheprocessing,transmission,
peratures above the freezing point of water.
and distribution of gaseous fuels.
hydrocarbon dew point—(see dew point)
2. Referenced Documents
inert components—those elements or components of natural
gas (fuel gas) that do not contribute to the heating value.
2.1 ISO Standard:
lean gas—natural gas containing little or no hydrocarbons
ISO NP 14532 Natural Gas—Terminology
commercially recoverable as liquid products.
3. Terminology
DISCUSSION—Water and recoverable hydrocarbons (ethane and
heavier hydrocarbons) are customarily removed from natural gas to
acid gas—natural gas containing high concentrations of hy-
meet contractual or state statutory requirements.
drogen sulfide or carbon dioxide, or both, which is acidic
when in contact with water or water vapor.
liquefied natural gas (LNG)—natural gas that has been
associated gas—natural gas, also known as gas-cap gas or
liquefied, after processing, for storage or transportation
dome gas, that overlies and is in immediate contact, but not
purposes. (This definition is from ISO NP 14532.)
in solution, with crude oil in a reservoir.
natural gas—a naturally occurring mixture of hydrocarbon
base conditions—temperature and pressure conditions at
and nonhydrocarbon gases found in porous geological for-
which natural gas volumes are determined for purposes of
mations (reservoirs) beneath the earth’s surface, often in
custody transfer. In natural gas measurement the properties
association with petroleum. The principal constituent of
of interest are temperature, pressure, and composition. As-
natural gas is methane.
suming ideal gas properties, for simplicity, tables of pure
natural gas odorant—an intensively smelling organic chemi-
compounds can be prepared for use in calculating gas
cal or combination of chemicals (for example, sulfur com-
properties for any composition at 88base conditions.” These
pounds), added to fuel gases to impart a characteristic and
88base conditions” are chosen near ambient.
distinctive (usually disagreeable) warning odor so gas leaks
compressed natural gas (CNG)—natural gas that is typically
can be detected.
pressurized to 3600 psi. CNG is primarily us
...
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