3) An alternative to equation 8.35a (the Colebrook-White equation) and reading the Moody diagram is the Swamee-Jain equation. Like the Haa land equation (8.35b), it is explicit in f and

does not require iteration. The Swamee- Jain equation is:1225 f=\frac{1.325}{\left(\sqrt\left[\ln \left[\left(\frac{e / D}{3.7}+\frac{5.74}{\operatorname{Re}^{0.9}}\right)\right]\right)^{2}\right.} This equation gives similar accuracy as the Haaland equation in the range of5000

Fig: 1

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