6/1/2023 0 Comments Ansi isa 75.01.01 pdfThe results show that in partially filled pipe flow, the discrepancies in pressure between different measurement locations in the valve downstream are significant at valve openings less than 30%. ![]() This paper presents the comparison of the pressures at different locations along with the upstream and the downstream of the valve with the values at recommended positions by the ISA standard. International Society of Automation (ISA) recommends locations for measuring pressure drop of the valve to determine its flow coefficient. This helps to study the effect of bubbles induced by the globe valve on pressure distribution and valve flow coefficient. The shadowgraph imaging technique is applied to illustrate the unsteady flow inside the transparent valve. ![]() In the present study, the bubble formation mechanism in a globe valve with 90% water fraction flow is explained by visualization study and pressure oscillation analysis. Air bubble entrainment is a phenomenon that can significantly reduce the efficiency of liquid motion in piping systems.
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