1 Scope
This document gives means for ensuring that samples of natural gas and natural gas
substitutes that are conveyed into transmission and distribution grids are representative
of the mass to which they are allocated.
NOTE To ensure that a particular gas is taken into account in the standard, please see
Annex A.
This document is applicable for sampling at sites and locations where interchangeability
criteria, energy content and network entry conditions are measured and monitored and
is particularly relevant at cross border and fiscal measurement stations. It serves
as an important source for control applications in natural gas processing and the
measurement of trace components .
This document is applicable to natural dry gas (single phase ‑ typically gas transiting
through natural gas pipelines) sampling only. On occasion a natural gas flow can have
entrained liquid hydrocarbons. Attempting to sample a wet natural gas flow introduces
the possibility of extra unspecified uncertainties in the resulting flow composition
analysis. Sampling a wet gas (two or three phases) flow is outside the scope of this
document.
This document does not apply to the safety issues associated with gas sampling.