RESUMOO objetivo deste trabalho foi avaliar um carneiro hidráulico construído com conexões roscáveis de PVC roscáveis e metálicas e garrafa de polietileno tereftálico (PET). O estudo foi realizado no Laboratório de Hidráulica da Universidade Federal de Lavras, MG. Testaram-se tamanhos de câmaras de ar (0,6 e 2,5 L), diâmetros de furos da tampa da garrafa (5, 15 e 25 mm), tipos de garrafa plástica (descartável de guaraná e descartável e retornável de refrigerante de cola), e posições da válvula de escape (vertical e horizontal), a diferentes pressões de recalque (48,39 a 483,92 kPa), a cada 48,39 kPa. O desnível do reservatório de alimentação ao carneiro hidráulico foi mantido constante a 4,36 m. Os resultados indicaram que a combinação de características construtivas que possibilitam melhor rendimento, maior vazão recalcada, menor vazão de alimentação e menor desperdício, foi o uso de garrafa PET descartável ou retornável com capacidade de 0,6 L, válvula de escape na horizontal e tamanho de furo de 25 mm na tampa da garrafa. Palavras-chave: avaliação hidráulica, golpe de aríete, garrafa descartávelHydraulic ram pump manufacturer features using alternative materials ABSTRACTTests were conducted at the Hydraulics Laboratory of Universidade Federal de Lavras -UFLA, Lavras, to evaluate a hydraulic ram pump built with PVC and metallic threadable connections, and a bottle made with polyethylene tereftalic, known as PET. The manufacturer features tested were: bottle size (0.6 and 2.5 L), hole size of the bottle top (5, 15 and 25 mm), bottle models (disposable and returnable) and valve positions (horizontal and vertical). The operational hydraulic head was 4.36 m and the simulated pump elevation pressures were 48.39 to 483.92 kPa and 48.39 to 48.39 kPa. The best efficiency, the highest pumped water flow, the lowest operational water flow and the lowest waste water flow were obtained using the 0.6 L PET disposable or returnable bottle with horizontal valve position and top size of 25 mm.
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