Injection of alternative gases into traditional natural gas pipeline systems is rapidly growing part of the energy transition, with the aim to reduce emissions and to provide part of alternative energy sourcing as well. Important aspect is the handling of gas heating value as the energy content of gas in the pipeline system is no more stable.
The paper aims to continue the theoretical background summary and first practical experience presented in PSIG 2321 concentrating now on the field tests and verification process of the 2 particular projects of calorific value tracking:
- High-pressure national scale distribution system, supplied by several transfer stations from upstream system, several gas storages and (growing) number of biomethane stations acting as small local supplies.
- Mid- and low-pressure large city distribution network with biomethane station injecting into the mid-pressure part of the system, emphasized here is the handling of unmetered offtakes (end customers with gas meters read annually) while only supply flows are continuously metered.
