Division 4.1.13 Maximum pressure variations in tunnels (BP23)

The design of the interoperable trainsets shall be such that the maximum pressure variation defined in the infrastructure TSI (10 kPa) is never exceeded, even in the event that the pressure sealing of vehicles (when so equipped) fails.

Thus one can define the pressure characteristics of the trainset by a unique envelope curve in order to provide the three pressure variations P0, P1 and P2, which are specified in Annex B.

For reference purposes, the following values are used:

• ΔP0 < or = 1 800 Pa,

• ΔP1 < oder = 3 200 Pa,

• ΔP1 - 0,8ΔP0 < oder = ΔP2.

These values are given by:

• a ratio between the train and tunnel cross-sections of 0,18,

• a service speed of 250 km/h