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  • This text about the effect of slope angel variation inner pipe diameter on the fittings to centrifugal pump output. This research aims to get value of energy produced in a centrifugal pump instalation with slope angel variation inner pipe diameter method installed in the fittings. And also to find out amount of power that will be produced in testing centrifugal pump instalation single operated. From the research conducted using pump with a water pump type electric powered of 5 meter static head. This research was conducted by collecting data such as : flow discharge (Q), high pressure (h), velocity flow (v), time (s), and head loss (H), data collected and calculated to know pressure loss, variation of discharge change and loss coefficient. From result of research got that biggest head loss value found in pipe slope angel inner diameter 90° with 50% valve opening that is equal to 6,256 m. Conversely the smallest head loss value is found in pipe slope angel inner diameter 90° with 25% valve opening that is 3,665 m. While the total head obtained from each pipe , in the pipe that have a slope of inner diameter 30° has the largest total head of 5,917 m with 100% Valve opening. In the pipe that has a slope angel of inner diameter 90° the largest total head at 50% opened valve is 6,256 m.