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ISO 15970 Document Information:
Title
Natural gas — Measurement of properties — Volumetric properties: density, pressure, temperature and compression factor
International Organization for Standardization
Publication Date:
Jun 15, 2008
Scope:
This international Standard gives requirements and procedures
for the measurement of the properties of natural gas that are used
mainly for volume calculation and volume conversion: density at
reference and at operating conditions, pressure, temperature and
compression factor.
Only those methods and instruments are considered that are
suitable for field operation under the conditions of natural gas
transmission and distribution, installed either in-line or on-line,
and that do not involve the determination of the gas
composition.
This International Standard gives examples for currently used
instruments that are available commercially and of interest to the
natural gas industry.
NOTE Attention is drawn to requirements for approval of
national authorization agencies and to national legal regulations
for the use of these devices for commercial or official trade
purposes.
The density at reference conditions (sometimes referred to as
normal, standard or even base density) is required for conversion
of volume data and can be used for other physical properties.
Density at operating conditions is measured for mass-flow
measurement and volume conversion using the observed line density
and can be used for other physical properties. This International
Standard covers density transducers based on vibrating elements,
normally suitable for measuring ranges of 5 kg/m3 to 250
kg/m3.
Pressure measurement deals with differential, gauge and absolute
pressure transmitters. It considers both analogue and smart
transmitters (i.e. microprocessor based instruments) and, if not
specified otherwise, the corresponding paragraphs refer to
differential, absolute and gauge pressure transmitters without
distinction.
Temperature measurements in natural gas are performed within the
range of conditions under which transmission and distribution are
normally carried out (253 K < T < 338 K). In this
field of application, resistance thermometer detectors (RTD) are
generally used.
The compression factor (also known as the compressibility factor
or the real gas factor and given the symbol Z) appears, in
particular, in equations governing volumetric metering. Moreover,
the conversion of volume at metering conditions to volume at
defined reference conditions can properly proceed with an accurate
knowledge of Z at both relevant pressure and relevant temperature
conditions.
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