Here is the report that I have for your inputs:
Pipe pressure drop calculator CALCULATION REPORT
1. volume flow rate (q): q = 8.040907 gpm US
2. weight flow rate (w): w = 58.381325 lb/min
3. pipe length (L): L = 192 ft
4 pipe diameter (D): D = 0.75 in
5. pipe roughness (kr): kr = 0.01 mm
6. density (ρ): ρ = 870 kg/m3
7. kinematic viscosity (ν): ν = 0.68 cSt
8. dynamic viscosity (μ): μ = 5.916E-004 Pas
9. K factor - minor lossed coefficient (K ): K = 0.0
10. velocity (V): V = 1.7798676 m/s
11. cross section area (A): A = 285.02295 mm2
12. friction coefficient (f): f = 0.021173518
13. Reynolds number (Re): Re = 49862.465
14. boundary layer (δ): δ = 0.09259989 mm
15. pressure on the pipe start (p1): p1 = 25 psi
16. pressure on the pipe end (p2): p2 = 12 psi
17. pressure drop (p1-p2): p1-p2 = 13 psi
Important things are - pressures are absolute - if not please use calculator and enter absolute values.
If you have no obstacles in pipe than K = 0. If not you must know number of elbows tees reducers valves pipe entrance and pipe exit.
You have all resistance coefficients at:http://www.pipeflowcalculations.com/resistancecoefficientK/
Kr for stainless pipe I used 0.01 mm.
Used calculator is at: http://www.pipeflowcalculations.com/pressuredrop/