2550 KB22 KB201320252018Bergant, AntonKaradžić, Urošletnik:11številka:iss. 2str. 11-22COBISSID:1024327004ISSN:1855-5748URN:URN:NBN:SI:doc-FOHQJRN8enFakulteta za energetikoJET on-lineJournal of energy technologycevovodemptyingfillinginstrumentationpipelinepolnjenjepraznjenjeraziskaveresults of measurementsExperimental investigations of pipeline filling and emptying in a small-scale apparatus| Eksperimentalne raziskave polnjenja in praznjenja cevovoda malih izmer|This paper serves as a reference for further investigations of pipeline filling and emptying in a relatively small-scale pipeline apparatus. The apparatus consists of an upstream end high-pressurized tank, horizontal steel pipeline, four valve units positioned along the pipeline including the endpoints, and a downstream end tank. The filling of an initially empty pipeline is performed by a sudden opening of the valve positioned at the high-pressurized tank filled with water. The pipelineemptying process is accomplished by high-pressurized air supplied from the air reservoir installed at the high-pressurized tank. The high-pressurized tank is closed, and the downstream end valve is opened. Experimental results indicate that pressure fluctuations are larger for pipeline filling in comparison to pipeline emptying. It is shown that a piezoelectric transducer with a fixed relatively low discharge time constant is not entirely appropriate for accurate low-frequency pressure measurementsPrispevek daje osnove za nadaljne raziskave polnjenja in praznjenja cevovoda relativno malih izmer. Preizkusno postajo sestavljajo gorvodna visokotlačna posoda, horizontalni jekleni cevovod, štirje bloki z ventili vgrajeni vzdolž cevovoda in robovih ter dolvodna posoda. Polnjenje praznega cevovoda izvedemo s hitrim odpiranjem ventila, ki je vgrajen pri gorvodni visokotlačni posodi napolnjeni z vodo. Praznjenje cevovoda napolnjenega z vodo dosežemo z vpihovanjem komprimiranega zraka na gorvodnem koncu. Visokotlačna posoda je pri tem zaprta, dolvodni ventil pa odprt. Rezultati meritev kažejo, da so tlačne obremenitve večje pri polnjenju cevovoda. Izkazalo se je, da piezometrično tlačno zaznavalo z relativno nizko tokovno konstantno ni najbolj primerno za merjenje nizkofrekvenčnih tlakovTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Mariboru, Fakulteta za energetiko