FIELD: measurement technology.
SUBSTANCE: invention relates to determination of delayed action of automatic tanks for highly flammable fluids. Method involves determining for one linear input of a subsurface fire-fighting system the total length and inner diameters of foamer solution lines, extending from the room with electric drive valves to high-pressure foam generator assembly (HFG), foam lines passing from HFG to rupture membrane and inside the tank. Then the consumption of foamer solution and the foam expansion ratio are determined, after which the time interval needed to fill the foamer solution lines with foamer solution and foam lines – with foam is determined, foam line passing from HFG to the rupture membrane. Value of pressure at which the membrane breaks is determined. It is followed by calculating the time interval needed for pressure in the foam line to reach the value at which the membrane breaks, and calculating the time interval between the membrane rupture and foam filling the foam line inside the tank. Speed of foam floating to the surface of the liquid is calculated and time interval needed for foam to float to the surface of the liquid is calculated. Delayed action of subsurface fire-extinguishing system is defined as the sum of the time intervals needed to fill foam line and foamer solution line, time of increase of pressure in the foamer solution line to the value at which the membrane breaks, time from the rupture of the membrane until foam line filling inside the tank and time of foam floating to the surface of oil.
EFFECT: result of the disclosed method includes higher accuracy of determining the delayed action of a subsurface fire-extinguishing system.
1 cl, 1 dwg
