User Manual

Fire Safety and security measures

Building Technologies A6V10283843_a_en

Fire Safety & Security Products 05.2010

Gravity operated flaps, this is the option recommended by Siemens:

Fig. 56 Gravity operated flap

Advantage: gravity flaps offer the highest reliability

Disadvantages: medium efficiency, to overcome this, larger flaps need to be cal-

culated to ensure the correct free air space is provided.

…or alternatively they can be operated electrically:

Fig. 57 Electrically operated flap

Of all possible relief flaps, the electrically operated are the less recommended by

Siemens. The reliability of gravity and pneumatic flaps is higher and therefore pre-

ferred.

Important: Some electrically operated flaps open slowly and close very quickly,

but this is the opposite of what is needed for an inert gas discharge!

Possible solution:

– The vent must be timed to be fully open by the time that the system discharges

– The vent must then be timed to remain open for around 50 to 60 seconds

– The vent can then begin to close

– Other functions of the system should also be considered Abort /Hold button!!!!

Overpressure flap

Gravity operated

Overpressure flap

Electrically operated

Overpressure flap