MODELING WATER LOSS OF RING NETWORKS EXTERNAL FIRE WATER SUPPLY

There are presented the problems of ensuring the adequacy of water supply to extinguish large fires on site. On the basis of the hydraulic balance equations, it is possible to determine the cost of the ring with a different number of personnel involved hydrants and taking into account the height differences in the terrain. It is shown that the possibility of solving systems of equations of the hydraulic balance with the use of modern computer systems. Acomparison of water loss of the ring of external fire water supply, according to a certain well-known directories and on the basis of computer modeling is performed. It is shown that guides give overestimated values of water loss, which negatively affects to extinguish real fires. It is presented an example of a calculation for a real ring network in Saint Petersburg. There are formulated proposals for objective estimates of water loss in planning fighting fires.