Pressure Head

Yes, 550mm is the pressure head at B.

Use the following:

p_B + (1/2)*rho*v_B^2 = p_A + (1/2)*rho*v_A^2                   p_B = rho*g*h

v_A*Area_A =  v_B*Area_B

p_B + (1/2)*rho*v_B^2  =  p_C + (1/2)*rho*v_C^2  + (0.15/2)*rho*v_B^2

.

v_C*Area_C = v_B*Area_B

Volume flow rate = v*Area

v is velocity,  p is static pressure

.

Pressure head = p/(rho*g)

Yes Alan, I applied the energy equation, but my question was about h = 550 mm is it the pressure head at B? 

And this is how i solve it, maybe its not clear!

Thanks alot Alan, You are the best