fbPump pmPEM$01$A

Units Selection

Flow gpm

Head

Load kW

Ref. Density

$992\mathrm{.}408$

$k\frac{g}{m}3$

$\backslash$table$[[,$Flow,Head,Load,NPSH$],[0,0,0,0,0],[1,0,0,0,0],[2,0,0,0,0],[=,,,,],[,,,,],[,,,,],[,,,,]]$

Use Curves: $$ Load NPSH

$\begin{array}{cc}\text{P}\text{a}\text{r}\text{a}\text{m}\text{e}\text{t}\text{e}\text{r}& \text{V}\text{a}\text{l}\text{u}\text{e}\\ \text{D}\text{i}\text{r}\text{e}\text{c}\text{t}FResistance& -0\mathrm{.}0030603\\ Fat\text{M}\text{a}\text{x}dP& 0\\ \text{M}\text{a}\text{x}dP& 10\mathrm{.}6411\\ Fat\text{M}\text{a}\text{x}\text{E}\text{f}\text{f}\text{i}\text{c}\text{i}\text{e}\text{n}\text{c}\text{y}& 0\\ Fat\text{R}\text{u}\text{n}\text{o}\text{u}\text{t}& 0\\ \text{R}\text{u}\text{n}\text{o}\text{u}\text{t}\text{C}\text{o}\text{e}\text{f}\text{f}\text{i}\text{c}\text{i}\text{e}\text{n}\text{t}& 0\\ \text{R}\text{e}\text{v}\text{e}\text{r}\text{s}\text{e}FResistance& 0\\ \text{M}\text{a}\text{x}\text{E}\text{f}\text{f}\text{i}\text{c}\text{i}\text{e}\text{n}\text{c}\text{y}& 1\end{array}$Develop a computer model using an appropriate software program $($e$.$g$.$ Excel, Access, Numbers, etc.$)$ to

model the pump for the system you were assigned in Module $1.$ The model only needs to model the

pump. Use the pump curve provided in assignment M$1\mathrm{.}5$ for this assignment. Please note that this

assignment should not use the results of the tests conducted in Modules $1$ or $2.$

Based on the model, calculate the impact of the following changes in the system.

a$.$ Assume that the pump is driven by an induction motor. Starting at normal operating pressure calculate the change in flow and motor horsepower in

$5\%$ steps until the reactor reaches $40\%$ of the original starting pressure. $($Hint: The classic centrifugal pump laws do not work. An electrically driven

pump with an induction motor will run at a constant speed and its flow and power requirement will both increase as the back pressure of the pump