The theme of this final work is indoor and outdoor hydrant network and its application for fire protection of peoples and property. Indoor and outdoor hydrant network is a very important factor in preventing the spread of fire, especially in the initial phase , because at this stage is the most important to respond quickly and prevent the fire to its negative effects to a minimum which is described below in final work. Fire can significantly expand and evolve from the initial phase into a blazing until fire department arrive, and it is very important to train and equip people who work or live in protected areas which are protected with hydrant network for handling the same, because that way hydrant network has the most impact because the fastest way to extinguish the fire is in initial phase of fire. Also, checking the validity and regular control of hydrant network system , as well as regular training of people and workers, and abidance with statutory requirements which are governing the obligation of installation, design and actual construction of the hydrant network, greatly contributes that the system works in the best possible way if there is a unfortunate situation.