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LFOM Entrance Tank Mathcad Code Documentation

Mathcad Code

The mathcad code can be found here. You will need to have mathcad installed on your computer in order to open the file.

Variable Description: in order of appearance in code

Variable Name

Variable Description
Unknown macro: {latex}

$$ N_

Unknown macro: {Lfom}

$$

Number of riser pipes
Unknown macro: {latex}

$$ K_

Unknown macro: {Rm}

$$

minor loss coefficient for rapid mix
Unknown macro: {latex}

$$ A_

Unknown macro: {LfomOrificeTotal}

$$

Combined area of all orifices
Unknown macro: {latex}

$$ A_

Unknown macro: {Orifice}

$$

function for determining the orifice areas as the vertical distance on the riser pipe increases
Unknown macro: {latex}

$$ HL_

Unknown macro: {Lfom}

$$

headloss through the Lfom, and the minimum height of the water in the entrance tank
Unknown macro: {latex}

$$ Pi_

Unknown macro: {VenaContractaOrifice}

$$

minor loss coefficient for an orifice (was K orifice)
Unknown macro: {latex}

$$ Q_

Unknown macro: {Plant}

$$

plant flow rate
Unknown macro: {latex}

$$ ID_

Unknown macro: {Lfom}

$$

the inner diameter of the riser pipe
Unknown macro: {latex}

$$ Pi_

Unknown macro: {LfomOrificeArea}

$$

ratio of LFOM pipe area to orifice area
Unknown macro: {latex}

$$ ND_

Unknown macro: {Lfom}

$$

nominal diameter of the riser pipe and rapid mix pipe
Unknown macro: {latex}

$$ EN_

Unknown macro: {PipeSpec}

$$

enumerated type of pipe
Unknown macro: {latex}

$$ HL_

Unknown macro: {Rm}

$$

rapid mix head loss
Unknown macro: {latex}

$$ L_

Unknown macro: {RmPipe}

$$

The total pipe length betweeen the bottom of the orifices and the flocculator
Unknown macro: {latex}

$$ Nu_

Unknown macro: {Water}

$$

viscosity of water through the plant
Unknown macro: {latex}

$$ E_

Unknown macro: {Pvc}

$$

PVC pipe roughness
Unknown macro: {latex}

$$ H_

Unknown macro: {Ramp}

$$

Function based off of ramp functions, this is an incremental function that all ows other funtions to evaluate one level of orifices at a time
Unknown macro: {latex}

$$ B_

Unknown macro: {LfomOrifice}

$$

vertical distance between orifices
Unknown macro: {latex}

$$ Pi_

Unknown macro: {LfomH}

$$

elevation between orifice rows at which the flow is calibrated, a 0 or 1 value. 0 corresponds to the current row and 1 corresponds to the next row
Unknown macro: {latex}

$$ Q_

Unknown macro: {Ramp}

$$

funtion to determine target riser pipe flow, incrementally calculates flows
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