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Hydraulic ram pumps have been implemented and installed mainly in hilly or remote area where they are facing public electrical supply problem. Hydraulic ram pumps are mechanical pumps that utilize the increased water hammer due to the sudden shutdown mechanism of the waste valve. Therefore, the hydraulic ram pump is equipped with air vessel to reduce the pulsation of the pumping water flow. Within a certain period of hydraulic ram pump operation, the amount of air present in the air vessel will continue to decrease. In order to replace the air volume in the air vessel, the hydraulic ram pump is equipped with a sniftervalve. However, in its implementation, this valve is only a hole with a diameter of 1 ÷ 2 mm at a distance of about 2 cm below the delivery valve on the body of the hydraulic ram pump. However, there has not been any reference for determining the diameter of the snifter-valve hole yet. Therefore, in this study, works carried out for investigating the magnitude of the increased pressure that occurs in the air vessel of hydram pump. In this study, a hydraulic ram pump equipped with a snifter-valve with various orifice diameters of 0.5, 1.0, 1.5, 2.0 and 2.5 mm. The results show that for the hydraulic ram pump model with 11⁄4 inch diameter of the drive pipe that tested, the incrising pressure in the air vessel is about 0.4 up to 0.5 bar. The snifter-valve with 1.5 mm orifice diameter generates the highest incrising pressure of water hammer pressure in the air vessel, therefore, it gives the maximum work in the hydraulic ram pump.

Pengaruh Diameter Lubang Snifter-Valve Terhadap Peningkatan Tekanan Dalam Tabung Udara Pompa Hydram