Orifice center of head formula |
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\( h_c \;=\; \dfrac{ \left( \dfrac{ Q }{ C_d \cdot A_o} \right)^2 }{ 2 \cdot G }\) (Orifice Center of Head) \( Q \;=\; A_o \cdot C_d \cdot \sqrt{ 2 \cdot G \cdot h_c } \) \( A_0 \;=\; \dfrac{ Q }{ C_d \cdot \sqrt{ 2 \cdot G \cdot h_c } }\) \( C_d \;=\; \dfrac{ Q }{ A_o \cdot \sqrt{ 2 \cdot G \cdot h_c } }\) \( h_c \;=\; \dfrac{ \left( \dfrac{ Q }{ C_d \cdot A_o} \right)^2 }{ 2 \cdot h_c }\) |
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| Symbol | English | Metric |
| \( h_c \) = Orifice Center of Head | \( in \) | \( mm \) |
| \( Q \) = Orifice Flow Rate | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) |
| \( A_o \) = Orifice Area | \(in^2 \) | \( mm^2 \) |
| \( C_d \) = Orifice Discharge Coefficient | \( dimensionless \) | \( dimensionless \) |
| \( G \) = Orifice Gravitational Constant | \(lbf-ft^2 \;/\; lbm^2\) | \(N - m^2 \;/\; kg^2\) |
