Abstract: A dry sprinkler comprises a tubular body having a connector and a sprinkler head. The connector is adapted to be connected to the water pipe network of the fire suppression system and the sprinkler head is adapted to discharge water or other liquid suppressant. The tubular body defines a flow passage between the connector and the sprinkler head. First and second seals are arranged in spaced relation along the flow passage and contain an antifreeze fluid therebetween. The antifreeze fluid may be a liquid or gas subjected to pressure. A thermally responsive element is arranged to maintain the second seal in a state that contains the antifreeze fluid between the first and second seals. The thermally responsive element releases the second seal when an elevated temperature condition exists.

Abstract: A system and method for continuously producing and maintaining a predetermined proportionate mixture of two fluids, such as water and foam concentrate, in accordance with conductivity measurements of the fluids and the mixture. A set point is established which is representative of the conductivity of the predetermined proportionate mixture, by way of continuously measuring the conductivity of each fluid and feeding data to a microprocessor which calculates the conductivity of the desired proportionate mixture. The conductivity of the mixture is measured and compared with the set point by conductivity probes and a microprocessor. A control valve is continuously adjusted to maintain the predetermined proportionate mixture in response to control signals from the microprocessor in accordance with the comparisons of the conductivity values.

Abstract: A nozzle assembly including a nozzle body having an inlet at a first end and an outlet at a second end. A first fluid passageway is defined within the nozzle body for first fluids passing between the inlet and outlet. Second and third fluid passageways for respective second and third fluids are also defined within said nozzle body. A discharge mixing unit is provided at the second end and is in fluid communication with the first, second and third fluid passageways for mixing the first, second and third fluids to produce a discharge solution. The discharge mixing unit includes one or more mixing chambers provided on the interior surface of the second end of the nozzle body. The mixing chambers are defined between a plurality of inwardly extending blades from the interior surface of the second end. The second end of the nozzle body has an adjustably extending pattern selection sleeve.

Abstract: A system and method for producing and maintaining a predetermined proportionate mixture of two fluids, such as water and foam concentrate, in accordance with conductivity measurements of the fluids. A set point is established which is representative of the conductivity of the predetermined proportionate mixture. The conductivity of the mixture is measured and compared with the set point by conductivity probes and a microprocessor. A control valve is continuously adjusted to maintain the predetermined proportionate mixture in response to control signals from the microprocessor in accordance with the comparisons of the conductivity values.

Abstract: An improved foamable protein hydrolysate based concentrate is provided containing multivalent cations and a water soluble polymer, which remains stable in storage for at least six months and which, when diluted with 10 to 50 parts of water and mixed with air to generate a foam, produces a foam which lasts essentially unchanged for at least three days.

Abstract: AFFF and ARAFFF firefighting foam concentrates which include alkyl polyglycoside surfactants are provided. These surfactants enhance the performance of the perfluoroalkyl surfactants.

Abstract: A method and apparatus for covering substrates such as landfills, sewage, contaminated soil, sludge deposits, compost piles and the like. A protein based solution, preferably mixed from a foam concentrate, is mixed with air in a foam production nozzle and then spread to an approximately uniform thickness over the surface of the substrate.In an alternative embodiment the present invention also relates to a method for providing a foam covering to substrates such as buildings and other natural and artificial structures to protect such substrates from adverse environmental conditions such as polluted air or water, insects, extreme hot and cold temperatures and toxic vapors or substances.

Abstract: AFFF and ARAFFF firefighting foam concentrates which include alkyl polyglycoside surfactants. These surfactants enhance the performance of the perfluoroalkyl surfactants.