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1. Q_gal/min / (7.48051948052*60.) = v_ft/s * A_ft2 gpm Flow:

2. V_ft3/s = v * A_ft2 ft³/s Flow

3. A_ft2 = p * d^2_ft/ 4 Flow Area Circ Pipe, full

4. Q_gal/min / (7.48051948052*60.) = v_ft/s * p * d^2_ft/ 4 Combination

5. V_ft3/s = v * p * d^2_ft/ 4

6. Re = d_{cm, m,ft} * v_{cm/s, m/s, ft/s} * r_{g/cm3,kg/m3,lb/ft3} / (m_[_{P=g/(cm*s),dyn*s/cm2], Pa*s,
lbf*s/ft2} * gc) RE, Viscosity Absolut

7. Re = d_{cm, m, ft} * v_{cm/s, m/s, ft/s} / ñ_{St=cm2/s or m2/s or ft2/s =
function of Temperature} RE, Viscosity Kinetic

need:, V (Q) or v, d, ñ, e, d

8. 1 / f^(1/2) = - 2 * LOG(e / d / 3.7 + 2.51 / (Re * f^(1/2))) Friction factor Re>=4000 (Turb)

9. f = 64 / Re Friction factor Re<=2000 (Lamin)

10. hf_ft = f * L / d_ft * v^2/ (2 * g)

darcy w. velocity

11. hf_ft = f * L / d_ft * Q^2/ ((7.48051948052 * 60. * p / 4.)^2. * d^4)/ (2 * g) darcy w. gal/min

12. Q = (hf * ((7.48051948052 * 60. * p / 4.)^2. * 2. * g * d^5) / (f * L))^(1/2) darcy

13. hf_{ft, m} = f * L / d_ft * V^2._ft3/s,
m3/s / ((p / 4.)^2. * d^4.)/ (2 * g) darcy w. ft³/s, also metric m3/s

14. V_ft3,-m3 = (hf * ( (p / 4.)^2. * 2.* g * d^5) / (f * L))^(1/2) darcy Flow w. ft³/s, m3/s

15. hl_ft = f * Le / d_ft * Q^2/ ((7.48051948052 * 60. * p / 4.)^2. * d^4)/ (2 * g) darcy with Equivalent Length and hl = hf + hm

16. hl_{ft, m} = f * Le / d_ft * V^2._ft3/s,
m3/s / ((p / 4.)^2. * d^4.)/ (2 * g) darcy w. ft³/s, also metric m3/s and Le