The equipment has documented tests carried out in warm environments at several fire services and rescue schools. A total of 12 tests have been carried out in different compartments from 15-35kvm and with an effect on the fire of approximately 1-5MW. It has been tested in the same set as the Cold cutting extinguisher, in simulated room fire, the ability of the powder to go around corners and obstacles has been tested with the fire in a smaller side room, and in one of the tests the equipment was exposed to the impossible, a car fire in the garage.
Despite the laws of physics, no fire is the same and the conditions vary. Documented tests are still few, but there are some recurring tendencies to observe.
Factors that affect the extinguishing effect are not entirely unexpected: The size of the fire room and how well closed it is, the size of the fire and the temperature in the room during the fire, the amount of extinguishing agent applied and how it is applied.
In all cases, the fire was subdued and the temperature was lowered by about 300 °C. In the garage, the fire was then recovered quickly when the doors were opened early. In the tests where the door has been opened, the time for recovery has been reduced, while the tests where you keep the doors closed a delayed recovery of up to 10min was achieved. It is important to isolate the fire and keep doors closed until water is available.
Since it is usually a closed room where the attack is made and the fire is not necessarily visible, the main goal is to fill the hot smoke with ballast in the form of powder particles and vapor from molten salt. The salt melts at 200 °C and the vapor formed is comparable to water vapor. In order to achieve and maintain the degree of inertia in the fire gases for a while, at least 0.5 kg powder per square meter of the fire room area should be used and the fire room should be relatively well closed. Such concentration makes the smoke non-combustible and can prevent a backdraft from developing. For a normal sized room of 25 square meter, it equals 1st dry chem extinguisher of 12kg. In order to secure and compensate for a poorly isolated fire room, it may be a good idea to empty an extinguisher in the hot smoke just before the entry of smoke divers. If the resources are available to connect a fog nail at the later stage, it can be used for the same purpose, through the same borehole or drill a new one with a steeper angle pointing up in the ceiling.
In order to achieve a recovery time of up to 10 min, a higher amount of extinguishing agent of 1 kg powder per square meter of the fire room area is recommended. For the normal sized room of 25 square meter, it equals 2pcs of dry chem extinguisher of 12kg each. It is then tactical to try to concentrate the latter part of the powder on the hot fire.
An open window does not have to be an obstacle with 24kg of powder, although a completely isolated room is preferable. The attack can then also take place through the open window and the Swedish Powder lance gives you the longer arm and throw length needed to get the powder inside the window frame so that it will not turn in the opening and follow the smoke out immediately. If the effect out through the window very high, it can still be better way to drill in from another window or wall.
The Swedish Powder lance has shown to provide extinguishing effect at a throw length of 12m. However, the concentration of extinguishing agents on the fire is getting worse and thus also the time for recovery. It should be compensated by continuing the attack and emptying more extinguishers.
Material from these documented tests will be presented in shorter films and posted on the Youtube channel “Pulverlansen – The Swedish Powderlance”. The clip below shows tests conducted in Skövde together with the Fire Service in Skövde, Sweden.