Oiml* r 140 Версия 2007 (E) Измерителни системи за газово гориво Systèmes de mesurage de gaz Organisation Internationale de Métrologie Légale Международната организация по законова метрология 1 Съдържание

Моларната маса а газ ( M_r ) в “kg/mol” се изчислява в съответствие със следното уравнение:

Където:

Като пример, моларната маса на смес на природен газ от три компонента съдържаща 90% метан, 5% въглероден диоксид и 5% азот ще бъде изчислена както следва.

Изчисляването на базовата свиваемост може да бъде постигнато или чраз метода сългасно ISO 6976 [12], или чрез други методи, признати от националните органи (за използване само на национално ниво).

[I] OIML V 2-200 International Vocabulary of Metrology - Basic and General Concepts and

[2] International vocabulary of terms in legal metrology (VIML). OIML, Paris, 2000

[3] Bureau International des Poids et Mesures (1998): The International System of Units (SI), Organisation Intergouvernementale de la Convention du Mètre, 7th edition, BIPM, Paris, 1998

[4] Bureau International des Poids et Mesures (2000): The International System of Units, Supplement 2000: addenda and corrigenda to the 7th edition (1998), BIPM, Paris, 2000

[5] OIML International Document D 2: Legal units of measurement, OIML, Paris, 1999

[6] OIML International Document D 11: General requirements for electronic measuring instruments. OIML, Paris, 2004

[7] Guide to the expression of uncertainty in measurement. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP and OIML. International Organization for Standardization, Geneva, 1995

[8] OIML Recommendation R 137-1: Gas meters – Part 1: Requirements, OIML, Paris, 2006

[9] ISO 12213-1 (2006): Natural gas — Calculation of compression factor — Part 1: Introduction and guidelines, ISO, Geneva, 2006

[10] ISO 12213-2 (2006): Natural gas — Calculation of compression factor — Part 2: Calculation using molar-composition analysis, ISO, Geneva, 2006

[II] ISO 12213-3 (2006): Natural gas — Calculation of compression factor — Part 3: Calculation
using physical properties, ISO, Geneva, 2006

[12] ISO 6976 (1995) with corrigendum 1 (1997), corrigendum 2 (1997) and corrigendum 3 (1999): Natural gas, calculation of calorific values, density, relative density, Wobbe index from composition, ISO, Geneva, 1995.

[13] IEC 60068-2-4 (2007-03) Environment testing Part 2-1: Tests – Test A: Cold

[14] IEC 60068-2-2 (2007-07)) Environmental testing - Part 2-2: Tests - Test B: Dry heat

[15] IEC 60068-3-1 (1974-01) with amendment 1 (1978-01) Environmental testing - Part 3: Background information - Section One: Cold and dry heat tests

[16] IEC 60068-3-4 (2001-08) Environmental testing Part 3-4: Supporting documentation and guidance - Damp heat tests

[17] IEC 60068-2-30 (2005-08) Environmental testing Part 2: Tests. Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle)

[18] IEC 60068-2-31 (2008-05) Environmental testing - Part 2-31: Tests - Test Ec: Rough handling shocks, primarily for equipment-type specimens

[19] IEC 60068-2-47 (2005-04) Environmental testing Part 2-47: Test methods, Mounting of components, equipment and other articles for vibration, impact and similar dynamic tests

[20] IEC 60068-2-64 (2008-04) Environmental testing - Part 2-64: Tests - Test Fh: Vibration, broadband random and guidance

[21] IEC 60068-2-78 (2001-08) Environmental testing - Part 2-78: Tests - Test Cab: Damp heat, steady state

[22] IEC 60654-2 (1979-01) with amendment 1 (1992-09) Operating conditions for industrial-process measurement and control equipment. Part 2: Power

[23] IEC 61000-2-2 (2002-03) Electromagnetic compatibility (EMC) - Part 2-2: Environment -Compatibility levels for low-frequency conducted disturbances and signalling in public low-voltage power supply systems

[24] IEC 61000-4-1 (2006-10) Electromagnetic compatibility (EMC) - Part 4-1: Testing and measurement techniques - Overview of IEC 61000-4 series

[25] IEC 61000-4-2 (2001-04) Electromagnetic compatibility (EMC)- Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test

[26] IEC 61000-4-3 (2008-04) Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test

[27] IEC 61000-4-4 (2004-07) Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test

[28] IEC 61000-4-5 (2005-11) Electromagnetic compatibility (EMC)- Part 4-5: Testing and measurement techniques - Surge immunity test

[29] IEC 61000-4-6 (2006-05) Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields

[30] IEC 61000-4-11 (2004-03) Electromagnetic compatibility (EMC)- Part 4-11: Testing and measuring techniques - Voltage dips, short interruptions and voltage variations immunity tests

[31] IEC 61000-6-1 (2005-03) Electromagnetic compatibility (EMC) - Part 6-1: Generic standards -Immunity for residential, commercial and light-industrial environments

[32] IEC 61000-6-2 (2005-01) Electromagnetic compatibility (EMC) - Part 6-2: Generic standards -Immunity for industrial environments

[33] IEC 60751 (1983-01) with amendment 1 (1986-01) and amendment 2 (1995-07) Industrial platinum resistance thermometer sensors

[34] ISO 6141 (2000) Gas analysis — Requirements for certificates for calibration gases and gas mixtures

[35] ISO/TR 7066-1 (1997) Assessment of uncertainty in calibration and use of flow measurement devices — Part 1: Linear calibration relationships

[36] ISO 7066-2 (1988) Assessment of uncertainty in the calibration and use of flow measurement devices — Part 2: Non-linear calibration relationships

[37] ISO 6551 (1982) Petroleum liquids and gases — Fidelity and security of dynamic measurement --Cabled transmission of electric and/or electronic pulsed data

[38] ISO 10715 (1997) Natural gas — Sampling guidelines

[39] IEC/TR 61000-2-1 (1990-05) Electromagnetic compatibility (EMC) Part 2: Environment Section 1: Description of the environment — Electromagnetic environment for low-frequency conducted disturbances and signalling in public power supply systems

[40] ISO 5167-1 (2003) Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements

[41] ISO 5167-2 (2003) Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates

[42] ISO 6142 (2001) Gas analysis — Preparation of calibration gas mixtures — Gravimetric method

[43] ISO 6143 (2001) Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures

[44] ISO/TR 11150 (2007) Natural gas - Hydrocarbon dew point and hydrocarbon content