Fire fighting installation including a constant power pump unit

In an installation for extinguishing a fire in a unit, the improvements comprising:

• a total number of spray heads (3, 3′, 3″, 3′″) wherein one or more of the spray heads less than the total number of spray heads are activated according to a location of the fire in the unit;
• and
• a drive source (5, 5′, 5″, 5′″) for delivering a flow of extinguishing medium through a pipe system (4, 4′, 4″, 4′″) to the activated one or more less than the total number of spray heads,
• wherein the drive source comprises a pump unit including a pump (50, 50′, 50″, 50′″) and an engine (51, 51′, 51″, 51′″) in order to provide by an effect of the pump unit a pumping pressure for the flow of the extinguishing medium into the activated one or more less than the total number of spray heads, and a control unit (52, 53, 53′, 53″, 53′″) arranged to increase the number of revolutions of the engine when the number of the activated one or more less than the total number of the spray heads increases, in response to a decrease in the pumping pressure submitted to the activated spray heads in such a way that the effect of the pump unit is at least mainly kept constant.

In an installation for extinguishing a fire in at least one carriage of a railway train or a tunnel, the improvements comprising:

• a total number of spray heads (3, 3′, 3″, 3′″) in the at least one carriage of a railway train or a tunnel, wherein one or more of the spray heads less than the total number of spray heads are activated according to the location of the fire in the at least one carriage of a railway train or a tunnel;
• and
• a drive source (5, 5′, 5″, 5′″) for delivering a flow of extinguishing medium through a pipe system (4, 4′, 4″, 4′″) to the activated one or more less than the total number of spray heads,
• wherein the drive source comprises a pump unit including a pump (50, 50′, 50″, 50′″) and an engine (51, 51′, 51″, 51′″) in order to provide by an effect of the pump unit a pumping pressure for the flow of the extinguishing medium into the activated one or more less than the total number of spray heads, and a control unit (52, 53, 53′, 53″, 53′″) arranged to increase the number of revolutions of the engine when the number of the activated one or more less than the total number of the spray heads increases, in response to a decrease in the pumping pressure submitted to the activated spray heads, in such a way that the effect of the pump unit is at least mainly kept constant.

In an installation for extinguishing a fire in at least one carriage of a railway train or a tunnel, the improvements comprising:

• a total number of spray heads (3, 3′, 3″, 3′″) in the at least one carriage of a railway train or a tunnel, wherein one or more of the spray heads less than the total number of spray heads are activated according to the location of the fire in the at least one carriage of a railway train or a tunnel;
• and
• a drive source (5, 5′, 5″, 5′″) for delivering a flow of extinguishing medium through a pipe system (4, 4′, 4″, 4′″) to the activated one or more less than the total number of spray heads,
• wherein the drive source comprises a pump unit including a pump (50, 50′, 50″, 50′″) and an engine (51, 51′, 51″, 51′″) in order to provide by an effect of the pump unit a pumping pressure for the flow of the extinguishing medium into the activated one or more less than the total number of spray heads, and a control unit (52, 53, 53′, 53″, 53′″) arranged to increase the flow of the extinguishing medium when the number of the activated one or more less than the total number of the spray heads increases in such a way that the effect of the pump unit is at least mainly kept constant.