1、BRITISH STANDARD Natural gas - Sampling guidelines The European Standard EN IS0 10715:2000 has the status of a British Standard ICs 75.060 BS EN IS0 10715:2001 BS 3 15 6-1 1 -0.1 : 2001 Incorporating Amendment No. 1 to (renumbers the BS as BS EN IS0 1071 5: 2001) BS 31 56- 11. O. 1:1997 NO COPYING W
2、ITHOUT BSI PERMISSION EXCEPT AS PEBMITTED BY COPYBIGET LAW - - STD-BSI BS EN IS0 107L5-ENGL 2OOL lbZqbb9 D877bL5 5b7 H BS EN IS0 10715:ZOOl authority of the Standards Board and comes into effect on 15 December 1997 12077 Amd. No. National foreword Date Comments March 2001 Implementation of the Europ
3、ean Standard This British Standard is the official English language version of EN IS0 10715:2000. It is identical with IS0 10715:1997. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: - aid enquirers t
4、o understand the text; - present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations repr
5、esented on this committee can be obtained on request to its secretary. WARNING. Regarding the cleaning procedure given in Annex B, it should be noted that excessive heating may deform the seals and seating of cylinder valves and can lead to subsequent leakage or valve failure. It is therefore import
6、ant that, during the drying stage of the cleaning procedure, the maximum temperature recommended by the manufacturer for the cylinder valves is not exceeded. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to i
7、nternational publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” f
8、acility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obl
9、igations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN IS0 title page, the EN IS0 foreword page, the IS0 title page, pages ii to iv, pages 1 to 30, an inside back cover and a back cover. The BSI copyright notice displayed in this document indi
10、cates when the document was last issued. O ES1 03-2001 ISBN O 580 28875 7 STD.BSI BS EN IS0 10715-ENGL 2001 Lb24669 0899616 4T5 m BS EN IS0 10715:2001 Contents Page National foreword Inside front cover Foreword iv Text of IS0 10715 1 Q BSI 03-2001 i STD-BSI BS EN IS0 L07LS-ENGL 2001 Lb246b9 0899bL7
11、331 EUROPEAN STANDARD EN IS0 10715 NORME EUROPENNE January 2000 EUROPISCHE NORM ICs 75.060 English version Natural gas - Sampling guidelines (IS0 10715:1997) Gaz naturel - Lignes directrices pour lchantillonnage (IS0 10715:1997) Erdgas -Probenahmerichtlinien (IS0 10715:1997) This European Standard w
12、as approved by CEN on 26 November 1999. CEN members are bound to comply with the CENKENELEC 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
13、national standards may be obtained on application to the Central Secretariat 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 an
14、d notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
15、land and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Ref. No. E
16、N IS0 10715:2000E Members. STD-BSI BS EN IS0 10715-ENGL 2001, Lb24669 0899b18 278 W EN IS0 10715:2000 Foreword The text of the International Standard from Technical Committee ISO/TC 193, Natural gas of the International Organization for Standardization (ISO) has been taken over as an European Standa
17、rd by CEN/CS. 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 July 2000, and conflicting national standards shall be withdrawn at the latest by July 2000. According to the CENEENELEC Internal Regu
18、lations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
19、United Kingdom. O BSI 03-2001 STD-BSI BS EN IS0 10715-ENGL iOOL m Lb24bb9 089bL LO4 m INTERNATIONAL STANDARD IS0 1071 5 First edition 1997-06-01 Natural gas - Sampling guidelines Gaz na furel - Lignes directrices pour lchantillonnage Reference number IS0 i 071 5: 1997( E) STD.BS1 BS EN IS0 L7LS-ENGL
20、 2OOL m LbZ4bb9 0899620 926 D EN IS0 10715:ZOOO Contents Foreword Introduction 1 Scope 2 Definitions 3 Principles of sampling 4 Safety precautions 5 Technical considerations 6 Materials used in sampling 7 General preparation of equipment 8 Sampling equipment 9 Spot sampling 10 Direct sampling 11 Inc
21、remental sampling Annex A (informative) Use of a block valve in direct sampling Annex B (informative) Cleaning of steel sampling cylinders Annex C (informative) Procedure for low-pressure sampling into glass cylinders Annex D (informative) Procedure for sampling by the fill-and-empty method Annex E
22、(informative) Procedure for sampling by the controlled-rate method Annex F (informative) Procedure for sampling by the evacuated-cylinder method Annex G (informative) Guidelines for the calculation of the residence time Annex H (informative) Students t-table Annex J (informative) Bibliography Figure
23、 1 - Survey of direct and indirect sampling methods Figure 2 - Example of a pressure/temperature diagram for natural gas Figure 3 - Straight-tube probe Figure 4 - Regulated probe Figure 5 - Drip pot installation Figure 6 - Separator Figure 7 - Heat box for pressure reduction in sampling Figure 8 - F
24、loating-piston cylinder Figure 9 - Continuous sampling using a pressure reducer Figure A.l- Principle of double block and bleed Figure A.2 - Single-sample, single-calibration-gas manifold Figure A.3 - Multigas manifold Figure C.l- Glass sample container (1 litre) Figure C.2 - Sampling into glass cyl
25、inders Figure C.3 - Sampling into glass cylinders from a sub-atmospheric pipeline Figure D.l- Fill-and-empty method Figure E. 1 - Controlled-rate method Figure F.l- Evacuated-cylinder method Figure G. 1 - Inlet pressure as a function of outlet flow rate (inner pipe diameter 3 mm) Figure G.2 - Inlet
26、pressure as a function of outlet flow rate (inner pipe diameter 4 mm) Page iv 1 1 1 2 4 5 8 9 10 14 15 17 18 19 20 21 22 24 25 29 30 3 6 10 11 13 13 13 14 16 18 18 19 20 21 21 22 23 24 26 26 O BSI 03-2001 11 STD-BSI BS EN IS0 LO7L5-ENGL 2001 lb24669 0899b2L 62 = EN IS0 10715:2000 Page Figure G.3 - I
27、nlet pressure as a function of outlet flow rate (inner pipe diameter 5 mm) 27 Figure G.4 - Purge time as a function of flow rate (inner pipe diameter 3 mm) 27 Figure G.5 - Purge time as a function of flow rate (inner pipe diameter 4 mm) 28 Figure G.6 - Purge time as a function of flow rate (inner pi
28、pe diameter 5 mm) 28 Figure H.1- Percentile values tp for Students t-distribution with u degrees of freedom (shaded area = p) 29 Table 1 - Compatibility of sampling-system materials with gas components 8 Table H. 1 - Students t-values 29 Descriptors: Natural gas, gas analysis, sampling, general cond
29、itions. Q BSI 03-2001 . 111 STD*BSI BS EN IS0 L0715-ENGL ZOOL D Lb24bb9 0877b22 7T9 EN IS0 10715:ZOOO Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normall
30、y carried out through IS0 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
31、work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requi
32、res approval by at least 75 % of the member bodies casting a vote. International Standard IS0 10715 was prepared by Technical Committee ISOPTC 193, Natural gus, Subcommittee SC 1, Analysis of natural gus. Annex A to Annex J of this International Standard are for information only. O BSI 03-2001 iv ST
33、D-BSI BS EN IS0 L07L5-ENGL 2001 1624669 0899b23 b35 EN IS0 10715:2000 Introduction This International Standard provides guidance on all aspects of the sampling of processed natural gas. Unless otherwise stated, all pressures up to 15 MPa in this International Standard are given as gauge pressures. T
34、he determination of the composition and the properties of the gas is highly dependent on the sampling technique. Also of great importance are the design, construction, installation and maintenance of the sampling system as well as the conditions of sample transfer and transport. These guidelines cov
35、er sampling strategy, details of sampling methods, the choice of sampling method and sampling equipment. This document is intended for use in those cases where sampling is not described as part of the analytical procedure. This document concentrates on sampling systems and procedures. Analyses from
36、the samples collected using these systems and procedures may be utilized in many different ways, including calculations to determine the calorific value of the gas stream, identification of contaminants contained in the gas stream, and compositional information to determine whether or not the stream
37、 meets contractual specifications. WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establ
38、ish appropriate safety and health practices and determine the applicability or regulatory limitations prior to use. All sampling activities shall comply with local safety regulations. 1 Scope The purpose of this document is to provide concise guidelines for the collection, conditioning and handling
39、of representative samples of processed natural gas streams. It also contains guidelines for sampling strategy, probe location and the handling and design of sampling equipment. It considers spot, composite (incremental) and continuous sampling systems. This document gives consideration to constituen
40、ts such as oxygen, hydrogen sulfide, air, nitrogen and carbon dioxide in the gas stream. This document does not include sampling of liquid streams or streams with multiphase flow. Traces of liquid, such as glycol and compressor oil, if present, are assumed to be intrusive and not a part of the gas t
41、o be sampled. Their removal is desirable to protect the sampling and analytical equipment from contamination. This document can be used for custody transfer measurement systems and allocation measurement systems. 2 Definitions For the purposes of this International Standard, the following definition
42、s apply: 2.1 direct sampling sampling in situations where there is a direct connection between the natural gas to be sampled and the analytical unit 2.2 floating-piston cylinder a container which has a moving piston separating the sample from a buffer gas. The pressures are in balance on both sides
43、of the piston 2.3 flow-proportional incremental sampler a sampler which collects gas over a period of time and at a rate that is proportional to the flow rate in the sampled pipeline 2.4 high-pressure natural gas natural gas with a pressure exceeding 0,2 MPa NOTE The maximum for this International S
44、tandard is 15 MPa. 2.5 hydrocarbon dew point the temperature, at a given pressure, at which hydrocarbon vapour condensation begins 2.6 incremental sampler a sampler which accumulates a series of spot samples into one composite sample 2.7 indirect sampling sampling in situations where there is no dir
45、ect connection between the natural gas to be sampled and the analytical unit 2.8 liquid separator a unit, in the sample line, used to collect liquid fall-out 0 BSI 03-2001 1 STDeBSI BS EN IS0 10715-ENGL 2001 1b24bb9 0899b24 571 EN IS0 10715:2000 2.9 low-pressure natural gas natural gas having a pres
46、sure between O and 0,2 MPa 2.10 purging time the period of time during which a sample purges a piece of equipment 2.11 representative sample a sample having the same composition as the natural gas sampled when the latter is considered as a homogeneous whole 2.12 residence time the time it takes for
47、a sample to flow through a piece of equipment 2.13 retrograde condensation retrograde behaviour describes the non-ideal phase properties of hydrocarbon gas mixtures, such as natural gas. Retrograde condensation is the production of a liquid phase of heavy hydrocarbons at a particular pressure and te
48、mperature where, at that same temperature, the gas stays in a single phase at a higher pressure as well as at a lower pressure NOTE See also 5.2. 2.14 sample container a container for collecting the gas sample when indirect sampling is necessary 2.15 sample line a line provided to transfer a sample
49、of the gas to the sampling point. It may include devices which are necessary to prepare the sample for transportation and analysis 2.16 sample probe a device inserted into the gas line to be sampled and to which a sample line is connected 2.17 sampling point a point in the gas stream where a representative sample can be collected 2.18 spot sample a sample of specified volume taken at a specified place at a specified time from a stream of gas 2.19 transfer line a line provided to carry the sample to be analysed from the sample point to t
