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V prispevku poudarjamo pomembnost neoporečnosti vseh naprav v simulacijskih centrih in prikazujemo primer uhajanja dušikovega oksidula (N2O) skozi poškodovan urejevalnik tlaka. Nepravilnost delovanja urejevalnika tlaka (reducirnega ventila) je bila prikrita dalj časa, zato je dušikov oksidul uhajal počasi ter neopazno. Podrobnejši pregled z milnico je odkril uhajanje plina skozi majhno šobo na zadnji strani urejevalnika tlaka. Uhajanje je bilo sicer neslišno, vendar ga je bilo mogoče občutiti že s pritiskom prsta na šobo ventila. Predlagamo pazljivost pri uporabi reducirnih ventilov in obvezni tlačni preskus celotne plinske napeljave, tudi če ni zelo dolga. Priporočamo, da uhajanje plina enostavno preverjamo s pritiskom prsta na morebitnih odprtinah ventilov ali spojih ceveh, in sicer tako na simulatorjih kot tudi v stvarnih razmerah. In the article, we emphasize the need for all equipment in a simulation centreto be maintained in excellent working condition, and present a case of nitrous oxide (N2O) leakage through a damaged pressure regulator. For a considerable time faulty operation of the pressure-reducing valve went unnoticed, resulting in slow, imperceptible leakage of gas from the cylinder. A careful soap test revealed that gas was escaping through a small nozzle on the back of the pressure regulator. The leakage was inaudible but could be felt by placing a finger on the valve nozzle. Great care must be exercised when using reduction valves, and pressure testing of the entire circuit is mandatory even if the system is small. We recommend a simple test for gas leakage, performed by placing a finger on possible openings in valves or connecting tubes, which is suitable for use both in a simulation centre and inreal circumstances. |
