Alignment with Grade D of ISO 14687

Alignement avec le Grade D de l'ISO 14687

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Status
Published
Publication Date
09-Aug-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
16-Jun-2021
Completion Date
15-Jun-2021
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INTERNATIONAL ISO
STANDARD 19880-8
First edition
2019-10
AMENDMENT 1
2021-08
Gaseous hydrogen — Fuelling
stations —
Part 8:
Fuel quality control
AMENDMENT 1: Alignment with Grade D
of ISO 14687
Hydrogène gazeux — Stations de remplissage —
Partie 8: Contrôle qualité du carburant
AMENDEMENT 1: Alignement avec le Grade D de l'ISO 14687
Reference number
ISO 19880-8:2019/Amd.1:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 TC 197, Hydrogen technologies.
A list of all parts in the ISO 19880 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.
© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
Gaseous hydrogen — Fuelling stations —
Part 8:
Fuel quality control
AMENDMENT 1: Alignment with Grade D of ISO 14687
Clause 5, first paragraph
Replace the paragraph with the following:

The quality requirements of hydrogen fuel dispensed to PEM fuel cells for road vehicles are listed

in Grade D of ISO 14687.
8.4, first paragraph
Replace the paragraph with the following:

It is necessary to evaluate the possible consequences on a fuel cell vehicle if any impurity exceeds

the threshold value of ISO 14687 Grade D.
8.4, second paragraph
Replace the paragraph with the following:

An estimation of the concentration above the ISO 14687 Grade D threshold values at which the

severity increases (if applicable) is named “Level 1” and is given in column 5 for each impurity

where the “severity class” is not already 4.
Table 4
Replace Table 4 with the following table:
© ISO 2021 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
Table 4 — Impact of impurities on fuel cell powertrain
Severity class
Severity class
ISO 14687 (from ISO 14687
(greater than
Impurity Grade D Grade D Level 1 value
Level 1
threshold value threshold value
threshold)
to Level 1)
[μmol/mol] [μmol/mol]
b b
Total non-H gases 300 UD UD 4
b b
Helium He 300 UD UD 4
b b
Nitrogen N 300 UD UD 4
b b
Argon Ar 300 UD UD 4
c c
Oxygen O 5 UD UD 4
Carbon dioxide CO 2 1 3 4
Carbon monoxide CO 0,2 2-3 1 4
Methane CH 100 1 300 4
Water H O 5 4 N/A 4
Total sulphur H S
0,004 4 N/A 4
compounds basis
Ammonia NH 0,1 4 N/A 4
Total hydrocarbons CH
4 d
2 1-4 N/A 4
except methane basis
Formaldehyde HCHO 0,2 2-3 1 4
Formic acid HCOOH 0,2 2-3 1 4
Halogens 0,05 4 N/A 4
Maximum particulate
concentration (liquid 1 mg/kg 4 N/A 4
and solid)
Key
UD: undetermined
N/A: not applicable

The threshold value is according to hydrogen specification of Grade D of ISO 14687.

The severity class (from ISO 14687 Grade D threshold value to Level 1) and Level 1 value for this impurity is

undetermined because no specific study has been conducted yet in alignment with the new threshold value. It needs to be

covered in the next edition of this document.

The severity class (from ISO 14687 Grade D threshold value to Level 1) and Level 1 value for oxygen are undetermined

because data are lacking to confirm those values. It needs to be covered in the next edition of this document.

A higher value is to be considered for risk assessment approach until more specific data is available.

Particulates are based upon mass density mg/kg.
A.15 first paragraph
Replace “ISO 14687-2” with “Grade D of ISO 14687” in the second last sentence.
Table B.1
Replace Table B.1 with the following table:
2 © ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
© ISO 2021 – All rights reserved 3
Table B.1 — Probability of occurrence for off-site SMR
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— PSA
Inert gas Present in natural gas and syn-
300 UD
N gas PSA malfunction
— Double analysis PSA outlet <100 μmol/mol

Inert gas Only ATR and POx present in O — PSA. Not sized to remove Ar. Ar content may be higher if H comes from ATR, POX or

2 2
300 UD
Ar typical 0,6 % in syngas from ATR feeds with high Ar content
Not present in syngas. O is un-
stable in the condition of reform-
O 5 — PSA cannot be used with significant O content for safety reasons 0
2 2
ing and shift reactions. Combines
with H , CO, and CH
2 4

— PSA adsorption strength of MS, activated carbon, silicagel higher for CO than CO. A

CO 2 Present in syngas (%) 0
CO content lower than 10μmol/mol insures a CO content lower than 2 μmol/mol
Normal operation below thresh-

CO 0,2 old. Occasional peaks at μmol/ — Double analysis at the PSA outlet + trip if the CO>1-10 μmol/mol at PSA outlet 4

mol level

— In most cases CO is sizing the PSA, therefore CO<10 μmol/mol ==> C H < 100 μmol/mol

CH 100 Present in syngas at % level 2
depending on users' specification (Europe pipeline 2 μmol/mol).
— PSA adsorbed in alumina and MS adsorption strength higher than CO .
H O 5 Syngas saturated in H O 0
2 2
A CO content lower than 10 μmol/mol insures a H O content lower than 5 μmol/mol.
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study has been conducted yet.

---------------------- Page: 6 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
4 © ISO 2021 – All rights reserved
Table B.1 (continued)
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— Desulphuration upstream reformer (typical values: normal < 10 ppb,
maximum < 20 ppb, guarantee < 50 ppb)
— Typical dilution factor 2,5 (1 mole natural gas produces 2,5 mole H )

— Pre-reformer catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage.

In case of breakthrough, process condition cannot be achieved

TS 0,004 TS from natural gas — Reformer catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage. 0

In case of breakthrough, process condition cannot be achieved

— Shift catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage.

In case of breakthrough, process condition cannot be achieved
— PSA adsorption of H S before CO, CO , species
2 2
— H S adsorption in pipe and vessels. Strong affinity with steel

— PSA adsorption strength of alumina and molecular sieve higher than CO. A CO content

NH 0,1 Traces present in syngas 0
lower than 10μmol/mol insures a NH content lower than 0,1 μmol/mol

Traces of C2+ after reforming — PSA C2 C3, C4, C5+adsorbed by activated carbon layer. A CO content lower than

THC 2 0
reaction 10 μmol/mol insures a THC (C H excluded) content lower than 2 μmol/mol

— PSA. Formaldehyde adsorption strength of alumina and molecular sieve higher than

May be present in syngas. CO. A CO content lower than 10 μmol/mol insures a HCHO content lower than 0,1 μmol/

HCHO 0,2 UD

essentially liquid mol. To guarantee 0,01 μmol/mol would require more experience of measuring at

those levels
— PSA. Formic adsorption strength of alumina and molecular sieve higher than CO.
May be present in syngas

HCOOH 0,2 A CO content lower than 10 μmol/mol insures a HCOOH content lower than 0,2 μmol/ 0

essentially liquid
mol
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study has been conducted yet.

---------------------- Page: 7 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
© ISO 2021 – All rights reserved 5
Table B.1 (continued)
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— Any Cl present in natural gas would be stopped by HDS

— Pre-reformer catalyst poisoning by Cl irreversible Cl trapped at this stage. If

breakthrough, process condition cannot be achieved

— Reformer catalyst poisoning by Cl irreversible. Cl trapped at this stage I break through,

Halogens 0,05 Present in natural gas 0
process condition cannot be achieved

— Shift catalyst poisoning by Cl irreversible. Cl trapped at this stage. I break through,

process condition cannot be achieved
— PSA adsorption of Cl before CO, CO , species
Not present in natural gas in N
Europe (<10 μmol/mol). Passes
He 300 0
through the whole process. Dilu-
tion factor 2,5
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study has been conducted yet.

---------------------- Page: 8 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
Table B.2
Replace Table B.2 with the following table:
Table B.2 — Probability of occurrence for pipeline
Typical barriers Probability
Causes possible
Impurity Threshold employed in with
For the item studied
this process barriers
μmol/mol
Air intake if some areas are at negative
Inert gas pressure Inlet pressure PSL trip on
300 UD
N From seal gas or purge gas compressors
Wrong purging after maintenance
1 % Ar in the air.
Inert gas 100 μmol/mol would
300 No potential UD
Ar mean 1 % air in the pipe
Never been observed
Air intake if some areas are at negative Inlet pressure PSL trip on
O 5 1
pressure compressors
2 μmol/mol of C O would
mean 0,5 % air in the
CO 2 From Air: CO at 400 μmol/mol in the air 0
2 2
pipe
Never been observed
CO 0,2 No potential 0
CH 100 No potential 0
H > 40 bar ==> leak from
H O 5 Wrong drying after pressure hydraulic test H O to H unlikely during 0
2 2 2
operation.
TS 0,004 No potential 0
NH 0,1 No potential 0
THC 2 No potential 0
HCHO 0,2 No potential UD
HCOOH 0,2 No potential 0
Halogens 0,05 From cleaning material after maintenance 1
He 300 No potential 0
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study has been conducted yet. It

needs to be covered in the next edition of this document.
6 © ISO 2021 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 19880-8:2019/Amd.1:2021(E)
Table B.3
Replace Table B.3 with the following table:

Table B.3 — Probability of occurrence for fuelling station to be source of impurities

Causes possible
Impurity Threshold Existing barriers Probability
For the source studied
μmol/mol
Inert gas N purging operation, air intake during
2 a
300 UD
N normal operation or maintenance
1 % Ar in the air.
100 μmol/mol would
Inert gas Air intake during normal operation or
300 mean 1 % air in the UD
Ar maintenance
fuelling station
Never been observed
Air intake during normal operatio
...

FINAL
ISO
AMENDMENT
DRAFT
19880-8:2019
FDAM 1
ISO/TC 197
Gaseous hydrogen — Fuelling
Secretariat: SCC
stations —
Voting begins on:
2021-04-20
Part 8:
Voting terminates on:
Fuel quality control
2021-06-15
AMENDMENT 1
Hydrogène gazeux — Stations de remplissage —
Partie 8: Contrôle qualité du carburant
AMENDEMENT 1
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO 19880-8:2019/FDAM 1:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
---------------------- Page: 1 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 TC 197, Hydrogen technologies.
A list of all parts in the ISO 19880 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.
© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
Gaseous hydrogen — Fuelling stations —
Part 8:
Fuel quality control
AMENDMENT 1
Clause 5, first paragraph
Replace the paragraph with the following:

The quality requirements of hydrogen fuel dispensed to PEM fuel cells for road vehicles are listed

in Grade D of ISO 14687.
8.4, first paragraph
Replace the paragraph with the following:

It is necessary to evaluate the possible consequences on a fuel cell vehicle if any impurity exceeds

the threshold value of ISO 14687 Grade D.
8.4, second paragraph
Replace the paragraph with the following:

An estimation of the concentration above the ISO 14687 Grade D threshold values at which the

severity increases (if applicable) is named “Level 1” and is given in column 5 for each impurity

where the “severity class” is not already 4.
Table 4
Replace Table 4 with the following table:
© ISO 2021 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
Table 4 — Impact of impurities on fuel cell powertrain
Severity class
Severity class
ISO 14687 (from ISO 14687
(greater than
Impurity Grade D Grade D Level 1 value
Level 1
threshold value threshold value
threshold)
to Level 1)
[μmol/mol] [μmol/mol]
b b
Total non-H gases 300 UD UD 4
b b
Helium He 300 UD UD 4
b b
Nitrogen N 300 UD UD 4
b b
Argon Ar 300 UD UD 4
c c
Oxygen O 5 UD UD 4
Carbon dioxide CO 2 1 3 4
Carbon monoxide CO 0,2 2-3 1 4
Methane CH 100 1 300 4
Water H O 5 4 N/A 4
Total sulphur H S
0,004 4 N/A 4
compounds basis
Ammonia NH 0,1 4 N/A 4
Total hydrocarbons CH
4 d
2 1-4 N/A 4
except methane basis
Formaldehyde HCHO 0,2 2-3 1 4
Formic acid HCOOH 0,2 2-3 1 4
Halogens 0,05 4 N/A 4
Maximum particulate
concentration (liquid 1 mg/kg 4 N/A 4
and solid)
Key
UD: undetermined
N/A: not applicable

The threshold value is according to hydrogen specification of Grade D of ISO 14687.

The severity class (from ISO 14687 Grade D threshold value to Level 1) and Level 1 value for this impurity is

undetermined because no specific study was done yet on that in order to be modified to be aligned with the new threshold

value. It needs to be covered in the next edition of this document.

The severity class (from ISO 14687 Grade D threshold value to Level 1) and Level 1 value for oxygen are undetermined

because data are lacking to confirm those values. It needs to be covered in the next edition of this document.”

A higher value is to be considered for risk assessment approach until more specific data is available.

Particulates are based upon mass density mg/kg.
A.15 first paragraph
Replace “ISO 14687-2” with “Grade D of ISO 14687” in the second last sentence.
Table B.1
Replace Table B.1 with the following table:
2 © ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
© ISO 2021 – All rights reserved 3
Table B.1 — Probability of occurrence for off-site SMR
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— PSA
Inert gas Present in natural gas and syn-
300 UD
N gas PSA malfunction
— Double analysis PSA outlet <100 μmol/mol

Inert gas Only ATR and POx present in O — PSA. Not sized to remove Ar. Ar content may be higher if H comes from ATR, POX or

2 2
300 UD
Ar typical 0,6 % in syngas from ATR feeds with high Ar content
Not present in syngas. O is un-
stable in the condition of reform-
O 5 — PSA cannot be used with significant O content for safety reasons 0
2 2
ing and shift reactions. Combines
with H , CO and CH
2 4

— PSA adsorption strength of MS, activated carbon, silicagel higher for CO than CO. A

CO 2 Present in syngas (%) 0
CO content lower than 10μmol/mol insures a CO content lower than 2 μmol/mol
Normal operation below thresh-

CO 0,2 old. Occasional peaks at μmol/ — Double analysis at the PSA outlet + trip if the CO>1-10 μmol/mol at PSA outlet 4

mol level

— In most cases CO is sizing the PSA, therefore CO<10 μmol/mol ==> C H < 100 μmol/mol

CH 100 Present in syngas at % level 2
depending on users' specification (Europe pipeline 2 μmol/mol).
— PSA adsorbed in alumina and MS adsorption strength higher than CO .
H O 5 Syngas saturated in H O 0
2 2
A CO content lower than 10 μmol/mol insures a H O content lower than 5 μmol/mol.
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study was done yet on that in order to be modified to be aligned with the new threshold

value. It needs to be covered in the next edition of this document.
---------------------- Page: 6 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
4 © ISO 2021 – All rights reserved
Table B.1 (continued)
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— Desulphuration upstream reformer (typical values: normal < 10 ppb,
maximum < 20 ppb, guarantee < 50 ppb)
— Typical dilution factor 2,5 (1 mole natural gas produces 2,5 mole H )

— Pre-reformer catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage.

In case of breakthrough, process condition cannot be achieved

TS 0,004 TS from natural gas — Reformer catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage. 0

In case of breakthrough, process condition cannot be achieved

— Shift catalyst poisoning by sulphur is irreversible. Sulphur trapped at this stage.

In case of breakthrough, process condition cannot be achieved
— PSA adsorption of H S before CO, CO , species
2 2
— H S adsorption in pipe and vessels. Strong affinity with steel

— PSA adsorption strength of alumina and molecular sieve higher than CO. A CO content

NH 0,1 Traces present in syngas 0
lower than 10μmol/mol insures a NH content lower than 0,1 μmol/mol

Traces of C2+ after reforming — PSA C2 C3, C4, C5+adsorbed by activated carbon layer. A CO content lower than

THC 2 0
reaction 10 μmol/mol insures a THC (C H excluded) content lower than 2 μmol/mol

— PSA. Formaldehyde adsorption strength of alumina and molecular sieve higher than

May be present in syngas. CO. A CO content lower than 10 μmol/mol insures a HCHO content lower than 0,1 μmol/

HCHO 0,2 UD

essentially liquid mol. To guarantee 0,01 μmol/mol would require more experience of measuring at

those levels
— PSA. Formic adsorption strength of alumina and molecular sieve higher than
May be present in syngas

HCOOH 0,2 CO. A CO content lower than 10 μmol/mol insures a HCOOH content lower than 0

essentially liquid
0,2 μmol/mol
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study was done yet on that in order to be modified to be aligned with the new threshold

value. It needs to be covered in the next edition of this document.
---------------------- Page: 7 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
© ISO 2021 – All rights reserved 5
Table B.1 (continued)
Probabil-
Possible causes ity
Impurity Threshold Typical barriers employed in this process
For the source studied with
barriers
μmol/mol
— Any Cl present in natural gas would be stopped by HDS

— Pre-reformer catalyst poisoning by Cl irreversible Cl trapped at this stage. If

breakthrough, process condition cannot be achieved

— Reformer catalyst poisoning by Cl irreversible. Cl trapped at this stage I break through,

Halogens 0,05 Present in natural gas 0
process condition cannot be achieved

— Shift catalyst poisoning by Cl irreversible. Cl trapped at this stage. I break through,

process condition cannot be achieved
— PSA adsorption of Cl before CO, CO , species
Not present in natural gas in N
Europe (<10 μmol/mol). Passes
He 300 0
through the whole process. Dilu-
tion factor 2,5
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study was done yet on that in order to be modified to be aligned with the new threshold

value. It needs to be covered in the next edition of this document.
---------------------- Page: 8 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
Table B.2
Replace Table B.2 with the following table:
Table B.2 — Probability of occurrence for pipeline
Typical barriers Probability
Causes possible
Impurity Threshold employed in with
For the item studied
this process barriers
μmol/mol
Air intake if some areas are at negative
Inert gas pressure Inlet pressure PSL trip on
300 UD
N From seal gas or purge gas compressors
Wrong purging after maintenance
1 % Ar in the air.
Inert gas 100 μmol/mol would
300 No potential UD
Ar mean 1 % air in the pipe
Never been observed
Air intake if some areas are at negative Inlet pressure PSL trip on
O 5 1
pressure compressors
2 μmol/mol of C O would
mean 0,5 % air in the
CO 2 From Air:C O at 400 μmol/mol in the air 0
2 2
pipe
Never been observed
CO 0,2 No potential 0
CH 100 No potential 0
H > 40 bar ==> leak from
H O 5 Wrong drying after pressure hydraulic test H O to H unlikely during 0
2 2 2
operation.
TS 0,004 No potential 0
NH 0,1 No potential 0
THC 2 No potential 0
HCHO 0,2 No potential UD
HCOOH 0,2 No potential 0
Halogens 0,05 From cleaning material after maintenance 1
He 300 No potential 0
Key
UD: undetermined

The probability of occurrence for this impurity is undetermined because no specific study was done yet on that in

order to be modified to be aligned with the new threshold value. It needs to be covered in the next edition of this document.

6 © ISO 2021 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 19880-8:2019/FDAM 1:2021(E)
Table B.3
Replace Table B.3 with the following table:

Table B.3 — Probability of occurrence for fuelling station to be source of impurities

Causes possible
Impurity Threshold Existing barriers Probability
For the source studied
μmol/mol
Inert gas N purging operation, a
...

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