1、SiD-BS BS EN 12838-ENGL 2000 Lb21lbb7 084A331 707 Is BRITISH STANDARD Installations and equipment for liquefied natural gas - Suitability testing of LNG sampling systems The European Standard EN 12838:2 has the status of a British Standard ICs 75.200 BS EN 12838:ZOOO NO COPYING WITHOUT BSI PERMISSIO
2、N EXCEPT AS PERMITTED BY COPYRIGHT LAW - STD*BSI BS EN L2838-ENGL 2000 m 3b2YbbS 0848332 b45 m been prepared under the direction of the Engineering Amd. No. Date Sector Committee, was published under the authority of the Standards Committee and comes into effect on 16 May 2000 Q BSI 05-2000 ISBN O 5
3、80 54249 2 BS EN 12838:2000 Comments National foreword This British Standard is the official English language version of EN 128382000. The UK participation in its preparation was entrusted to Technical Committee GSE/38, InstaMions and equipment for LNG, which has the responsibility to: - aid enquire
4、rs to understand the text; - present to the responsible European committee any enquiries on the - monitor related intrnaional and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; themintheuK. A list of organizations represented on this
5、 commike can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Intedonal Standards Correspondence Index”, or by us
6、ing the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not pinport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct appiication Compliance with a British Standard does not of itself confer immunity
7、from legal obligations. Summary of pages This document comprises a hnt cover, an Wide front cover, the EN title page, pages 2 to 33 and a back cover. The BSI copyright notice Wlayed in this document indicates when the document waslastissuea STD-BSI BS EN 32838-ENGL 2000 Lb2VbbS 0848333 581 EUROPEAN
8、STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 12838 January 2000 ICs 75.200 English version Installations and equipment for liquefied natural gas - Suitability testing of LNG sampling systems Installations et quipements relatifs au gaz naturel liqufi - Essais daptitude lemploi des systmes dchantillon
9、nage du GNL Anlagen und Ausrstung fr Flssigerdgas - Eignungsprfung von Flssigerdgas-Probenahrnesystemen This European Standard was approved by CEN on 3 December 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europein Sta
10、ndard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich 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
11、, German). A version in any other language made by trmslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as he official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark
12、, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stascart, 36 8-105
13、0 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12838:2000 E Page 2 EN 12838:2000 Contents Foreword 4 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 5 6 6.1 6.2 Measurement required 7 7 Suitability
14、 tests 8 7.1 General requirements of test performance . 8 7.2 Operating procedure . 8 7.3 Calculation of suitability criteria for the tested sampling system . 8 8 9 Test report 10 Annex A (informative) Continuous LNG sampling system . 12 Annex B (informative) Discontinuous LNG sampling system 13 Ann
15、ex C (informative) Thermodynamic conditions for the transformation of LNG into natural gas . 14 C.l General remarks . 14 C.2 Example of characteristic points . 15 Annex D (normative) Test rig 16 Annex E (normative) Means required to evaluate the test rig 17 E.l General remarks . 17 E.2 Measuring dev
16、ices . 17 E.3 Layout of measuring devices in test rig 17 Annex F (normative) Means required to evaluate a continuous LNG sampling system . 19 F.1 General remarks . 19 F.3 Layout of measuring devices in the tested sampling system 19 G.l General remarks . 21 G.2 Measuring devices . 21 6.3 Layout of me
17、asuring devices in the tested sampling system 21 Annex H (normative) Method of calculation of the accuracy of the test rig . 23 H.1 Mean values of physical properties derived from the analysis of the reference gas 23 H.2 Calculation of the relationship of the physical property with time of the refer
18、ence gas 23 H.3 Mean value of a physical property of the reference gas . 23 H.4 Random emor on a value of the reference gas 23 H.5 Random error on all values of the reference gas 24 H.6 Example of calculation 24 Description of a continuous LNG sampling system . 6 Description of a discontinuous LNG s
19、ampling system 6 Characteristics of the test rig . 6 Description of the test rig . 6 Suitability criteria for the LNG sampling system . 10 F.2 Measuring devices . 19 Annex G (normative) Means required to evaluate a discontinuous LNG sampling system . 21 . STD-BSI BS EN L2838-ENGL 2000 D Lb2YLLS 0848
20、335 35Li D Page 3 EN 12838:2000 Annex J (normative) Method of calculation of the accuracy of a continuous LNG sampling system. 26 J.l Deviation in relation to reference gas. of the physical propertyxderived from gas analyses obtained with the tested sampling system 26 J.2 Random error of the tested
21、sampling system . 26 J.3 Systematic error of the tested sampling system . 26 J.4 Statistical test on systematic error 27 5.5 Annex K (normative) Method of calculation of the accuracy of a discontinuous LNG K.l K.2 K.3 K.4 K.5 K.6 Example of calculation . I 27 sampling system . - 29 Calculation of th
22、e regression equation of the reference gas . 29 Random error of the tested sampling system . 29 Statistical test on systematic error . - 30 Example of calculation . - 31 Deviation of physical property X from regression equation 29 Systematic error of the tested sampling system . 30 O BSI 05-2000 STD
23、mBSI BS EN L2838-ENGL 2000 Lb211bb7 0811813b 290 W Page 4 EN 12838;2000 Foreword This European Standard has been prepared by Technical Committee CENTTC 282, Installation and equipment for LNG, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national s
24、tandard, 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 CENCENELEC internal Regulations, the national standards organizations of the following countries are b
25、ound 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 United Kingdom. (B BSI 05-2000 STD-BSI BS EN 12838-ENGL 2000 - Lb24bb 0848137
26、127 E Page 5 EN 12838:2000 1 Scope This standard specifies the tests to be carried out in order to assess the suitability of LNG sampling systems designed to determine the composition of Liquefied Natural Gas, in combination with an analytical device such as a chromatograph. 2 Normative references T
27、his European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publ
28、ications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1 160, Installations and equipment for liquefied natural gas - General characteristics of liquefied natural gas. IS0 28
29、54, Statistical interpretation of data - Techniques of estimation and tests relating to means and variances. IS0 6568, Natural gas - Simple analysis by gas chromatography. IS0 6578, Refrigerated hydrocanbon liquids - Static measurement - Calculation procedure. IS0 6976, Natural gas - Calculation of
30、calorific values, density, relative density and Wobbe index from composition. IS0 8943, Refrigerated light hydrocarbon fluids - Sampling of liquefied natural gas - Continuous method. 3 Terms and definitions For the purposes of this European Standard the following definitions, in addition to those gi
31、ven in EN 1160, apply: 3.1 liquefied natural gas (LNG) see EN 1160 3.2 transfer line pipe through which LNG is transferred 3.3 sampling bomb small capacity container filled with vaporized LNG and used to determine the composition by means of a chromatograph 3.4 continuous sampling process for contin
32、uously collecting Liquefied Natural Gas from the transfer line, which is subsequently vaporized and stored in a gasholder 3.5 discontinuous sampling process for continuously collecting Liquefied Natural Gas from the transfer line; the liquefied natural gas is subsequently vaporized and either analys
33、ed by chromatography at regular intervals, or sampled in sampling bombs at regular intervals O BSI 05-2000 STD.BS1 BS EN L2838-ENGL 2000 lb24bb9 0848338 b3 Page 6 EN 12838;2000 3.6 reference gas gas against which the gas sampled, by means of the tested sampling system, is compared 3.7 regression equ
34、ation of the reference gas relationship of a physical property with time, calculated via a polynomial function of order 5 4 Description of a continuous LNG sampling system The continuous LNG sampling system to be tested for suitability prior to installation on a transfer line, shall be designed in a
35、ccordance with the requirements of IS0 8943 standard. It is characterized by the use of a small capacity gasholder within which a sample of vaporized LNG, representative of the stock, is stored throughout the entire transfer operation. Once the transfer operation is completed, sampling bombs are fil
36、led with the gas stored in the gasholder. The LNG composition is then determined by chromatographic analysis of the gas contained in the sampling bombs for subsequent determination of the physical properties of the stock (LNG density, gas density and calorific value). Annex A presents a diagram of a
37、 continuous LNG sampling system. 5 Description of a discontinuous LNG sampling system A discontinuous sampling system supplies a continuous flow of natural gas derived from LNG vaporization, which is transferred via a sampling line to a chromatograph for analysis, at regular intervals, of the compos
38、ition of the LNG conveyed in the transfer line. In the absence of a sampling line, sampling bombs may be filled at regular intervals for subsequent chromatographic analysis of the contents. Once the transfer operation is completed, the physical properties of the LNG are then deduced via the arithmet
39、ic mean of the properties derived from the respective analyses. Annex B presents a diagram of two discontinuous LNG sampling systems. 6 Characteristics of the test rig 6.1 Description of the test rig The accuracy of an LNG sampling system shall be determined by comparing physical properties such as
40、density and gross calorific value derived from chromatographic analyses with the same properties calculated on the basis of the composition of the gas sampled following supercritical regasification of the LNG. The regasified LNG, hereafter designated as reference gas, shall serve as a reference to a
41、ssess the accuracy of the tested sampling systems. NOTE The supercritical regasification process eliminates any risk of fractionated vaporization during LNG transformation into natural gas. The composition of the resulting reference gas is thus free from fluctuation during regasification. Annex C de
42、scribes the thermodynamic conditions for LNG transformation into natural gas for various gas compositions. The test rig shall be composed of the following: a) a regasification unit, consisting of one LNG storage tank, one primaty pump, one high pressure pump and one vaporizer; b) a low pressure test
43、 loop containing the tested LNG sampling system; Q BSI 05-2000 STD-BSI BS EN 12838-ENGL 2000 W Lb24bb7 08118337 TTT 9 Page 7 EN 12838:2000 c) a sampling line for transfer of the reference gas from the sampling point located after the vaporizer towards a chromatograph: d) in the case of a discontinuo
44、us sampling system, a sampling line between the sampling system and the chromatograph. Annex D specifies the test rig to be used. NOTE All precautions should be taken to prevent any partial condensation of the reference gas prior to analysis. 6.2 Measurement required 6.2.1 Measurement required to ev
45、aluate the test rig In order to evaluate the test rig, the following quantities shall be measured and recorded: a) LNG pressure and temperature in the vicinity of the tested sampling system: b) gas pressure at the outlet of the high pressure vaporizer: c) flow rate of the high pressure vaporizer; d)
46、 natural gas temperature in the vicinity of the sampling point of reference gas; e) composition of reference gas by chromatographic analysis in compliance with IS0 6568. Annex E specifies the measuring equipment to be used. 6.2.2 Measurement required to evaluate a continuous LNG sampling system The
47、following quantities shall be measured and recorded in order to evaluate a continuous LNG sampling system: a) temperature and flow rate of the gas leaving the sampling vaporizer; b) pressure and flow rate of the gas during filling of the gasholder; c) pressure and Row rate of the gas during filling
48、of the sampling bombs: d) composition of the gas contained in the sampling bombs by means of the same chromatograph as previously used to analyze the compocf:on of the reference gas. Annex F specifies the measuring equipment to be used. 6.2.3 Means required to evaluate a discontinuous LNG sampling s
49、ystem The following quantities shall be measured and recorded in order to evaluate a discontinuous LNG sampling system: a) temperature and pressure of the gas leaving the sampling vaporizer; b) flow rate of the gas transferred via the sampling line; c) composition of the gas vaporized in the LNG sampling system by means of the same chromatograph as previously used to analyze the composition of the reference gas. Annex G specifies the measuring equipment to be used. O BSI 05-2000 Page 8 EN 12838:2000 7 Suitability tests 7.1 General requirements of test perf
