For years already the EN 1366-3 "Fire resistance tests for service installations - Part 3: Penetration seals" has been in preparation. The new Düker fire protection coupling BSV 90 is the first solution for cast iron drainage pipes that was tested against this new standard and passed.

This new test standard considers not only the possible transmission of fire and smoke through penetrations in fire-rated ceilings, but also the transmission of  heat.  In part, the pipes penetrating the ceiling in the test assembly are only short pipe pieces that are left open on both sides. This assembly and the relatively high test pressure in the fire zone create a chimney effect in non-combustible pipes, which will lead to an immense transmission of fire, heat and smoke. 

Anyone understands that this test assembly does not have much in common with the practice in buildings. Nevertheless, pipe sealing systems will have to pass this test in the future in order to be approved like the Düker BSV 90.

Inside the fire protection coupling, the cast iron pipeline is interrupted by a plastic collar. The intumescent material around it multiplies its volume in case of a fire. The heat of a fire makes the plastic collar melt away and the intumescent material expand. The result: the pipe is obstructed completely.

The expanded material assures a thermal insulation. It prevents excessive heat transmission as well as the chimney effect described above.

An additional strip of intumescent material on the outside of the steel casing is positioned in the ceiling penetration and thus guarantees the complete closure of the penetration in case of a fire.