ISO 13443 1st Edition, December 15, 1996
Natural Gas - Standard Reference Conditions
Published By:International Organization for Standardization (ISO)
This International Standard specifies the standard reference conditions of temperature, pressure and humidity to be used for measurements and calculations carried out on natural gases, natural-gas substitutes and similar fluids.
The primary application is expected to be in international custody transfer, where the reduction to a common basis of those physical attributes of a gas which describe both its quality and quantity will simplify the practice of world trade and commerce.