E-CodePump and system operating point — a TI-84 Plus CE program
PUMPSYS is a TI-BASIC program for the TI-84 Plus CE. Parabolic pump curve meeting a system curve, with speed scaling by the affinity laws: flow, head, efficiency from a parabolic curve, and shaft power.
What it asks for and what it shows
It asks for 7 values at its prompts. In the example below it shows Q L/S, H M, EFF, P KW, H0 AT N, BEP L/S.
Example run
One of its oracle test cases: “design speed”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 45 |
| Input 2 | 0.012 |
| Input 3 | 12 |
| Input 4 | 0.02 |
| Input 5 | 0.78 |
| Input 6 | 30 |
| Input 7 | 1 |
| The screen shows | |
Q L/S= | 32.11308145 |
H M= | 32.625 |
EFF= | 0.7761302352 |
P KW= | 13.24240622 |
H0 AT N= | 45 |
BEP L/S= | 30 |
How it's checked
4 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 27 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Pump and system operating point” (PUMPSYS).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Impeller velocity triangles (Euler head)
- Pipe friction: Colebrook, Darcy-Weisbach
- Pipe network: series + parallel
- Venturi meter and Pitot tube
- Open channel: Manning, critical depth
All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs