M00017538
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ISO FDIS 15971 2008 Edition, September 10, 2008 NATURAL GAS - MEASUREMENT OF PROPERTIES - CALORIFIC VALUE AND WOBBE INDEX
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Availability date: 07/14/2021
Description / Abstract:
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.