Tagasi

EVS-EN ISO 6976:2016

Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016)

Üldinfo
Kehtiv alates 04.10.2016
Alusdokumendid
EN ISO 6976:2016; ISO 6976:2016
Tegevusala (ICS grupid)
75.060 Maagaas
Direktiivid või määrused
puuduvad
Standardi ajalugu
Staatus
Kuupäev
Tüüp
Nimetus
04.10.2016
Põhitekst
06.07.2005
Põhitekst
This International Standard specifies methods for the calculation of gross calorific value, net calorific value, density, relative density, ross Wobbe index and net Wobbe index of natural gases, natural gas substitutes and other combustible gaseous fuels, when the composition of the gas by mole fraction is known. The methods specified provide the means of calculating the properties of the gas mixture at commonly used reference conditions. For the purpose of this International Standard the input mole fractions shall sum to unity exactly. Guidance on the achievement of this requirement is available in ISO 6974-1 and ISO 6974-2. All components with mole fractions greater than 0,000 05 shall be accounted for. If the composition of the gas is known by volume fractions, these shall first be converted to mole fractions in accordance with ISO 14912 (subclause 5.1.2). Note, however, that these derived mole fractions will have uncertainties greater than those of the original volume fractions. The methods of calculation require values for various physical properties of the pure components; these values, together with associated uncertainties, are provided in tables and their sources are identified. Methods are given for estimating the uncertainties of calculated properties. The methods of calculation of the values of properties on either a molar, mass or volumetric basis are applicable to any natural gas, natural gas substitute or other combustible fuel that is normally gaseous, except that for properties on the volumetric basis the method is restricted to mixtures for which the compression factor at reference conditions is greater than 0,9. Example calculations are given in annex D for the recommended methods of calculation.
*
*
*
PDF
22,86 € koos KM-ga
Paber
22,86 € koos KM-ga
Hind: 2,40 € koos KM-ga
Standardi monitooring
Teised on ostnud veel
Põhitekst

EVS-EN ISO 16923:2018

Maagaasi tanklad. CNG autotanklad
Uusim versioon Kehtiv alates 16.04.2018
Põhitekst

EVS-EN 16726:2015+A1:2018

Gaasivarustussüsteemid. Gaasi kvaliteet. Rühm H
Uusim versioon Kehtiv alates 01.08.2018
Põhitekst + parandus

EVS-EN IEC 60079-0:2018

Plahvatusohtlikud keskkonnad. Osa 0: Seadmed. Üldnõuded
Uusim versioon Kehtiv alates 16.07.2018
Põhitekst

EVS-EN ISO 23874:2018

Natural gas - Gas chromatographic requirements for hydrocarbon dewpoint calculation (ISO 23874:2006)
Uusim versioon Kehtiv alates 16.10.2018