It would be beneficial for you to read them (if you have not already downloaded the PDF files). It is truly an outstanding resource for modelers and modellers all over the world. BUTTERFLY VALVE COMPUTED LOSS COEFFICIENTS Source publication Design of a Francis Turbine for a Small Hydro Power Project in Turkey Conference Paper Full-text available Jan 2010 Kutay Celebioglu. The documentation is fantastically complete, with detailed theory background, process parameters, and fully worked out examples for all of the processes in SWMM5. It is divided into three volumes: Hydrology, Water Quality, LIDs or SuDs, and Hydraulics. fluid density (kg/m3) u m average fluid velocity (m/s) K coefficient in a same pipe section can be added, the pressure drop can then be expressed the following way.
Butterfly valve minor loss coefficient software#
I posted this on the SWMM Group on LinkedIn World Class Software Documentation for SWMM5 from Lew Rossman and Wayne Huber (Hydrology)īased on email inquiries and postings to the SWMM LIst Sever (a fantastic resource hosted by CHI, Inc.), I’ve discovered that many SWMM 5 users are unaware of the excellent documentation on SWMM 5 available on the EPA website at. Note that the larger velocity (the velocity associated with the smaller pipe section) is used by convention in the equation for minor head loss, i.e., 2 LL. More values are listed in Table 8-4 of the engel-Cimbala textbook: Rounding of an inlet makes a big difference. You can send me an email to or and I will do my best to answer your questions. (a) Needle valve, (b) Head loss coefficient depending on the degree of opening A typical needle (piston ring) valve is shown in Figure 3a, while its head. Here are some sample loss coefficients for various minor loss components. Table 3-3: Typical Minor Loss Coefficients Type of form loss The table given below provides the loss coefficients ( K) for various transitions and fittings. K = loss coefficient for the particular fitting involved. Please note that a CV value is not a linear progression so it cannot be extrapolated out just by looking at the values, it is really just meant to give you a comparison flow rate. Where V = mean velocity in the conduit (m/s, ft/s) Below is a table of the flow rates for Butterfly Valves at different opening stages between zero degrees (fully closed) and ninety degrees (fully open). The local (minor) loss associated with a particular fitting can be evaluated by The energy associated with that turbulence is eventually dissipated into heat that produces a minor head loss, or local (or form) loss. Whenever flow velocity changes direction or magnitude in a conduit (e.g., at fittings, bends, and other appurtenances) added turbulence is induced. Friction losses caused by the presence of valves and fittings usually results from disturbances of the flow, which is forced to change direction abruptly to. This is the H2OCalc information for the Minor loss Equations. Same model valve has different coefficient for each diameter. Introduction: H2OCalc is a hydrology and hydraulics calculator sold by Innovyze that has many of the equations and calculation methods used in #InfoSWMM, #ICM and #SWMM5. Head loss due to Transitions and Fittings (Local loss)
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