DanHalen
Well-known member
I'm working on designing a new pump station and in my analysis I ran across a burning question. In textbooks, pipe, and pump manufacturers literature they provide minor loss coefficients, K, for common fittings. Where do the K numbers come from in the tables? I ask because I want to know what the K values are for a 22.5 and 11.25 bend and a plug valve. How would I go about getting the K value for reducers? On the projects I'm working on I have a 12"x8" reducer and 8"x6" reducer and don't know what the K value is so that I can get the equivalent length. I know in the future I will run across this again as I select different size reducers.
A colleague I work with uses slightly different method, L/D. Those values are different than what you see with K values. Even with that method I still don't have all the values I need. I have values for 90 and 45 degree bends not 22.5 or 11.25. L/D tables we have do not cover reducers either. Have any of you created a spreadsheet where you calculated your own K or L/D tables? TIA.
A colleague I work with uses slightly different method, L/D. Those values are different than what you see with K values. Even with that method I still don't have all the values I need. I have values for 90 and 45 degree bends not 22.5 or 11.25. L/D tables we have do not cover reducers either. Have any of you created a spreadsheet where you calculated your own K or L/D tables? TIA.
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