... nameplate hp the ser- 138 Rules of Thumb for Mechanical Engineers Per Equations 8 and 9: F = 1.0 x 5 .26 = 5 .26 in. D = 5 .26 x 5.0 = 26 . 32 in. 5 .26 + 26 . 32 2 C= = 15.79 in. ... 18.8 19.7 24 .4 25 .0 31 .2 29 .2 36 .2 34.8 48.9 46.0 59.3 58.1 71.6 68.5 92. 5 86.0 11 2. 0 11 4.0 139.0 1 42. 0 167.0 168.0 21 7.0 1.5 2. 0 2. 2 2. 6 3.0 3 .2 3.9 4.8 6.3 ... 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1 ,20 0 1,800 1.9 2. 0 2. 5 2. 8 2. 9 3.5 4.7 5.1 7.1 7.6 9.7 10.5 12. 7...