The Natural Gas Decree (551/2009) lays down all the basic requirements for construction, installation, inspections, use and operational supervision as well as measures to be taken in the event of damage or accident.
Almost all natural gas activity is covered by standardisation, with the relevant standards published as SFS-EN standards. Tukes publishes an annual list of the standards that are regarded as compliant with statutory requirements. (in Finnish).
Tukes has also issued guidelines on the application of the Natural Gas Decree (Tukes-ohje K1-2010, in Finnish). These guidelines aim to clarify how the Decree should be applied.
Instructions for practical operations (in Finnish) can be found in a manual published by the Finnish Gas Association, which provides comprehensive coverage of issues related to natural gas technology.