What is a Trolley Fire Extinguisher?
A cart-type fire extinguisher refers to a fire extinguisher equipped with wheels that can be pushed (or pulled) to the fire site by one person and can spray out the contained fire extinguishing agent under the action of its internal pressure to extinguish the fire.
It is mainly composed of a frame, barrel, gas storage cylinder, injection system, and other components; the trolley-type fire extinguisher has the advantages of a larger storage capacity for fire extinguishing agent, higher fire extinguishing efficiency, and convenient operation.
Classification of cart-type fire extinguishers
Classified by filled fire extinguishing agent
- Classification according to the filled fire extinguishing agent:
- Cart-type water-based fire extinguisher;
- Cart-type dry powder fire extinguisher;
- Cart-type carbon dioxide fire extinguisher;
- Cart-type clean gas fire extinguisher.
Note 1: Cart-type water-based fire extinguishers may contain clear water or water with additives, such as wetting agents, thickeners, flame retardants or foaming agents, etc.
Note 2: Dry powder can be BC type or ABC type.
Note 3: The production and use of clean gas fire extinguishing agents are controlled by the Montreal Agreement or national laws and regulations.
Classification according to the type of driving fire extinguishing agent
- Vehicle storage gas cylinder fire extinguisher;
- Cart storage pressure fire extinguisher.
Types of fire extinguishing agents for cart-type fire extinguishers
Carbon dioxide fire extinguishing agent, clean gas fire extinguishing agent, dry powder fire extinguishing agent, foam solution.
Propelling gas for trolley fire extinguishers
The driving gas used for pressure-stored and cylinder-type cart-type fire extinguishers should be air, argon, carbon dioxide, helium, nitrogen, or a mixture of these gases with a maximum dew point of -55°C.
Note: The driving gas used for stored-pressure water-based cart-type fire extinguishers does not need to meet the dew point requirements.
Cart type fire extinguisher fire extinguishing agent filling volume
- Filling density
① The filling density of the cart-type carbon dioxide fire extinguisher should not be greater than 0.74kg/L.
②The filling density of the cart-type clean gas fire extinguisher should not be greater than the designed filling density of the cart-type fire extinguisher cylinder. - Filling error
The filling error of the fire extinguishing agent of the cart-type fire extinguisher shall meet the following requirements:
①Trolley-type water-based fire extinguisher: -5% to 0% of the rated filling capacity.
②Trolley-type dry powder fire extinguisher: -2% to +2% of the rated filling capacity.
③ Cart-type carbon dioxide fire extinguisher and cart-type clean gas fire extinguisher: -5% to 0% of the rated filling capacity. - Rated charging device
The following is the recommended rated filling volume (i.e. specification) of the cart-type fire extinguisher:
①Trolley-type water-based fire extinguishers: 20L, 45L, 60L and 125L.
②Trolley type dry powder fire extinguisher: 20kg, 50kg, 100kg, and 125kg.
③ Cart-type carbon dioxide fire extinguisher and cart-type clean gas fire extinguisher: 10kg, 20kg, 30kg, and 50kg.
Performance requirements for cart-type fire extinguishers
- Applicable temperature range
The operating temperature of the trolley-type fire extinguisher should be within the following temperature range:
+5℃~+55℃;
-5℃~+55℃;
-10℃~+55℃;
-20℃~+55℃;
-30℃~+55℃;
-40℃~+55℃;
-55℃~+55℃. - Effective injection time and injection distance
Effective injection time
① The effective injection time of the cart-type water-based fire extinguisher should not be less than the 40s and should not be greater than the 210s.
②The effective injection time of the cart-type fire extinguishers capable of extinguishing Class A fires other than the water-based type should not be less than the 30s.
③ The effective injection time of the cart-type fire extinguishers that cannot extinguish Class A fires other than the water-based type should not be less than the 20s.
Spray distance
For push-type fire extinguishers capable of extinguishing Class A fires, the spray distance should not be less than 6m. For water-based cart-type fire extinguishers equipped with spray nozzles, the spray distance should not be less than 3m. - Spray performance within the operating temperature range
The cart-type fire extinguisher should be able to operate within the marked operating temperature range and meet the following requirements:
①The cart-type fire extinguisher should be able to operate normally;
② Injection lag time should not be greater than 5s;
③ After complete spraying, the remaining rate of spraying should not exceed 10%. - Intermittent injection performance
For cart-type fire extinguishers, the time from opening the injection control valve to the spraying of the fire extinguishing agent should not exceed 1 second, and the spraying of the fire extinguishing agent should be stopped within 1 second after the injection control valve is closed. After complete spraying, the remaining rate of spraying should not be greater than 10%. - Sealing performance
① For cart-type fire extinguishers and carbon dioxide cylinders driven by the vapor pressure of the fire extinguishing agent, the leakage rate should not exceed the loss rate equivalent to 5% of the rated filling capacity per year.
②The leakage rate of the push-cart pressure storage fire extinguisher filled with driving gas and the gas cylinder filled with non-liquefied gas should not exceed the loss rate equivalent to 5% of the working pressure per year.
③There should be no air bubble leakage for the push-cart stored pressure fire extinguisher and gas cylinder.
Frame and driving performance of cart-type fire extinguisher
Frame components
The frame assembly of the push-type fire extinguisher shall be designed to have the function of fixing and carrying all the components and parts of the push-type fire extinguisher, and when the push-type fire extinguisher is overturned in any direction in the upright position, the barrel of the push-type fire extinguisher Or cylinders, fixing units for spray hoses and all other parts shall be protected.
Fixtures for spray hoses
The spray hose assembly and spray control valve shall be securely secured in a storage box or clamp. In critical situations, the spray hose should be able to be unrolled quickly and easily without kinking.
driving performance
Cart-type fire extinguishers should be designed so that one person can easily push (or pull) them on level ground and slopes with a slope of 2%.
When a cart-type fire extinguisher is stored in a vertical position, the frame should be able to stand firmly on the ground with its support, and it should be able to return to its original position by its weight when it is tilted 10° from the vertical position.
The running mechanism should have sufficient passing performance, and the distance between the lowest position (except the wheels) and the ground during the push (or pull) process should not be less than 100mm.
Fire Extinguishing Performance of Cart-Type Fire Extinguishers
Extinguishing performance of class A fire
The fire extinguishing performance of the cart-type fire extinguishers suitable for extinguishing Class A fire is expressed in grades. Its level code is composed of numbers and letters A, the numbers indicate the number of levels, and the letter A indicates the type of fire. The minimum class A fire extinguishing level of the push-type fire extinguisher should not be less than 4A, and should not be greater than 20A.
The performance of extinguishing class B fire
The fire extinguishing performance of the push-type fire extinguishers suitable for extinguishing Class B fires is expressed in grades. Its level code is composed of numbers and letters B, the numbers indicate the number of levels, and the letter B indicates the type of fire. The fire extinguishing level shall be determined by the method in 7.3, and the level shall be the largest fire that can be extinguished under the test conditions.
The maximum level of the push-type fire extinguisher for extinguishing Class B fires should not be greater than 297B.
The minimum level of class B fire extinguishing for cart-type water-based fire extinguishers and cart-type dry powder fire extinguishers should not be less than 144B.
The minimum level of class B fire extinguishing for cart-type carbon dioxide fire extinguishers and cart-type clean gas fire extinguishers should not be less than 43B.
The performance of extinguishing class C fire
For the fire extinguishing performance of the push-type fire extinguishers capable of extinguishing Class C fires included in this standard, only the push-type dry powder fire extinguishers can be marked as capable of extinguishing Class C fires.