kSIST FprEN 16726:2025

SL O V EN S K I kSIST FprEN 16726

S T ANDAR D
julij 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 kSIST FprEN 16726:2025 ((sl)en)

Nadaljevanje na straneh od II do IV in od 1 do 99

© 2025-07 Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

kSIST FprEN 16726 : 2025
NACIONALNI UVOD
Slovenski končni osnutek standarda kSIST FprEN 16726 ((sl)en), Infrastruktura za plin – Kakovost plina
– Skupina H, 2025 ima status slovenskega končnega osnutka evropskega standarda in je pripravljen
po metodi ponatisa izvirnika FprEN 16726 (en), Gas infrastructure – Quality of gas – Group H, 2025 z
nacionalnim dodatkom.
Ko bo ta slovenski standard izdan, bo nadomestil slovenski standard SIST EN 16726:2016+A1:2018.

NACIONALNI PREDGOVOR
Evropski standard EN 16726 pripravlja 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 potrditev besedila tega nacionalnega dodatka je 29. maja 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.

Predlagane vrednosti so podobne kot pri Nemčiji (DE) (v skladu z DVGW G260).

II
kSIST FprEN 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 _ 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
kSIST FprEN 16726 : 2025
ZVEZA 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
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 FprEN 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 FprEN 16726:2025 and is published with the permission of
CEN-CENELEC
Management Centre
Rue de la Science 23
B-1040 Brussels
IV
FINAL DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2025
ICS 75.060 Will supersede 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 draft European Standard is submitted to CEN members for formal vote. It has been drawn up by the Technical Committee
CEN/TC 234.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

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. FprEN 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
(informative) A-deviations . 89
M.1 Denmark . 89
M.2 Estonia . 90
M.3 Hungary . 91
M.4 Ireland . 91
M.5 Italy . 92
M.6 Romania . 93
M.7 The Netherlands . 94
Bibliography . 96
...