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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

Unknown macro: {latex}

$$ Q_

Unknown macro: {LfomActual}

$$

funtion to determine actual flow through orifices

Unknown macro: {latex}

$$ n_

Unknown macro: {LfomOrifices}

$$

number of orifices

Unknown macro: {latex}

$$ D_

Unknown macro: {LfomOrifices}

$$

diameter of Lfom orifices

Unknown macro: {latex}

$$ D_

Unknown macro: {Circle}

$$

function that determines the diamter of a circle given the area

Unknown macro: {latex}

$$ D_

Unknown macro: {Drill}

$$

function that determines the drill bit size necessary

Unknown macro: {latex}

$$ N_

Unknown macro: {LfomOrificesFirstrow}

$$

arbitrary value determines the number of orifices in the first row, currently 5 is selected

Unknown macro: {latex}

$$ Q_

Unknown macro: {LfomError}

$$

percent error in the actual flow rate compared to theoretical values

Unknown macro: {latex}

$$ Q_

Unknown macro: {LfomErrorMax}

$$

maximum error of Q_LfomError array

Unknown macro: {latex}

$$ HL_

Unknown macro: {EtFloc}

$$

headloss from the entrance tank to the flocculator

Unknown macro: {latex}

$$ ZW_

Unknown macro: {Et}

$$

water depth of entrance tank relative to the bottom of the sedimation tank

Unknown macro: {latex}

$$ HW_

Unknown macro: {FlocStart}

$$

height of the start of the floculation tank relative to the bottom of the sedimention tank

Unknown macro: {latex}

$$ H_

Unknown macro: {LfomFreefall}

$$

difference between height of water in floculation tank and the bottom set of orifices on the LFOM

Unknown macro: {latex}

$$ HW_

Unknown macro: {Etmax}

$$

maximum water level in entrance tank

Unknown macro: {latex}

$$ HW_

Unknown macro: {Etmin}

$$

minimum water level in entrance tank

Unknown macro: {latex}

$$ H_

Unknown macro: {Et}

$$

height of entrance tank

Unknown macro: {latex}

$$ H_

Unknown macro: {PlantFreeBoard}

$$

heigt of plant free board in the plant tanks

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