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386114 - ČSN EN ISO 15971 - Zemní plyn - Měření vlastností - Energetický obsah a Wobbeho číslo | ||
| Název : 386114 - ČSN EN ISO 15971 - Zemní plyn - Měření vlastností - Energetický obsah a Wobbeho číslo
Označení normy : ČSN EN ISO 15971 Katalogové číslo : 95589 Třídící znak : 386114 Účinnost : 2014-10-01 Věstník : 2014.09 Strany : 64 Převzata :vyhlášením ve Věstníku - v angličtině | ||
| Cena : | 564.00 Kč (DPH= 0%), s DPH= 564.00 Kč | |
| ANOTACE "ČSN EN ISO 15971 This International Standard concerns the measurement of calorific value of natural gas and natural gas substitutes by non-separative methods, i.e. methods that do not involve the determination of the gas composition nor calculation from it. It describes the principles of operation of a variety of instruments in use for this purpose, and provides guidelines for the selection, evaluation, performance assessment, installation and operation of these. Calorific values can be expressed on a mass basis, a molar basis or, more commonly, a volume basis. The working range for superior calorific value of natural gas, on the volume basis, is usually between 30 MJ/m3 and 45 MJ/m3 at standard reference conditions (see ISO 13443). The corresponding range for the Wobbe index is usually between 40 MJ/m3 and 60 MJ/m3. This International Standard neither endorses nor disputes the claims of any commercial manufacturer for the performance of an instrument. Its central thesis is that fitness-for-purpose in any particular application (defined in terms of a set of specific operational requirements) can be assessed only by means of a well-designed programme of experimental tests. Guidelines are provided for the proper content of these tests." | ||