prEN ISO 6338-2

Calculations of greenhouse gas (GHG) emissions throughout the liquefied natural gas (LNG) chain - Part 2: Natural gas production and transport to LNG plant (ISO 6338-2:2024)

This document provides a method to calculate the greenhouse gas (GHG) emissions during natural gas production (onshore or offshore), gas processing and gas transport to liquefied natural gas (LNG) liquefaction plant.
NOTE          It can be applied to other gases as biogas or non-traditional types of natural gas.
This document covers all facilities associated with producing natural gas, including:
—     drilling (exploration, appraisal, and development) and production wells;
—     gas gathering network and boosting stations (if any);
—     gas processing facilities (if any), transport gas pipelines with compression stations (if any) up to inlet valve of LNG liquefaction plant.
This document covers facilities associated with producing other products (such as, but not limited to, domestic gas, condensate, Liquefied Petroleum Gas (LPG), sulphur, power export) to the extent required to allocate GHG emissions to each product.
This document covers the upstream facilities “under operation”, including emissions associated with commissioning, initial start-up and restarts after maintenance or upset. This document does not cover the exploration, construction and decommissioning phases or the losses from vegetation coverage.
This document covers all GHG emissions associated with production, process and transport of natural gas to the LNG liquefaction plant. These emissions spread across scope 1, scope 2 and scope 3 of the responsible organization, as defined in ISO 6338-1. All emissions sources are covered including flaring, combustion, cold vents, process vents, fugitive leaks and emissions associated with imported energy. Gases covered include CO2, CH4, N2O and fluorinated gases.
This document does not cover compensation.
This document defines preferred units of measurement and necessary conversions.
This document also recommends instrumentation and estimations methods to monitor and report GHG emissions. Some emissions are measured; and some are estimated.

Berechnungsverfahren der Treibhausgasemissionen (THG) in der gesamten Flüssigerdgas-(LNG-)Kette - Teil 2: Erdgasförderung und Transport zur LNG-Anlage (ISO 6338-2:2024)

Calcul des émissions de gaz à effet de serre (GES) dans la chaîne gaz naturel liquéfié (GNL) - Partie 2: Production du gaz naturel et transport à l’usine GNL (ISO 6338-2:2024)

Le présent document fournit une méthode pour calculer les émissions de GES pendant la production de gaz naturel (à terre ou en mer), le traitement du gaz et le transport du gaz vers une usine de liquéfaction de GNL.
NOTE          Cette méthode peut être appliquée à d'autres gaz tels que le biogaz ou des types de gaz naturel non traditionnels.
Le document couvre toutes les installations associées à la production de gaz naturel, y compris:
—     forage (exploration, évaluation et développement) et puits de production;
—     réseau de collecte de gaz et stations de surpression (le cas échéant);
—     installations de traitement du gaz (le cas échéant), canalisations de transport avec stations de compression (le cas échéant).
Le présent document couvre les installations naturelles associées à la production d'autres produits (tels que le gaz domestique, le condensat, le GPL, le soufre, l'exportation d'électricité, sans toutefois s'y limiter) afin de pouvoir allouer les émissions de GES à chaque produit.
Le présent document couvre les installations en amont “en cours d'exploitation”, y compris les émissions associées à la mise en service, au démarrage initial et aux redémarrages après maintenance ou perturbation. Il ne couvre pas les phases d'exploration, de construction et de mise hors service, ni les pertes dues à la couverture végétale.
Le présent document couvre toutes les émissions de GES associées à la production, au traitement et au transport du gaz naturel vers l'usine de liquéfaction de GNL. Ces émissions se répartissent entre la catégorie 1, la catégorie 2 et la catégorie 3 de l'organisme responsable, comme défini dans l’ISO 6338-1.  Toutes les sources d'émission sont couvertes, y compris le torchage, la combustion, les évents froids, les évents de procédé, les fuites fugitives et les émissions associées à l'énergie importée. Les gaz à prendre en compte sont le CO2, le CH4, le N2O et les gaz fluorés.
Le présent document ne couvre pas la compensation.
Le présent document définit les unités de mesure privilégiées et les conversions nécessaires.
Ce document recommande également l'instrumentation et les méthodes d'estimation pour surveiller et déclarer les émissions de GES. Certaines émissions sont mesurées et d'autres estimées.

Izračuni emisij toplogrednih plinov v oskrbovalni verigi z utekočinjenim zemeljskim plinom (LNG) - 2. del: Proizvodnja zemeljskega plina in transport do obrata za utekočinjanje zemeljskega plina (ISO 6338-2:2024)

Ta dokument določa metodo za izračun emisij toplogrednih plinov (GHG) med proizvodnjo zemeljskega plina (na kopnem ali na morju), predelavo plina in transportom plina do obrata za utekočinjanje zemeljskega plina (LNG).
OPOMBA          Uporablja se lahko tudi za druge pline, kot so bioplin ali netradicionalne vrste zemeljskega plina.
Ta dokument zajema vse objekte, povezane s proizvodnjo zemeljskega plina, vključno z:
- vrtanjem (raziskovanje, ocenjevanje in razvoj) in proizvodnimi vrtinami;
- omrežjem za zbiranje plina in ojačevalnimi postajami (če obstajajo);
- objekti za predelavo plina (če obstajajo), transportnimi plinovodi s kompresorskimi postajami (če obstajajo) do vstopnega ventila obrata za utekočinjanje LNG.
Ta dokument zajema objekte, povezane s proizvodnjo drugih proizvodov (kot so, vendar ne omejeno na, gospodinjski plin, kondenzat, utekočinjen naftni plin (LPG), žveplo, izvoz električne energije) v obsegu, potrebnem za dodelitev emisij GHG vsakemu proizvodu.
Ta dokument zajema zgornje objekte "v obratovanju", vključno z emisijami, povezanimi z zagonom, začetnim zagonom in ponovnimi zagoni po vzdrževanju ali motnjah. Ta dokument ne zajema faz raziskovanja, gradnje in razgradnje ali izgub zaradi vegetacijske pokritosti.
Ta dokument zajema vse emisije GHG, povezane s proizvodnjo, procesom in transportom zemeljskega plina do obrata za utekočinjanje LNG. Te emisije se razprostirajo čez obseg 1, obseg 2 in obseg 3 odgovorne organizacije, kot je opredeljeno v ISO 6338-1. Zajeti so vsi viri emisij, vključno z baklami, zgorevanjem, hladnimi izpuhi, procesnimi izpuhi, uhajanjem in emisijami, povezanimi z uvoženo energijo. Zajeti plini vključujejo CO2, CH4, N2O in fluorirane pline.
Ta dokument ne zajema kompenzacije.
Ta dokument določa prednostne merske enote in potrebne pretvorbe.
Ta dokument prav tako priporoča instrumentacijo in metode ocenjevanja za spremljanje in poročanje o emisijah GHG. Nekatere emisije so merjene; nekatere so ocenjene.

General Information

• Status: Not Published
• Publication Date: 20-Aug-2028
• ICS: 13.020.40 - Pollution, pollution control and conservation
• ICS: 75.020 - Extraction and processing of petroleum and natural gas
• Technical Committee: CEN/TC 282 - Installation and equipment for LNG
• Drafting Committee: CEN/TC 282 - Installation and equipment for LNG
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 26-Mar-2026
• Due Date: 19-Feb-2027
• Completion Date: 26-Mar-2026
• Ref Project: oSIST prEN ISO 6338-2:2026 - Calculations of greenhouse gas (GHG) emissions throughout the liquefied natural gas (LNG) chain - Part 2: Natural gas production and transport to LNG plant (ISO 6338-2:2024)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Izračuni emisij toplogrednih plinov v oskrbovalni verigi z utekočinjenim
zemeljskim plinom (LNG) - 2. del: Proizvodnja zemeljskega plina in transport do
obrata za utekočinjanje zemeljskega plina (ISO 6338-2:2024)
Calculations of greenhouse gas (GHG) emissions throughout the liquefied natural gas
(LNG) chain - Part 2: Natural gas production and transport to LNG plant (ISO 6338-
2:2024)
Berechnungsverfahren der Treibhausgasemissionen (THG) in der gesamten
Flüssigerdgas-(LNG-)Kette - Teil 2: Erdgasförderung und Transport zur LNG-Anlage
(ISO 6338-2:2024)
Calcul des émissions de gaz à effet de serre (GES) dans la chaîne gaz naturel liquéfié
(GNL) - Partie 2: Production du gaz naturel et transport à l’usine GNL (ISO 6338-2:2024)
Ta slovenski standard je istoveten z: prEN ISO 6338-2
ICS:
13.020.40 Onesnaževanje, nadzor nad Pollution, pollution control
onesnaževanjem in and conservation
ohranjanje
75.020 Pridobivanje in predelava Extraction and processing of
nafte in zemeljskega plina petroleum and natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International
Standard
ISO 6338-2
First edition
Calculations of greenhouse gas
2024-08
(GHG) emissions throughout the
liquefied natural gas (LNG) chain —
Part 2:
Natural gas production and
transport to LNG plant
Calcul des émissions de gaz à effet de serre (GES) dans la chaîne
gaz naturel liquéfié (GNL) —
Partie 2: Production du gaz naturel et transport à l’usine GNL
Reference number
ISO 6338-2:2024(en) © ISO 2024

ISO 6338-2:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 6338-2:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principles . 2
5 GHG inventory boundaries . 2
6 Quantification of GHG emissions . 3
6.1 General .3
6.2 Defining the upstream system .3
6.2.1 General .3
6.2.2 Gas production feeding LNG liquefaction directly .3
6.2.3 Oil production with associated gas feeding LNG liquefaction .3
6.2.4 LNG liquefaction fed from gas grid .4
6.2.5 LNG liquefaction supplied with non-fossil feed .4
6.3 Identification of GHG sources and quantification approach .5
6.3.1 General .5
6.3.2 Emissions from fuel combustion . .5
6.3.3 Emissions from flaring and venting .5
6.3.4 Fugitive emissions .6
6.3.5 Emissions associated with imported energy, utilities, and consumables .6
6.4 Calculation of GHG emissions .7
6.5 Preferred units .7
6.6 Allocation .7
6.7 Carbon capture .8
7 GHG inventory quality management . 8
8 GHG reporting . 8
9 Independent review . . 8
Bibliography . 9

iii
ISO 6338-2:2024(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 document 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 ISO/TC 67, Oil and gas industries including lower carbon
energy, Subcommittee SC 9, Production, transport and storage facilities for cryogenic liquefied gases.
A list of all parts in the ISO 6338 series can be found on the ISO website.
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 6338-2:2024(en)
Introduction
Natural gas will play a key role in the energy transition (e.g. by replacing coal to produce electricity) and the
use of liquefied natural gas (LNG) to transport natural gas is expected to increase. The process of liquefying
natural gas is energy-intensive. Gas producers are increasingly accountable for their greenhouse gas (GHG)
emissions and the ambition to reduce them. Furthermore, there is an emerging marketing demand for GHG
data to enable commercial mechanisms such as offsetting to be utilized.
There is no standardized and auditable methodology to calculate the carbon footprint of the whole LNG
chain (including but not limited to the well, upstream treatment, transportation, liquefaction, shipping,
regasification and end user distribution). Various standards indicate possible approaches but are
inconsistent in their results or not easily applicable.
The ISO 6338 series covers each part of the LNG chain and enables a consistent GHG inventory.
The KPIs and related requirements to access to key international initiatives, agreements and reporting/
accounting standards on climate ambitions and zero carbon emission strategies are given in ISO 6338-1:2024,
Annex B.
Attention should be paid to activities that can occur in different parts (e.g. gas treatment and distribution
upstream of the liquefaction plant).
NOTE It is not possible to make like-for-like comparisons, or define a certification scheme, for one block only.

v
International Standard ISO 6338-2:2024(en)
Calculations of greenhouse gas (GHG) emissions throughout
the liquefied natural gas (LNG) chain —
Part 2:
Natural gas production and transport to LNG plant
1 Scope
This document provides a method to calculate the greenhouse gas (GHG) emissions during natural
gas production (onshore or offshore), gas processing and gas transport to liquefied natural gas (LNG)
liquefaction plant.
NOTE It can be applied to other gases as biogas or non-traditional types of natural gas.
This document covers all facilities associated with producing natural gas, including:
— drilling (exploration, appraisal, and development) and production wells;
— gas gathering network and boosting stations (if any);
— gas processing facilities (if any), transport gas pipelines with compression stations (if any) up to inlet
valve of LNG liquefaction plant.
This document covers facilities associated with producing other products (such as, but not limited to,
domestic gas, condensate, Liquefied Petroleum Gas (LPG), sulphur, power export) to the extent required to
allocate GHG emissions to each product.
This document covers the upstream facilities “under operation”, including emissions associated with
commissioning, initial start-up and restarts after maintenance or upset. This document does not cover the
exploration, construction and decommissioning phases or the losses from vegetation coverage.
This document covers all GHG emissions associated with production, process and transport of natural gas
to the LNG liquefaction plant. These emissions spread across scope 1, scope 2 and scope 3 of the responsible
organization, as defined in ISO 6338-1. All emissions sources are covered including flaring, combustion, cold
vents, process vents, fugitive leaks and emissions associated with imported energy. Gases covered include
CO , CH , N O and fluorinated gases.
2 4 2
This document does not cover compensation.
This document defines preferred units of measurement and necessary conversions.
This document also recommends instrumentation and estimations methods to monitor and report GHG
emissions. Some emissions are measured; and some are estimated.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6338-1, Calculations of greenhouse gas (GHG) emissions throughout the liquefied natural gas (LNG) chain —
Part 1: General
ISO 14044, Environmental management — Life cycle assessment — Requirements and guidelines

ISO 6338-2:2024(en)
ISO 14064-1, Greenhouse gases — Part 1: Specification with guidance at the organization level for quantification
and reporting of greenhouse gas emissions and removals
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14064-1 and ISO 6338-1 apply.
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/
4 Principles
The principles given in ISO 6338-1 shall be followed.
5 GHG inventory boundaries
The GHG report for an onshore or offshore plant for the production, processing and conditioning of natural
gases (NG) to be used as LNG shall cover all facilities which are associated to produce LNG. The list in Table 1
is not exhaustive.
Table 1 — List of facilities within the scope of this document
NG production, processing and conditioning
In scope Out of scope
plant facility
Natural gas production wells X
Natural gas gathering system X
Slugcatchers and condensate removal facilities X
Sour gases removal units X
Merc
...