Pipe flow velocity calculation for a specified pressure drop       |POLVER05_3
f(fF) = fF-1/(2.28-4*log(eps/D+4.67/(Re*fF^0.5)))^2  #
f(u) = 133.7-(2*fF*rho*u*u*L/D+rho*g*200)/(g*144)  #
L=6000   #
D=0.505   #
rho=53   #
g=32.2   #
eps=.00015   #
Re=rho*D*u/(13.2*0.000672)   #
fF(0)=.1 
u(0)=10