Pipe Loss Write Up - University of Florida Department of...

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University of Florida Department of Mechanical Engineering Pipe Loss Lab EML 4304C Written by: Christian Schneider Date: 10/8/2006 ABSTRACT The purpose of this lab was to measure the pressure drop across a series of PVC pipes and measure the head loss, friction factor and loss coefficient. This was done by pumping water through a system of valves and small pipes and then measuring difference in head pressure using H2O manometers. The flow was measured using a rotometer. The friction factors determined by the calculations were then compared against the theoretical calculations for smooth pipe. It was found that the measured values for the friction coefficient where several hundred percent above the theoretical smooth values. The loss coefficient for the elbow section was calculated to be approximately 0.618.
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INTRODUCTION / OBJECTIVE The purpose of this lab was to demonstrate the concepts of major and minor losses in hydronic pipe systems. Water with a known density was pumped through a system of varying size pipes and the relative absolute pressures were measured at known increments around the system. These measurements where then used to calculate the subsequent head losses, friction factors and the loss coefficient of the elbow segment. The friction factors of the straight segments of pipe where compared to those of the theoretical smooth pipes. APPARATUS / PROCEDUE The system as given by the instructor consisted of 2 separate hydronic circuits each fed by a common pump source. The measurements included a segment of small diameter pipe, a segment of large diameter pipe, and a segment of small diameter pipe which included a proprietary 90 deg elbow joint. The gauge pressure at each point were measured by piezometers. The volume flow rate of the system was measured using a rotometer positioned before the flow was separated between each circuit of the system. Necessary Constants: The pipe length: 914.4 mm The pipe diameter of the smaller pipe: 13.6 mm. The pipe diameter of the larger pipe: 26.2 mm. H20 Density: 1000 kg /m^3 Viscosity of H20: 0.001 (1) (2) (3) (4) (8) (9) V2 V1 Main valve 26.4 mm straight pipe (914.4mm) 90 elbow 13.6 mm straight pipe (914.4mm) Pipe length between (1) and (2) is 914.4mm FIGURE 1: Layout of pipe circuits
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TECHNICAL APPROACH (THEORY / ANALYSIS) The head loss for each segment of piping was calculated by the following formulas where delta H is the difference in the piezometers in mm of H20 and the density is assumed as 1000 kg / m^3 ρ p h H p L = = 774 . 9 * The friction factor of the segment was then calculated by using: D L v p f = 2 2 1 This would provide the friction factors for both the large diameter and small diameter pipes circuits. To compare the measured values of the friction coefficient to a pipe which was
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Pipe Loss Write Up - University of Florida Department of...

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