Darby 3K Fitting Constants

Darby 3K Fitting Constants - 3-K Constants for Loss...

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3-K Constants for Loss Coefficients for Valves and Fittings 0.3 f1 R ei d i n . KK / N K ( 1 + K / D ) =+ Fitting ( L/D) eq K 1 K i K d Elbows - 90 o Threaded, Standard (r/D = 1) 30 800 0.14 4.0 Threaded, Long Radius (r/D = 1.5) 16 800 0.071 4.2 Flanged, Welded, Bends (r/D = 1) 20 800 0.091 4.0 (r/D = 2) 12 800 0.056 3.9 (r/D = 4) 14 800 0.066 3.9 (r/D = 6) 17 800 0.075 4.2 Mitered 1 Weld (90 o ) 60 1000 0.27 4.0 2 W e l d s ( 4 5 o ) 30 800 0.136 4.1 3 W e l d s ( 3 0 o ) 24 800 0.105 4.2 45 o Threaded Standard (r/D = 1) 16 500 0.071 4.2 Long Radius (r/D = 1.5) 500 0.052 4.0 Mitered 1 Weld (45 o ) 15 500 0.086 4.0 2 Welds (22.5 o ) 12 500 0.052 4.0 180 o Threaded, Close Return Bend (r/D = 1) 50 1000 0.23 4.0 Flanged (r/D = 1) 1000 0.12 4.0 All (r/D = 1.5) 1000 0.10 4.0 Tees Through-Branch (as elbow) Threaded (r/D = 1) 60 500 0.274 4.0
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