oSIST prEN ISO 14532:2025

SLOVENSKI STANDARD
01-julij-2025
Zemeljski plin - Slovar (ISO/DIS 14532:2025)
Natural gas - Vocabulary (ISO/DIS 14532:2025)
Erdgas - Terminologie (ISO/DIS 14532:2025)
Gaz naturel - Vocabulaire (ISO/DIS 14532:2025)
Ta slovenski standard je istoveten z: prEN ISO 14532
ICS:
01.040.75 Naftna in sorodna tehnologija Petroleum and related
(Slovarji) technologies (Vocabularies)
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 14532
ISO/TC 193
Natural gas — Vocabulary
Secretariat: NEN
Gaz naturel — Vocabulaire
Voting begins on:
2025-05-15
ICS: 75.060; 01.040.75
Voting terminates on:
2025-08-07
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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Reference number
ISO/DIS 14532:2025(en)
DRAFT
ISO/DIS 14532:2025(en)
International
Standard
ISO/DIS 14532
ISO/TC 193
Natural gas — Vocabulary
Secretariat: NEN
Gaz naturel — Vocabulaire
Voting begins on:
ICS: 75.060; 01.040.75
Voting terminates on:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 14532:2025(en)
ii
ISO/DIS 14532:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
Annex A (Normative) List of terms defined in ISO/IEC Guide 98-3 and ISO/IEC Guide 99 .19
Bibliography .21

iii
ISO/DIS 14532:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee 193, Natural gas.
This third edition cancels and replaces the second edition (ISO 14532:2014), which has been technically
revised.
The main changes are as follows:
— All general and well known terms that are not specific for natural gas and can be found in publicly
available sources have been deleted.
— All terms that are too specific to a certain topic in the field of natural gas have been deleted.
— Some definitions have been modified, generalized with the aim to avoid becoming too specific to a
certain topic in the field of natural gas.
— Relevant terms from all ISO/TC 193 standards published since 2014 have been added.
— All terms are listed in alphabetical order.
— The Annex containing the alphabetical index has been deleted.
— The Annex containing the indices, symbols and units has been deleted.
— An Annex containing a list of terms defined in ISO/IEC Guide 98-3:2008 Uncertainty of measurement
(GUM) or ISO/IEC Guide 99:2007 International vocabulary of metrology (VIM) has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 14532:2025(en)
Introduction
ISO/TC 193 Natural Gas has been established in May 1988, its current scope being:
— to standardize terminology, quality specifications, methods of measurement, sampling, analysis, and
testing including thermophysical property calculation and measurement, for
— natural gas
— natural gas substitutes
— mixtures of natural gas with other gaseous fuels (such as unconventional and renewable gases), and
— wet gas
in all its facets from production to delivery to all possible end users across national boundaries.
— to standardize methods of analysis of liquefied natural gas (LNG).
As the aim is to create a coherent body of standards which support each other with regard to their
definitions, common and unambiguous terms and definitions used throughout all International Standards is
the starting point for the understanding and application of every International Standard.
The definitive intention of this document is to incorporate the reviewed definitions into the ISO/TC 193
standards.
The presentation of this document has been arranged to facilitate its use as follows:
— All terms are listed in alphabetical order
— Notes are given under numerous definitions where it was deemed important to give informative guidance
for a given definition. The Notes are not considered a part of the definition.
The terms and definitions have been reviewed and studied in order to cover all aspects of any particular
term with input from other sources such as European Standards from CEN (The European Committee for
Standardization), standards from ASTM, national standards, and existing definitions in the IGU Dictionary
of the Gas Industry.
v
DRAFT International Standard ISO/DIS 14532:2025(en)
Natural gas — Vocabulary
1 Scope
This document establishes the terms and definitions, used in the field of natural gas, natural gas substitutes,
mixtures of natural gas with gaseous fuels (such as unconventional and renewable gases) and wet gas.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
absorption
retention, by physical or chemical forces of gas molecules, dissolved substances, or liquids by the bulk of
solids or liquids with which they are in contact
Note 1 to entry: The process causes (or is accompanied by) a physical or chemical change, or both, in the sorbent
material.
EXAMPLE Retention of siloxanes by charcoal.
3.2
adsorption
retention, by physical or chemical forces of gas molecules, dissolved substances, or liquids by the surface of
solids or liquids with which they are in contact
EXAMPLE Retention of methane by carbon.
[SOURCE: ISO 10715:2022, 3.2]
3.3
amount of substance fraction
amount fraction
mole fraction
quotient of amount of substance of a component and total amount of substance in the mixture
[SOURCE: ISO 80000-9, 9.13, modified. Original definition: for substance X in a mixture, quotient of amount
of substance nX of X and total amount n of substance in the mixture: X = n /n]
x x
3.4
analysis function
analyte content expressed as a function of instrumental response
[SOURCE: ISO 6143:2001]
ISO/DIS 14532:2025(en)
3.5
assigned value
value attributed to a particular property of a proficiency test item
[SOURCE: ISO 6974-3:2018, 3.11]
3.6
availability (of a measuring system or instrument)
probability, at any time, that the measuring system, or a measuring instrument forming part of the measuring
system, is functioning according to specifications
[SOURCE: ISO 15112:2018, 3.4]
3.7
biogas
gas, comprising principally methane and carbon dioxide, obtained from the anaerobic digestion of biomass
[SOURCE: EN 16723-1:2016, 3.1]
3.8
biomass
biological material from living, or recently living organisms, typically this may be plants or plant-derived
materials
[SOURCE: EN 16723-1:2016, 3.2]
3.9
biomethane
gas comprising principally methane, obtained from either upgrading of biogas or methanation of bio-syngas
[SOURCE: EN 16723-1:2016, 3.3]
3.10
bracketing
establishment of a straight-line calibration function using two calibration points defining a range
Note 1 to entry: The range is established so that the content of a component is expected to lie between the contents of
the component in the calibration gas mixtures.
3.11
bridge component
component selected to allow the combination of results for components measured by different analytical
operations
[SOURCE: ISO 6974-1:2012, 3.18, modified – ‘Bridging’ between the words ‘combination’ and ‘of’ has been
deleted.]
3.12
bubble pressure
pressure at which an infinitesimal amount of vapour is in equilibrium with a bulk liquid for a specified
temperature
[SOURCE: ISO 20765-2:2015, 3.1]
3.13
bubble temperature
temperature at which an infinitesimal amount of vapour is in equilibrium with a bulk liquid for a specified
pressure
[SOURCE: ISO 20765-2:2015, 3.2]

ISO/DIS 14532:2025(en)
3.14
calculated methane number
MN
C
numerical rating index obtained by a calculation, indicating the knock resistance of a gaseous fuel, according
to ISO 17507-1
Note 1 to entry: This analytical estimate of a methane number is based on using volume fraction gaseous fuel
composition as input.
[SOURCE: ISO/DIS 17507-1:2024, 3.2]
3.15
calibration function
instrumental response expressed as a function of analyte content
[SOURCE: ISO/DIS 6143:2024, 3.4.1]
3.16
calibration gas mixture
gas mixture of known stability and homogeneity whose composition is well established for use in the
calibration or verification of a measuring instrument or the validation of a measurement
[SOURCE: ISO 7504:2015, 5.1]
3.17
calorific value
heating value
amount of heat which would be released by the complete combustion with oxygen of a specified quantity of
gas, in such a way that the pressure at which the reaction takes place remains constant, and all the products
of combustion are returned to the same specified temperature as that of the reactants
[SOURCE: ISO 13686:2013, 3.8]
3.18
chromatographic resolution
resolution column efficiency characteristic describing the degree of separation of two adjacent peaks in the
chromatogram
Note 1 to entry: The resolution is measured as twice the distance between the maximum of the named peaks, divided
by the sum of the intercepts on the baseline made by tangents drawn to the peaks at half the height.
3.19
coal based synthetic natural gas
gaseous mixture synthesized from coal, comprising primarily methane and hydrogen, but generally also
includes ethane and some non-combustible gases such as nitrogen and carbon dioxide
[SOURCE: ISO/TR 17910:2023, 3.18]
3.20
combustion reference conditions
specified temperature and pressure at which a fuel is notionally burned
3.21
component
chemical compound
3.22
compressed natural gas
CNG
natural gas that has been compressed after processing for storage and transportation purposes
Note 1 to entry: CNG is mainly used as a fuel for vehicles, typically compressed up to 20 000 kPa in the gaseous state.

ISO/DIS 14532:2025(en)
Note 2 to entry: Usually the maximum pressure for natural gas stored in a container is 25 000 kPa.
3.23
compression factor
compressibility factor
quotient of the volume of an amount of gas at a specified pressure and temperature, and the volume of the
same amount of ideal gas at the same pressure and temperature
3.24
condenser
apparatus used to transform the condensable fraction (consisting of water vapour and/or of the higher
hydrocarbons) of the vapour phase present in natural gas into a liquid phase by cooling
3.25
contaminant
constituent in very low levels, such as particulates, glycol, compressor oil, etc., that are assumed to be
intrusive
[SOURCE: ISO 10715:2022, 3.3, modified - At the end of the definition ’and not part of the gas to be sampled’
has been deleted.]
3.26
cricondenbar
maximum pressure at which two-phase separation can occur
[SOURCE: ISO 20765-2:2015, 3.3]
3.27
cricondentherm
maximum temperature at which two-phase separation can occur
[SOURCE: ISO 20765-2:2015, 3.4]
3.28
critical point
unique saturation point along the two-phase vapour-liquid equilibrium boundary where both the vapour
and liquid phases have the same composition and density
[SOURCE: ISO 20765-2:2015, 3.5]
3.29
custody transfer point
location between two pipeline systems where the quantity of energy of the natural gas has to be accounted for
Note 1 to entry: At such location a change of pressure regime can also occur.
3.30
density
quotient of the mass of a gas and its volume
3.31
density ratio (of a fluid)
quotient of gas density and a liquid density of a fluid at line conditions
[SOURCE: ISO 12748_2015, 2.6, modified - “Ratio” has been replaced by “quotient”.]
3.32
desorption
removal of a sorbed substance by the reverse process of adsorption or absorption
[SOURCE: ISO 10715:2022, 3.4, modified; Note 1 to entry was deleted.]

ISO/DIS 14532:2025(en)
3.33
dew pressure
pressure at which an infinitesimal amount of liquid is in equilibrium with a bulk vapour for a specified
temperature
[SOURCE: ISO 20765-2:2015, 3.6]
3.34
dew temperature
temperature at which an infinitesimal amount of liquid is in equilibrium with a bulk vapour for a specified
pressure
[SOURCE: ISO 20765-2:2015, 3.7]
3.35
direct measurement (of a component content)
measurement in which the content of individual components or group of components are determined by
comparison with the content of identical components in the reference gas mixture
3.36
direct sampling
sampling in situations where there is a direct connection between the natural gas to be sampled and the
analytical unit
[SOURCE: ISO 10715:2022,3.5 ISO/TR 7262:2022, 3.3]
3.37
dry gas
gas containing a mole fraction of water and/or hydrocarbons that are not expected to condense at pipeline
conditions
Note 1 to entry: The water content and/or hydrocarbons content for dry gas are mostly defined by users or
transporters.
Note 2 to entry: The correlation between water content and water dew point is given in ISO 18453.[17]
3.38
equation of state
EoS
mathematical relationship between state variables of a gas or homogeneous gas mixture
EXAMPLE For an ideal gas, the equation of state is the ideal gas law. More complicated equations of state have
been developed to model the behaviour of actual gases over a range of pressures and temperatures, e.g. Benedict,
Webb, Rubin (BWR equation), Redlich, Kwong and Soave (RKS equation) and the GERG 2008 equation.
3.39
family of gases
gas family
group of combustible gases with similar burning behaviour linked together by a range of Wobbe indices
3.40
fast loop
sampling system that takes more sample from the process than is needed to make the measurement so as to
reduce the residence time
3.41
flash back
situation where the flame velocity exceeds that of the air gas mixture, resulting with the combustion taking
place before the burning port
Note 1 to entry: It generally results in an extinction of the flame and can damage the burner of the appliance.

ISO/DIS 14532:2025(en)
3.42
floating piston cylinder
container that has a moving piston separating the sample from a buffer gas
3.43
flow-proportional incremental sampler
sampler that collects a series of spot samples over a period of time with the spot samples taken in such a
manner as to ensure the incremental sample is proportional to the incremental totalised flow
Note 1 to entry: This is normally achieved by varying the frequency of extraction of a constant volume spot sample (grab).
3.44
gas analysis
measurement methods and techniques for determining the gas composition
[SOURCE: ISO 13686:2013, 3.17, modified - “Use of test methods” has been replaced by “measurement”, and
“other” before “techniques” has been deleted.]
3.45
gas composition
fractions or concentrations of all the components in a mixture
3.46
gas hydrates
solid crystalline substance resembling ice formed by gas molecules and water molecules
3.47
gas quality
set of attributes of a gas that characterises important aspects of its production, transportation or use
Note 1 to entry: Examples of attributes include composition, calorific value, Wobbe index, methane number, relative
density and dew points.
3.48
gas sorption effect
physical process whereby some gases are adsorbed onto or desorbed from the surfaces of a solid without
transformation of the molecules
Note 1 to entry: Note to entry: The force of attraction between some gases and solids is purely physical and depends
on the nature of the participating material. Natural gas can contain several components that exhibit strong sorption
effects. Special care should be taken when determining trace concentrations such as heavy hydrocarbons, water,
sulfur compounds, mercury and hydrogen.
[SOURCE: ISO 10715:2022, 3.7]
3.49
gas to oil ratio
ratio of gas volume flow rate to hydrocarbon liquid volume flow rate
[SOURCE: ISO/TR 12748:2015, 2.21]
3.50
gaseous fuel
fuel gas
any gaseous material that can be oxidized with the intent to release energy
Note 1 to entry: Examples of gaseous fuels include, but are not limited to, natural gas, digester gas, landfill gas, process
gas, hydrogen gas and their liquefied forms such as liquefied petroleum gas or liquefied natural gas.

ISO/DIS 14532:2025(en)
3.51
gross calorific value
superior calorific value
higher heating value
calorific value when the combustion products are in the gaseous state, except for water, which is condensed
to the liquid state
3.52
group of components
set of components whose content is measured not individually, but for the group as a whole
3.53
hot loop
sampling configuration that returns the sample to the pipeline
Note 1 to entry: The loop requires a pressure differential from collection point to discharge so as to ensure a constant
and steady flowrate through the sampling equipment located in the loop.
3.54
hydrocarbon dew temperature
hydrocarbon dew point (HCDP)
temperature at which an infinitesimal amount of liquid hydrocarbons is in equilibrium with a bulk vapour
for a specified pressure
3.55
incremental sampler
sampler that accumulates a series of spot samples into one composite sample
[SOURCE: ISO 10715:2022, 3.10]
3.56
indirect measurement (of a component)
measurement in which individual components or groups of components are determined using relative
response factors to a reference component in the reference gas mixture
3.57
indirect sampling
sampling in situations where there is no direct connection between the natural gas to be sampled and the
analytical unit
[SOURCE: ISO 10715:2022, 3.11 ISO/TR 7262:2022, 3.2]
3.58
in-line instrument
instrument whose active element is installed inside the pipeline and makes measurements under pipeline
conditions
3.59
interchangeability
characteristic of gases where one gas is compatible with another gas with regard to combustion
Note 1 to entry: Two gases are said to be interchangeable when one gas can be substituted for the other gas without
interfering with the operation of gas-burning appliances or equipment.
3.60
interference
negative or positive effect upon the response of the measuring system, due to a component of the sample
that is not the analyte
[SOURCE: ISO 2612:2023, 3.7 modified: ”measurand” is replaced by “analyte”]

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