{{short description, Standard energy measurement of natural gas
ISO 15971 is an
ISO
The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries.
Me ...
natural gas
Natural gas (also fossil gas, methane gas, and gas) is a naturally occurring compound of gaseous hydrocarbons, primarily methane (95%), small amounts of higher alkanes, and traces of carbon dioxide and nitrogen, hydrogen sulfide and helium ...
and its substitutes. The methods it covered does not involve gas composition determination and the related calculations.
The standard includes the operation of instruments that are used in the measurements and the guidelines in selecting and assessing, as well as the installation and the operation of such instruments.