ABSTRACT
The installation of gas samplers at certain characteristic points within the network is a cheaper alternative. The whole eastern part is run with natural gas, group L, of different netherland and german origins. Especially within the L-gas region local and time variations of heating value in a range of 10 % have to be handled. Sample container has to be either evacuated by pipeline pressure or sweeped out with pipeline or inert gas. Fixing the sample size has to consider for real gas behaviour and varying pipeline temperature and pressure. The physical properties of natural gas in a sampling cylinder of constant volume are exactly described by the thermal equation of state. The mass in the cylinder can be calculated, if the pressure, the temperature and the composition of gas are known.
