SIST EN 16726:2025

Gas infrastructure - Quality of gas - Group H

This European standard specifies gas quality characteristics, parameters and their limits, for gases classified as group H that are to be transmitted, injected into and from storages, distributed and utilized.
NOTE   For information on gas families and gas groups see EN 437.
This European standard does not cover gases conveyed on isolated networks.
For biomethane, additional requirements indicated in prEN 16723 1 apply.

Gasinfrastruktur - Beschaffenheit von Gas - Gruppe H

Dieses Dokument legt die Kenngrößen und Parameter, sowie die zugehörigen Grenzwerte für die Beschaffenheit von als Gruppe H eingeteilten Gasen fest, die zu transportieren, in Speicher ein  und aus Speichern auszuspeisen, zu verteilen und zu verbrauchen sind.
ANMERKUNG   Für Informationen zu Gasfamilien und Gasgruppen, siehe EN 437.
Diese Norm umfasst keine Gase, die in isolierten Netzen befördert werden.
Für Biomethan gelten die zusätzlichen Anforderungen von EN 16723 1.

Infrastructures gazières - Qualité du gaz - Groupe H

Le présent document spécifie les caractéristiques et les paramètres de qualité des gaz ainsi que leurs limites, pour des gaz classés dans le groupe H qui sont destinés à être transportés, injectés dans et depuis les stockages, distribués et utilisés.
NOTE   Pour en savoir plus sur les familles de gaz et groupes de gaz, voir l’EN 437.
Le présent document ne couvre pas les gaz acheminés par des réseaux isolés.
Pour les exigences spécifiques applicables au biométhane, il est fait référence à l’EN 16723-1.

Infrastruktura za plin - Kakovost plina - Skupina H

General Information

• Status: Published
• Public Enquiry End Date: 02-Aug-2025
• Publication Date: 23-Nov-2025
• ICS: 75.060 - Natural gas
• Technical Committee: DPL - Gas supply
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Nov-2025
• Due Date: 11-Jan-2026
• Completion Date: 24-Nov-2025
• Mandate: M/400 - Mandate to CEN for Standardisation in the field of gas qualities
• Ref Project: EN 16726:2025 - Gas infrastructure - Quality of gas - Group H

Relations

• Replaces: SIST EN 16726:2016+A1:2018 - Gas infrastructure - Quality of gas - Group H
• Effective Date: 01-Dec-2025

Standards Content (Sample)

SL O V EN S K I SIST EN 16726
S T ANDAR D
december 2025
Infrastruktura za plin – Kakovost plina – Skupina H
Gas infrastructure – Quality of gas – Group H
Infrastructures gazières – Qualité du gaz – Groupe H
Gasinfrastruktur – Beschaffenheit von Gas – Gruppe H
Referenčna oznaka
ICS 75.060 SIST EN 16726:2025 ((sl)en)
Nadaljevanje na straneh od II do IV in od 1 do 99
© 2025-12 Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 16726 : 2025
NACIONALNI UVOD
Standard SIST EN 16726 ((sl)en), Infrastruktura za plin – Kakovost plina – Skupina H, 2025, ima status
slovenskega standarda in je po metodi ponatisa izvirnika z nacionalnim dodatkom privzet evropski
standard EN 16726 (en), Gas infrastructure – Quality of gas – Group H, 2025.

Ta slovenski standard nadomešča slovenski standard SIST EN 16726:2016+A1:2018.

NACIONALNI PREDGOVOR
Evropski standard EN 16726 je pripravil tehnični odbor Evropskega komiteja za standardizacijo CEN/TC
234 »Infrastruktura za plin«, katerega sekretariat vodi DIN.

Ta dokument je bil pripravljen na podlagi mandata M/400, ki ga je Evropska komisija dodelila CEN in ga
je pozneje potrdilo tudi Evropsko združenje za prosto trgovino. V skladu z zahtevo iz leta 2007 in novejšimi
podnebnimi politikami Evropske unije (EU) je njegov cilj, ob upoštevanju razumnih stroškov, pripraviti
obširne specifikacije, ki bodo omogočile prost pretok plina na notranjem trgu EU. S tem bi spodbudili
konkurenčnost, omogočili zanesljivost oskrbe ter zmanjšali negativne vplive na plinsko infrastrukturo,
plinska omrežja in okolje ter povečali učinkovitost in uporabo naprav brez ogrožanja varnosti.

Odločitev za izdajo tega standarda je 20. novembra 2025 sprejel tehnični odbor SIST/TC DPL Oskrba
s plinom.
NACIONALNI DODATEK
Dodatek H
(informativni)
Žveplo
Podatki o žveplu so navedeni v informativnem dodatku H.

Podatek za Slovenijo (SI) se doda v preglednico H.1.

II
SIST EN 16726 : 2025
Preglednica H.1: Odoriranje zemeljskega plina v Evropi – Koncentracija odorantov

Država Odorant Odstotek Najnižja Najvišja Običajna Enota Neodoriran Solne Oplaščene Vodonosniki Opuščena
porabe koncentracija koncentracija koncentracija plin kaverne kaverne plinska
(mg/m³)
polja
(mg/m³) (mg/m³) (mg/m³)
SI THT 99 % 10 30 15 do 18 industrija:
– steklarska
druga < 1 _ _
normni – keramična
odorantna
zmes pogoji
ne ne ne ne
– kemična
odorant 8 11 do 15
< 1
– energetska
brez
postrojenja
žvepla
Pomen okrajšav v preglednici H.1:

DMS dimetil sulfid
EA etilakrilat
EM etilmerkaptan
IPM izopropil merkaptan
LPG utekočinjeni naftni plin (UNP)
NPM n-propilmerkaptan
MES etilmetilsulfid
THT tetrahidrotiofen
TBM terc-butil merkaptan (t-BuSH)

III
SIST EN 16726 : 2025
ZVEZE Z NACIONALNIMI STANDARDI
S privzemom tega evropskega standarda veljajo za omejeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen standardov, ki so že sprejeti v nacionalno standardizacijo:
SIST EN ISO 13443 Zemeljski plin – Standardni referenčni pogoji (ISO 13443)
SIST EN ISO 14532 Zemeljski plin – Slovar (ISO 14532)
SIST EN ISO 14912 Analiza plinov – Pretvorba podatkov o sestavi plinskih zmesi (ISO
14912)
OSNOVA ZA IZDAJO
– privzem standarda EN 16726:2025

PREDHODNE IZDAJE
– SIST EN 16726:2016
– SIST EN 16726:2016+A1:2018
OPOMBE
– Povsod, kjer se v besedilu standarda uporablja izraz “evropski standard”, v
– Ta nacionalni dokument je istoveten EN 16726:2025 in je objavljen z dovoljenjem
Upravni center
CEN-CENELEC
Rue de la Science 23
B-1040 Bruselj
– This national document is identical with EN 16726:2025 and is published with the permission of
CEN-CENELEC
Management Centre
Rue de la Science 23
B-1040 Brussels
IV
EN 16726
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 75.060 Supersedes EN 16726:2015+A1:2018
English Version
Gas infrastructure - Quality of gas - Group H
Infrastructures gazières - Qualité du gaz - Groupe H Gasinfrastruktur - Beschaffenheit von Gas - Gruppe H
This European Standard was approved by CEN on 20 July 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16726:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Reference conditions and pressure units . 11
5 Requirements . 11
5.1 Requirements to the gas quality . 11
5.2 Entry point Wobbe index range (recommendation) . 14
5.3 Exit point Wobbe index classification . 15
5.4 Effects of the injection of hydrogen onto gas quality . 19
5.5 Sampling . 19
Annex A (normative) Calculation of methane number of gaseous fuels for engines . 20
A.1 Introduction . 20
A.2 Calculation of methane number . 20
A.3 Example 1: 2H-gas . 21
A.4 Example 2: enriched biomethane . 27
A.5 Example 3: 2H-gas with hydrogen addition . 27
Annex B (informative) Limitations of the end-use gas applications to cope with the Wobbe
index entry range . 43
Annex C (informative) Possible mitigation measures for Wobbe index changes . 44
Annex D (informative) Considerations on on-site adjustment of combustion processes in
residential and commercial appliances . 46
D.1 General information . 46
D.2 Part 1 – Basics of combustion . 46
D.3 Part 2 – The theory behind the different types of adjustments . 48
D.4 Part 3 – On-site adjustment of the end-use applications related to the Wobbe index
exit classification . 57
Annex E (informative) National Wobbe index requirements . 61
Annex F (informative) Rate of change of the Wobbe index. 63
F.1 General. 63
F.2 Examples of nearly instantaneous changes in gas quality . 64
F.3 Impact of a changing Wobbe index on gas applications that are sensitive to Wobbe
index variations . 67
F.4 Measures to mitigate the effect of gas variations, step change and a high rate of change
................................................................................................................................................................... 68
Annex G (informative) Calorific value . 71
Annex H (informative) Sulfur . 73
Annex I (informative) Oxygen . 79
I.1 Origin of oxygen . 79
I.2 Challenges related to oxygen in natural gas grids . 79
I.3 Mitigation possibilities . 80
I.4 Oxygen measurement . 80
Annex J (informative) Water dew point and hydrocarbon dew point . 81
J.1 Water dew point . 81
Annex K (informative) Hydrogen . 82
Annex L (informative) Methane number . 85
Annex M (informative) Legal definitions which are considered useful for the topic of this
document . 87
Annex N (informative) A-deviations . 89
N.1 Denmark . 89
N.2 Estonia . 90
N.3 Hungary . 91
N.4 Ireland . 91
N.5 Italy . 92
N.6 Romania . 93
N.7 The Netherlands . 94
Bibliography . 96

European foreword
This document (EN 16726:2025) has been prepared by Technical Committee CEN/TC 234 “Gas
infrastructure”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2026, and conflicting national standards shall be
withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all su
...