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DIN EN ISO 15971

2014 Edition, September 1, 2014

Complete Document

Natural gas - Measurement of properties - Calorific value and Wobbe index (ISO 15971:2008)

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Product Details:

  • Revision: 2014 Edition, September 1, 2014
  • Published Date: September 2014
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Deutsches Institut fur Normung E.V. (DIN)
  • Page Count: 58
  • ANSI Approved: No
  • DoD Adopted: No

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.