Calculation of the transport capacity of a gas pipeline is governed by the laws of fluid mechanics, and particularly the Colebrook formula:
P22 - P12 = A.d.L.λ.Q2/D5
- its diameter (D),
- its length (L),
- its roughness (λ),
- the nature of the gas, characterised by its density (d),
- the grid operating parameters (pressure at the system entry (P2) and exit (P1) points).
Calculating the capacity of a natural gas transport network like Teréga’s is
much more complicated. Simple application of a mathematical formula to one basicsection is not enough, because Teréga’s network consists of:
- multiple sections with different characteristics, connected in series, in parallel, or branching;
- many special systems such as compression stations, pre-expansion stations, metering stations etc..
Finally, this complex network is connected at several points to the infrastructures operated by adjacent operators, transporters and storage providers. Each has their own operating constraints which need to be considered when evaluating grid capacities.
To perform those calculations, Teréga models the characteristics of all the elementary systems making up its transport network. From that model, it is then possible to simulate all the supply and consumption situations envisaged by Teréga.