The foam bladder tank is the main unit of the foam extinguishing system. The foam tank and the low/medium expansion foam generator construct the low/medium foam spraying system. It can also construct the high expansion total flooding extinguishing system with high expansion foam generator. It aims at fire of class A and class B, especially for fire of class B. The foam bladder tank mainly applied in occasions such as places where inflammable liquid was produced, stored and transported.

The bladder bag is the accessory of foam bladder tank, which is a compressible bladder. It is used to store foam concentrate and isolate water. When pressurized water flows into tank to press bladder, foam concentrate was forced out from outlet.