In the Technical Paper No. 410 of Crane: Flow of Fluids,

in the Example 4-11…. Flat Heating Coils-Water, we have:

In point 4. For seven 180º bends,

KB = 7 [(2-1) (0.25 x 0,023 x 4) + (0.5 x 0.32) + 0.32] = 3.87

but in function of equation 2-20 and the include example in the page 2-13, we can:

7 bend 180º= 14 bends 90º, then,

KB = (14-1)[(0.25 x 0,023 x 4)+(0.5 x 0.32)]+0.32 = 3.33

then,

KTOTAL= 4.87+0.64+3.33 = 8.84 and,

delta P = 0.00225 x 8.84 x 971.8 x 60^2 / 26.6^4 = 0.139 bar (=2.017 psi)

and not 0.152 bar (= 2.205 psi)

I know is little error, but 16.2% of difference in KB counts.

Napo.