Conceptual design of the water supply system for the western area of the City of Rabac

Ovaj rad opisuje izradu idejnog vodoopskrbnog rješenja zapadnog dijela naselja Rabac primjenom programa WaterCAD V8i u vlasništvu tvrtke Bentley Systems. Promatrani dio naselja Rabac odnosi se na četrdeset kućanstava, tri hotela, jedan kamp i jedan industrijski objekt. Cjelokupan sustav dimenzioniran je na način da može zadovoljiti potrebe vodoopskrbe spomenutih potrošača te omogućiti suzbijanje požara u slučaju pojave istog. Kako bi se osigurali minimalni troškovi, u sustavu je osigurano gravitacijsko tečenje vode. Proračunati volumen vodospreme dobiven je kao suma operativne, protupožarne i sigurnosne rezerve, a iznosi 850 m3. Trasa cjevovoda postavljena je okomito na izohipse i duž prometnica koje se pružaju kroz Rabac, a odabrani materijal njegove izvedbe je polietilen visoke gustoće. Glavni opskrbni cjevovod podijeljen je na 3 segmenta. Segment 1 opskrbljuje turističke objekte, a segmenti 2 i 3 stanovništvo i industrijski objekt. Korištenjem programa WaterCAD V8i izrađeni su dijagrami oscilacije vodnih masa u vodospremi i promjene protoka i brzine vode u cijevima. Izvršena je usporedba scenarija stanja bez pojave požara i scenarija stanja izbijanja požara u naselju Rabac i industrijskom postrojenju, u vremenu od 12 do 14 sati. Također, provedena je i usporedba utjecaja različitog materijala cijevi (PEHD, čelik, duktilno željezo) na brzinu vode i radni tlak.This paper describes the conceptual design of the water supply system for the western area of the City of Rabac, using the WaterCAD V8i program owned by Bentley Systems. The observed part of the City of Rabac covers forty households, three hotels, one camp and one industrial facility. Entire system is designed to meet requirements for supplying mentioned consumers with drinking water and for protection in the case of fire breaking out. In order tu ensure minimal costs, system provides gravitational flow of water. Volume of water reservoir was calculated as a sum of operational storage, fire suppression storage and standby storage. Its value is 850 m3. Pipeline route si placed vertically on the isohypses and along the roads in Rabac. Chosen pipeline material is high – density polyethylene. The main supply pipeline is devided into 3 segments. Segment 1 supplies tourist objects, while segments 2 and 3 supply the population and industrial facility. In the WaterCAD V8i program are made charts that show oscillations of water masses in the water reservoir, water flow charts and velocity charts. A comparison of two scenarios was made, where the first includes a condition without the occurance of the fire and second a condition with the occurance of the fire in the City of Rabac and in the industrial facility, in the period form 12 to 14 hours. Also, a comparisson of the influence of different materials (PEHD, steel, ductile iron) on water velocity and working pressures was made