wfn217
Chemical
- Aug 11, 2006
- 101
In Crane TP 410, K for a fitting is found by multiplying a number times fT. fT is called the friction factor. Is fT related to the roughness?
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TP 410 FOREWORD said:The fifteenth printing (1976 edition) presented a conceptual change regarding the values of Equivalent Length "L/D" and Resistance Coefficient "K" for valves and fittings [highlight]relative to the friction factor in pipes[/highlight]. This change has relatively minor effect on most problems dealing with flow conditions that result in Reynolds numbers falling in the turbulent zone. However, [highlight]for flow in the laminar zone, the change avoids a significant overstatement of pressure drop[/highlight]. Consistent with this conceptual revision, the resistance to flow through valves and fittings is now expressed in terms of resistance co-efficient "K" instead of equivalent length "L/D", and the coverage of valve and fitting types has been expanded.