(1) Obtain the static (Co) and dynamic capacity (C) of bearing from PSG data book.

(2) Correct (i.e reduce) the capacity if the higher operating temperature is given, using the temperature correction factor from PSG4.2

(3) Determine the values of X and Y, the radial and thrust factors, from the data book. The values of X and Y factors for all bearings are given in PSG4.4

For DGBB the values of X and Y depend upon two ratios, (Fa/Fr) and (Fa/Co). For all other bearings, the values of X and Y depend upon (Fa/Fr) only.

(4) Calculate the equivalent dynamic load from the equation. $P = (XVFr + YFa)S$

V=race rotation factor (1 for inner race rotating and 1.2 for outer race rotating)

S=service factor (PSG4.2)

(5) Determine the life of bearing $\left(\mathrm{L}_{10}^{\prime}\right)$ using $\mathbf{C}=\mathbf{P} \left(\mathbf{L}_{10}^{\prime}\right)^{1 / k},$ at 90$\%$ probability of survival.

(6) Determine the life $L(mr)$ in million revolutions with a given probability of survival (p).

$\frac{L}{L_{10}^{\prime}}=\left\{\frac{\ln \left(\frac{1}{p}\right)}{\ln \left(\frac{1}{P_{10}}\right)}\right\}^{\frac{1}{b}}$ where $\ln \left(\frac{1}{P_{10}}\right)=\ln \left(\frac{1}{0.9}\right)=0.1053,$ Hence $\frac{L}{L_{10}^{\prime}}=\left\{\frac{\ln \left(\frac{1}{p}\right)}{0.1053}\right\}^{\frac{1}{b}}$

(7) Determine the bearing life in hours using $L(m r)=\frac{L_{h} \times 60 \times N}{10^{6}}$