1、BRITISH STANDARD BS EN ISO 6570:2004 Incorporating Amendment No. 1 to BS ISO 6570:2001 (renumbers the BS ISO as BS EN ISO 6570:2004) Natural gas Determination of potential hydrocarbon liquid content Gravimetric methods The European Standard EN ISO 6570:2004 has the status of a British Standard ICS 7
2、5.060 BS EN ISO 6570:2004 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the authority of the Standards Policy and Strategy Committee on 24 April 2002 BSI 27 September 2004 ISBN 0 580 39581
3、2 National foreword This British Standard is the official English language version of EN ISO 6570:2004. It is identical with ISO 6570:2001. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis, which has the responsibility to: A list of or
4、ganizations represented on this committee can be obtained on request to its secretary. Additional information The committee responsible for this British Standard reminds users that uncertainties quoted with results of any analysis using these methods should follow the guidance given in PD 6461-3:199
5、5 “Vocabulary of metrology Part 3: Guild to the expression of uncertainty in measurement”. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards
6、Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does
7、 not of itself confer immunity from legal obligations. aid enquirers to 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 develo
8、pments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 21, the Annex ZA page, an inside back cover and a back cover. The BSI copy
9、right notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 15368 27 September 2004 Implementation of the European StandardEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO6570 September2004 ICS75.060 Englishversi
10、on NaturalgasDeterminationofpotentialhydrocarbonliquid contentGravimetricmethods(ISO6570:2001) GaznaturelDterminationdelateneurenhydrocarbures liquidespotentielsMthodesgravimtriques(ISO 6570:2001) ThisEuropeanStandardwasapprovedbyCENon22July2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalR
11、egulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialv
12、ersions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Fin
13、land,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ru
14、edeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO6570:2004:EI NESO 56:0702( 40E) 2 Foreword The text of ISO 6570:2001 has been prepared by Technical Committee ISO/TC 193 “Natural gas” of the International Organizati
15、on for Standardization (ISO) and has been taken over as EN ISO 6570:2004 by CMC. 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 2005, and conflicting national standards shall be withdrawn a
16、t the latest by March 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland
17、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6570:2001 has been approved by CEN as EN ISO 6570:2004 without any modifications. NOTE Normative refere
18、nces to International Standards are listed in Annex ZA (normative). ENISO6570:2004Reference number ISO 6570:2001(E) INTERNATIONAL STANDARD ISO 6570 First edition 2001-06-15 Natural gas Determination of potential hydrocarbon liquid content Gravimetric methods Gaz naturel Dtermination de la teneur en
19、hydrocarbures liquides potentiels Mthodes gravimtriques ENISO6570:2004ii ENISO6570:2004ISO 6570:2001(E)iii Contents Page Foreword.iv Introduction.v 1 Scope 1 2 Normative references 1 3 Principle2 4 Apparatus requirements .2 4.1 Measurement installation2 4.2 Check for correct installation operation .
20、5 5 Sampling.10 5.1 General10 5.2 Sampling conditions .10 5.3 Sample line.10 5.4 Direct sampling10 5.5 Indirect sampling .10 6 Procedure .11 6.1 Determination of potential hydrocarbon liquid content11 6.2 Determination of water formation 12 7 Expression of results 12 7.1 Method A Manual weighing met
21、hod12 7.2 Method B Indirect automatic method14 8 Uncertainty of measurement 15 8.1 Achievable uncertainty .15 8.2 Gas leakage15 8.3 Bath liquid 16 8.4 Wet gas .16 8.5 Condensate leakage 16 8.6 Variations in bath temperature and pressure in the gas/liquid cyclone separator 16 8.7 Premature condensati
22、on.16 9 Test report 16 Annex A (informative) Selection of measurement temperature and pressure17 Annex B (informative) Examples of the line-up of the apparatus 18 Annex C (informative) Example of calibration of the differential pressure gauge for the indirect automatic method Method B19 Annex D (inf
23、ormative) Example of an indirect automatic measurement Method B.21 1002:0756OSIENISO6570:2004ISO 6570:2001(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
24、 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 p
25、art in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by th
26、e technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
27、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 6570 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. This first edition cancels and replaces ISO 6570-1:1983 and ISO 65
28、70-2:1984, which have been technically revised. Annexes A to D of this International Standard are given for information only. 1002:0756OSIENISO6570:2004ISO 6570:2001(E)v Introduction Under certain conditions, higher hydrocarbons present in natural gas or similar gases may condense and the condensate
29、 formed can cause difficulties in the operation of gas transport and distribution systems. Dew-point measurements, by condensation on a mirror, may give an indication of the conditions under which condensation starts. However, these measurements give no further information about the amount of liquid
30、 to be expected under operating conditions. For proper operation of transport and distribution systems, a knowledge of the quantities of condensate formed as a function of temperature and pressure is required. This knowledge is also required for the design of production and treatment systems as well
31、 as for subsequent handling and disposal of the liquid. The methods described in this International Standard are intended for the determination of the quantity of hydrocarbon condensate formed from a natural gas or similar gas as a function of the temperature and pressure of the gas. Instruments bas
32、ed on different measurement principles can give a figure related to potential condensate content or dew point. The dew point can only be determined by performing measurements at different temperatures followed by extrapolation of the measurements to a potential hydrocarbon liquid content ( PHLC ) va
33、lue of zero. The methods described in this International Standard can be used to calibrate such instruments. 1002:0756OSIENISO6570:2004ENISO6570:2004INTENRATIONAL TSANDADR ISO 6570:2001(E) ISO 1002 All rights rsedevre 1 Natural gas Determination of potential hydrocarbon liquid content Gravimetric me
34、thods WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this International Standard to establish
35、 appropriate safety and health practices and to determine the applicability or regulatory limitations prior to use. 1 Scope This International Standard describes the principles of, and general requirements for, two gravimetric methods for the determination of the potential hydrocarbon liquid content
36、 of natural gas, or similar gas, at a given pressure and temperature. Two methods are specified in this International Standard to determine the amount of condensate in a sample gas: Method A: a manual weighing method; Method B: an indirect automatic weighing method based on the indication of the pre
37、ssure difference caused by the accumulation of condensate in a vertical tube. The manual weighing method is a reference method for the indirect automatic method (Method B). The indirect automatic method (Method B) is suitable for semi-continuous control. NOTE Unless otherwise specified, gas volumes
38、are in cubic metres at 273,15 K and 101,325 kPa. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publ
39、ications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to a
40、pplies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 6976:1995, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition ISO 10715:1997, Natural gas Sampling guidelines ISO 12213-1:1997, Natural gas Calculati
41、on of compression factor Part 1: Introduction and guidelines ISO 12213-2:1997, Natural gas Calculation of compression factor Part 2: Calculation using molar-composition analysis ISO 12213-3:1997, Natural gas Calculation of compression factor Part 3: Calculation using physical properties 1002:0756OSI
42、1 ENISO6570:2004ISO 0756:(1002)E 2 ISO 1002 All rights rsedevre 3P r i n c i p l e Determination of the quantity of hydrocarbon condensate which can be formed at a pressure (p) and a temperature (T) by passing a representative sample of the gas through an apparatus where it is first brought to the p
43、ressure (p) and then cooled to the temperature (T). The temperature and pressure are selected according to the specific application (see annex A). Prior to reducing the pressure of the sample of gas to that required for the determination, the gas is heated, so that, after pressure reduction, the tem
44、perature is well above the dew-point temperature of the gas. Downstream of the reducer, the sample is cooled isobarically in a cooling bath to the required measurement temperature. The quantity of liquid accumulated during the measurement period is determined by either direct manual weighing of the
45、collected liquid or weighing of the condensate cyclone separator at the start and at the end of a measurement period (Method A). Alternatively, the quantity of liquid accumulated in a vertical measuring tube may be determined automatically (indirect automatic weighing) by indication of the pressure
46、difference caused by the liquid accumulated in a vertical measuring tube. 4 Apparatus requirements WARNING The instrumentation used for this method shall comply with local legal regulations for application in hazardous areas. 4.1 Measurement installation The general arrangement is shown in Figure 1.
47、 Examples of the line-up of the apparatus are given in annex B. 4.1.1 Gas-line connecting tubes, made of stainless steel with an internal diameter ranging between 2 mm and 4mm. If mist is present in the gas, all tubing up to the point where the mist is evaporated or separated shall have an internal
48、diameter compatible with that of the sample line (4.1.2). 4.1.2 Sample line, the length of which is kept to a minimum and temperature-controlled along its length to at least the point where it enters the part of the installation where the measurement is made. An example of a sample line is given in Figure 2. The sample line can be heated by fitting a plastic hose concentrically around the line through which water flows at the desired temperature. For this purpose, a temperature-controlled bath can be used
