SIST EN ISO 10715:2023
(Main)Natural gas - Gas sampling (ISO 10715:2022)
Natural gas - Gas sampling (ISO 10715:2022)
This document gives means for ensuring that samples of natural gas and natural gas substitutes that
are conveyed into transmission and distribution grids are representative of the mass to which they are
allocated.
NOTE To ensure that a particular gas is taken into account in the standard, please see Annex A.
This document is applicable for sampling at sites and locations where interchangeability criteria, energy
content and network entry conditions are measured and monitored and is particularly relevant at cross
border and fiscal measurement stations. It serves as an important source for control applications in
natural gas processing and the measurement of trace components.
This document is applicable to natural dry gas (single phase - typically gas transiting through natural
gas pipelines) sampling only. On occasion a natural gas flow can have entrained liquid hydrocarbons.
Attempting to sample a wet natural gas flow introduces the possibility of extra unspecified uncertainties
in the resulting flow composition analysis. Sampling a wet gas (two or three phases) flow is outside the
scope of this document.
This document does not apply to the safety issues associated with gas sampling.
Erdgas - Probenahme (ISO 10715:2022)
Dieses Dokument enthält Mittel, mit denen sichergestellt wird, dass Proben von Erdgas und Erdgasaustauschgas, das in Fernleitungs- und Verteilungsnetze geleitet wird, repräsentativ für den Hauptgasstrom sind, dem sie zugeordnet sind.
ANMERKUNG Um sicherzustellen, dass ein bestimmtes Gas in der Norm Berücksichtigung findet, siehe Anhang A.
Dieses Dokument ist für die Probenahme an Standorten und Stellen anwendbar, an denen Austauschbarkeitskriterien, Energiegehalt und Netzeinspeisebedingungen gemessen und überwacht werden, und ist insbesondere an grenzüberschreitenden und abrechnungsrelevanten Messstellen maßgebend. Es dient als wichtige Quelle für Kontrollanwendungen in der Erdgasverarbeitung und für die Messung von Spurenbestandteilen.
Dieses Dokument gilt nur für die Probenahme von trockenem Erdgas (einphasig — üblicherweise Gas, das durch Erdgasleitungen fließt). Gelegentlich kann ein Erdgasfluss mitgenommene flüssige Kohlenwasserstoffe enthalten. Der Versuch, einen feuchten Erdgasfluss zu beproben, führt möglichweise zu zusätzlichen, nicht spezifizierten Unsicherheiten bei der Analyse der resultierenden Gasflusszusammensetzung. Die Probenahme aus einem feuchten Gasfluss (zwei- oder dreiphasig) liegt nicht im Anwendungsbereich dieses Dokuments.
Dieses Dokument gilt nicht für die Sicherheitsfragen in Zusammenhang mit der Gasprobenahme.
WARNUNG — Allgemeine Aspekte der Erdgasbeschaffenheit sind in ISO 13686 [1] ausführlich beschrieben. Möglicherweise deckt die Norm nicht alle Spurenbestandteile ab, deren Überwachung aus verschiedenen Gründen zunehmend notwendig ist.
VORSICHT — Einige der regulierten Sonden benötigen womöglich ein Spezialwerkzeug für deren Ausbau. Siehe Anleitungen des Herstellers.
WARNUNG — Größtes Risiko bei regulierten Sonden: nicht empfohlen bei nassen Erdgasen wegen Hydratbildung — Verstopfung des Druckabfall-Systems.
Gaz naturel - Échantillonnage de gaz (ISO 10715:2022)
Zemeljski plin - Vzorčenje (ISO 10715:2022)
Ta dokument določa sredstva za zagotavljanje, da so vzorci zemeljskega plina in nadomestkov zemeljskega plina, ki se prenašajo v prenosna in distribucijska omrežja, reprezentativni za maso, ki so ji dodeljeni. OPOMBA: Ali je določen plin upoštevan v standardu, je mogoče preveriti v dodatku A. Ta dokument se uporablja za vzorčenje na mestih in lokacijah, kjer se merijo in spremljajo merila medsebojne zamenljivosti, vsebnost energije ter vstopni pogoji za omrežje. Še posebej je pomemben pri čezmejnih postajah in sistemih fiskalnega merjenja. Je pomemben vir za izvajanje nadzora pri predelavi zemeljskega plina in merjenju komponent v sledovih. Dokument se uporablja samo za vzorčenje suhega zemeljskega plina (enofaznega – običajno plina, ki teče po plinovodih za zemeljski plin). Zgodi se, da tok zemeljskega plina vsebuje tekoče ogljikovodike. Pri poskusu vzorčenja toka mokrega zemeljskega plina in analizi njegove sestave lahko pride do dodatnih nedefiniranih negotovosti. Vzorčenje toka mokrega plina (dvo- ali trifazni) ne spada na področje uporabe tega dokumenta. Dokument se ne navezuje na varnostna vprašanja, povezana z vzorčenjem plina.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10715:2023
01-januar-2023
Nadomešča:
SIST EN ISO 10715:2000
Zemeljski plin - Vzorčenje (ISO 10715:2022)
Natural gas - Gas sampling (ISO 10715:2022)
Erdgas - Probenahme (ISO 10715:2022)
Gaz naturel - Échantillonnage de gaz (ISO 10715:2022)
Ta slovenski standard je istoveten z: EN ISO 10715:2022
ICS:
75.060 Zemeljski plin Natural gas
SIST EN ISO 10715:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 10715:2023
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SIST EN ISO 10715:2023
EN ISO 10715
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 75.060 Supersedes EN ISO 10715:2000
English Version
Natural gas - Gas sampling (ISO 10715:2022)
Gaz naturel - Échantillonnage de gaz (ISO 10715:2022) Erdgas - Probenahme (ISO 10715:2022)
This European Standard was approved by CEN on 7 July 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10715:2022 E
worldwide for CEN national Members.
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SIST EN ISO 10715:2023
EN ISO 10715:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 10715:2023
EN ISO 10715:2022 (E)
European foreword
This document (EN ISO 10715:2022) has been prepared by Technical Committee ISO/TC 193 "Natural
gas" in collaboration with Technical Committee CEN/TC 238 “Test gases, test pressures, appliance
categories and gas appliance types” the secretariat of which is held by AFNOR.
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 April 2023, and conflicting national standards shall be
withdrawn at the latest by April 2023.
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 such patent rights.
This document supersedes EN ISO 10715:2000.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Endorsement notice
The text of ISO 10715:2022 has been approved by CEN as EN ISO 10715:2022 without any modification.
3
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SIST EN ISO 10715:2023
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SIST EN ISO 10715:2023
INTERNATIONAL ISO
STANDARD 10715
Second edition
2022-10
Natural gas — Gas sampling
Gaz naturel — Échantillonnage de gaz
Reference number
ISO 10715:2022(E)
© ISO 2022
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SIST EN ISO 10715:2023
ISO 10715:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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 2022 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 10715:2023
ISO 10715:2022(E)
Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Safety considerations . .4
5 Principles of sampling . .4
6 The concept of representative sample . 4
7 Types of sampling .5
7.1 Sampling method considerations . 5
7.2 Spot sampling . 6
7.2.1 General . 6
7.2.2 Fill-and-empty method . 6
7.2.3 Controlled-rate method . 7
7.2.4 Evacuated-cylinder method . 7
7.2.5 Helium pre-fill method . 7
7.2.6 Floating-piston cylinder method . 7
7.2.7 Single cavity sample cylinder . 7
7.2.8 Sampling frequency . 7
7.3 Incremental sampling (continuous or composite) . 9
7.3.1 General considerations . 9
7.3.2 Intervals . 9
7.3.3 System considerations . 9
7.3.4 Monitoring the filling process . 10
7.3.5 Cylinder tracking. 10
7.3.6 Overpressure protection. 10
7.4 Online or direct sampling . 10
7.4.1 General considerations . 10
7.4.2 Automatic drainage.12
7.4.3 Reducing the pressure.12
7.4.4 Inert-gas purging . 13
7.4.5 Safety/pressure relief valve . 13
7.4.6 Heating of sample line . 13
8 Sampling location . .13
8.1 General .13
8.2 Sampling place .13
8.2.1 General .13
8.2.2 Relevant gas . 14
8.2.3 Undisturbed gas . 14
8.2.4 Access . 14
8.3 Sampling position . 15
8.4 Sampling point . 15
9 Ideal implementation of gas sampling .16
9.1 General . 16
9.2 Gas sorption . 16
9.2.1 General . 16
9.2.2 Surface treatment . 17
9.2.3 Sorption considerations regarding sampling equipment . 17
9.2.4 Equilibrating of sampling equipment . 17
9.3 Materials used in sampling . . . 18
9.3.1 General considerations . 18
iii
© ISO 2022 – All rights reserved
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SIST EN ISO 10715:2023
ISO 10715:2022(E)
9.3.2 Steel grades . 19
9.3.3 Epoxy coatings . 19
9.3.4 Other polymers . 19
9.3.5 Rubbers . 19
9.3.6 Bimetallic corrosion . 19
9.4 Sample contamination . 19
9.4.1 Cleanliness . 19
9.4.2 Cleaning sampling systems . 19
9.4.3 Pre-charging of sample cylinders . 20
9.5 Sample condensation . 20
9.5.1 Temperature . 20
9.5.2 Pressure reduction and Joule Thomson cooling . 20
9.5.3 Condensation and revaporization . 22
9.6 Disturbance of the flow through the sampling system . 24
9.7 Delay time . 24
9.7.1 Direct sampling method . 24
9.7.2 Indirect sampling method . 25
10 Sampling equipment .26
10.1 General . 26
10.2 Probes . 27
10.2.1 General . 27
10.2.2 Straight-tube probe . 27
10.2.3 Probe regulator .28
10.2.4 Pitot probe .29
10.3 Tubings .30
10.3.1 Sampling and sample lines .30
10.3.2 Bypass constructions . 31
10.4 Filters, membranes and separators . 31
10.5 Valves and safety valves . 32
10.6 Fittings . 33
10.7 Flow monitoring and control . 33
10.8 Pressure reducers . 33
10.9 Pressure sensor/manometers.33
10.10 Heating devices . 33
10.11 Seals and lubricants .34
10.12 Sample containers or cylinders .34
10.12.1 General .34
10.12.2 Standard or single cavity cylinder . 35
10.12.3 Floating-piston cylinders or Constant Pressure cylinders . 35
10.13 Concentration devices .36
10.14 Number and sequence of equipment . 37
11 Verification of the system.38
12 Troubleshooting .39
Annex A (informative) Purposes of sampling, panel of compounds and information in the
sampling report .41
Annex B (informative) Procedures for sampling.42
Annex C (informative) Gas sorption effect: adsorption/desorption .49
Annex D (informative) Cleaning of steel sampling cylinders .50
Annex E (informative) Joule-Thomson cooling and phase behaviour .51
Annex F (informative) Vortex shedding and associated problems .54
Annex G (informative) Guidelines for the calculation of the residence time .58
Annex H (informative) Protocol for gas sampling system verification .66
iv
© ISO 2022 – All rights reserved
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SIST EN ISO 10715:2023
ISO 10715:2022(E)
Annex I (informative) Number of samples.68
Bibliography .70
v
© ISO 2022 – All rights reserved
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SIST EN ISO 10715:2023
ISO 10715:2022(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 ISO/TC 193, Natural Gas, Subcommittee SC 1,
Natural gas analysis, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 238, Test gases, test pressures and categories of appliances, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 10715:1997), which has been technically
revised.
The main changes are as follows:
— This new edition has placed a significant relevance on regular service, maintenance and validation
of installed sample systems which previously have not been given proper attention. Sample systems,
or at least the fixed/installed portion of them, have all too often been installed and forgotten without
realization that through use they become more and more contaminated leading to distortions of the
composition of the gas being sampled.
— Introduction of new sampling devices.
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.
vi
© ISO 2022 – All rights reserved
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SIST EN ISO 10715:2023
ISO 10715:2022(E)
Introduction
The composition, quality, and properties of natural gas vary according to amongst others its source, level
of processing, natural mixing at interconnection points, storage facilities, blending stations, fluctuating
demand for some of its derivatives such as LPG (Liquefied Petroleum Gases), and increasingly the need
to transport unconventional and renewable gases in the same network etc.
The variations that occur are closely monitored and controlled to ensure safety of the general public
as well as operational staff, plant, equipment and the gas infrastructures in general. Additionally and
commercially critical the energy content of the gas differs with these variations and is very accurately
monitored for billing and fiscal purposes because of the very large sums of money involved.
The variations that occur can be best collectively grouped under the generic term “Gas Quality” which
is subsequently referred to as GQ in this document.
For monitoring and controlling GQ, samples are taken at many and various stages along the way and
analysed. Such samples are taken under many different process parameters with a need to always
ensure that any gas that is subsequently analysed for such monitoring purposes is truly representative
of the bulk.
Methods of measuring GQ
...
SLOVENSKI STANDARD
oSIST prEN ISO 10715:2021
01-september-2021
Zemeljski plin - Vzorčenje (ISO/DIS 10715:2021)
Natural gas - Gas sampling (ISO/DIS 10715:2021)
Erdgas - Probenahme (ISO/DIS 10715:2021)
Gaz naturel - Échantillonnage de gaz (ISO/DIS 10715:2021)
Ta slovenski standard je istoveten z: prEN ISO 10715
ICS:
75.060 Zemeljski plin Natural gas
oSIST prEN ISO 10715:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 10715:2021
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oSIST prEN ISO 10715:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 10715
ISO/TC 193/SC 1 Secretariat: NEN
Voting begins on: Voting terminates on:
2021-07-22 2021-10-14
Natural gas — Gas sampling
ICS: 75.060
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 10715:2021(E)
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. ISO 2021
---------------------- Page: 3 ----------------------
oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(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: 4 ----------------------
oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(E)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety considerations . 4
5 Principles of sampling . 5
6 The concept of representative sample . 5
7 Types of sampling . 5
7.1 Sampling method considerations . 5
7.2 Spot sampling . 6
7.2.1 General. 6
7.2.2 Fill-and-empty method . 7
7.2.3 Controlled-rate method . 7
7.2.4 Evacuated-cylinder method . 7
7.2.5 Helium pre-fill method . 7
7.2.6 Floating-piston cylinder method . 7
7.2.7 Single cavity sample cylinder . 7
7.2.8 Sampling frequency . 8
7.3 Incremental sampling (Continuous or Composite) . 9
7.3.1 General considerations . 9
7.3.2 Intervals . 9
7.3.3 System considerations .10
7.3.4 Monitoring the filling process .10
7.3.5 Cylinder tracking .10
7.3.6 Overpressure protection .10
7.4 Online or direct sampling .11
7.4.1 General considerations .11
7.4.2 Automatic drainage .12
7.4.3 Reducing the pressure .12
7.4.4 Inert-gas purging .13
7.4.5 Safety/pressure relief valve .13
7.4.6 Heating of sample line .13
8 Sampling location .13
8.1 General .13
8.2 Sampling place .13
8.2.1 General.13
8.2.2 Relevant gas .14
8.2.3 Undisturbed gas . .14
8.2.4 Access .14
8.3 Sampling position .15
8.4 Sampling point .15
9 Ideal implementation of gas sampling .16
9.1 General .16
9.2 Gas sorption .16
9.2.1 General.16
9.2.2 Surface treatment.17
9.2.3 Sorption considerations regarding sampling equipment .17
9.2.4 Equilibrating of sampling equipment .17
9.3 Materials used in sampling .18
9.3.1 General considerations .18
© ISO 2021 – All rights reserved iii
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oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(E)
9.3.2 Steel grades.20
9.3.3 Epoxy coatings .20
9.3.4 Other polymers .20
9.3.5 Rubbers .21
9.3.6 Bimetallic corrosion .21
9.4 Sample contamination .21
9.4.1 Cleanliness .21
9.4.2 Cleaning sampling systems .21
9.4.3 Pre-charging of sample cylinders .21
9.5 Sample condensation .22
9.5.1 Temperature .22
9.5.2 Pressure reduction and Joule Thomson cooling .22
9.5.3 Condensation and revaporization .23
9.6 Disturbance of the flow through the sampling system.25
9.7 Delay time .25
9.7.1 Direct sampling method .25
9.7.2 Indirect sampling method .26
10 Sampling equipment .27
10.1 General .27
10.2 Probes .28
10.2.1 General.28
10.2.2 Straight-tube probe .28
10.2.3 Probe regulator .29
10.2.4 Pitot probe .30
10.3 Tubings .31
10.3.1 Sampling and sample lines .31
10.3.2 Bypass constructions .32
10.4 Filters, membranes and separators .32
10.5 Valves and safety valves .33
10.6 Fittings .34
10.7 Flow monitoring and control .34
10.8 Pressure reducers .34
10.9 Pressure sensor/manometers .34
10.10 Temperature devices .34
10.11 Seals and lubricants .35
10.12 Sample containers or cylinders .35
10.12.1 General.35
10.12.2 Standard or Single Cavity cylinder .36
10.12.3 Floating-piston cylinders or Constant Pressure cylinders .36
10.13 Concentration devices .37
10.14 Number and sequence of equipment .38
11 Verification of the system .39
12 Troubleshooting .40
Annex A (informative) Purposes of sampling and panel of compounds.42
Annex B (informative) Procedure for sampling .43
Annex C (informative) Gas sorption effect: adsorption/desorption .50
Annex D (informative) Cleaning of steel sampling cylinders .51
Annex E (informative) Joule-Thomson cooling and phase behaviour .52
Annex F (informative) Vortex Shedding and associated problems .55
Annex G (informative) Guidelines for the calculation of the residence time .58
Annex H (informative) Protocol for gas sampling system verification .67
Annex I (informative) Number of samples .69
iv © ISO 2021 – All rights reserved
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oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(E)
Bibliography .71
© ISO 2021 – All rights reserved v
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oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(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 ISO/TC 193, Natural Gas, Subcommittee SC 1,
Natural Gas Analysis.
This second edition cancels and replaces the first edition (ISO 10715:1997), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— This new edition has placed a significant relevance on regular service, maintenance and validation
of installed sample systems which previously have not been given proper attention. Sample systems,
or at least the fixed/installed portion of them, have all too often been installed and forgotten without
realization that through use they become more and more contaminated leading to distortions of the
composition of the gas being sampled.
— Introduction of new sampling devices
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.
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oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(E)
Introduction
The composition, quality, and properties of natural gas vary according to amongst others its source, level
of processing, natural mixing at interconnection points, storage facilities, blending stations, fluctuating
demand for some of its derivatives such as LPG (Liquefied Petroleum Gases), and increasingly the need
to transport unconventional and renewable gases in the same network etc.
The variations that occur are closely monitored and controlled to ensure safety of the general public
as well as operational staff, plant, equipment and the gas infrastructures in general. Additionally and
commercially critical the energy content of the gas differs with these variations and is very accurately
monitored for billing and fiscal purposes because of the very large sums of money involved.
The variations that occur can be best collectively grouped under the generic term “Gas Quality” which
shall subsequently be referred to as GQ in this document.
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oSIST prEN ISO 10715:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 10715:2021(E)
Natural gas — Gas sampling
WARNING — General quality aspects of natural gas are detailed in ISO 13686. However it
is possible that the standard does not cover all the trace constituents that are increasingly
necessary to monitor for various reasons.
For monitoring and controlling GQ, samples are taken at many and various stages along the way and
analysed. Such samples are taken from/under many different process parameters with a need to always
ensure that any gas that is subsequently analysed for such monitoring purposes is truly representative
of the bulk.
Methods of measuring GQ are well defined in numerous ISO standards as are the means of calibrating
such measuring instruments, however all those measurements and calibrations are all but futile if the
samples used for making such measurements are not representative. This document provides means
to ensure sampling systems and sampling processes are designed, located, installed, operated, and
maintained such that samples obtained are representative of the bulk to which they are attributed.
1 Scope
This document provides means for ensuring that samples of natural gas and natural gas substitutes
that are conveyed into transmission and distribution grids are representative of the mass to which they
are allocated.
NOTE To ensure that a particular gas is taken into account in the standard, please refer to Annex A.
This document provides comprehensive information on the way that samples can be contaminated,
altered, modified or degraded and methods, means and procedures for ensuring that the sample remains
representative from the start of the sampling process to the point where the sample is presented to the
analytical device.
This document is primarily intended for sampling at sites and locations where interchangeability
criteria, energy content and network entry conditions are measured and monitored and is particularly
relevant at cross border and fiscal measurement stations. It serves as an important source for control
applications in natural gas processing and the measurement of trace components.
This document does not address the safety issues associated with gas sampling.
This standard is applicable to natural dry gas (single phase - typically gas transiting through natural
gas pipelines) sampling only. On occasion a natural gas flow can have entrained liquid hydrocarbons.
Attempting to sample a wet natural gas flow introduces the possibility of extra unspecified uncertainties
in the resulting flow composition analysis. Sampling a wet gas (two or three phases) flow is outside the
scope of this standard.
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 8943, Refrigerated light hydrocarbon fluids — Sampling of liquefied natural gas — Continuous and
intermittent methods
ISO 13686, Natural gas — Quality designation
ISO 14532:2014, Natural gas — Vocabulary
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oSIST prEN ISO 10715:2021
ISO/DIS 10715:2021(E)
ISO 15156-1, Petroleum and natural gas industries — Materials for use in H2S-containing environments in
oil and gas production — Part 1: General principles for selection of cracking-resistant materials
3 Terms and definitions
For the purposes of this document, the terms and definitions from ISO 14532 and the following apply.
ISO and IEC maintain terminological databases
...
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