What you learn today
- Read a pipe analyzer
- Pressure, temperature and TotalMoles
- Estimate the fill level
How full is the oxygen tank? A question that can decide over life and death – and one the tank itself does not answer.
Tanks have no data port
The tanks you build today are part of the pipe network: they have no data port and no logic. So you measure with a pipe analyzer (StructurePipeAnalysizer) on the pipe leading into the tank. Tank and pipe form one network, the analyzer sees both.
| LogicType | Meaning |
|---|---|
Pressure | network pressure in kPa |
Temperature | temperature in K |
TotalMoles | gas amount in the network in mol |
Volume | network volume in litres |
RatioOxygen … | gas shares |
A small tank holds 6000 litres, a large one 50,000 litres, a pipe piece 10 litres.
Pressure deceives
Pressure depends on amount and temperature. If the tank stands in the sun, the pressure rises although not a single mole was added. At night it drops again. Whoever fills by pressure overfills in the cold – and the next noon the tank is too full.
TotalMoles is more honest: that is the actual content, however warm it is.
Estimating the fill level
A tank has no built-in fill level. You decide what “full” means and compute the share:
lbn press ANALYZER HASH("Tank") Pressure Average
div share press FULL # e.g. FULL = 10000 kPa
clamp share share 0 1
sbn DISPLAY HASH("Tankstand") Setting share # Mode PercentThe limit
Gas pipes and tanks hold up to 60,795 kPa, from about 48,636 kPa they count as stressed. Plan your targets well below that. Liquids have a separate, much lower limit – and there pressure is no measure of “full” at all.
A tank that has warmed up can climb over the limit without a single pump stroke. Leave enough room between target pressure and limit for the noon sun.
A display in Percent mode takes the share from 0 to 1 directly – no mul 100 needed.
Diagram
Exercise
Task
A tank display. On the network: pipe analyzer “Tank”, LED displays “Tankstand” and “Tankinhalt”, flashing light “Tankgrenze”.
- “Tankstand”: pressure / 10000 kPa, limited to 0 to 1, Mode Percent.
- “Tankinhalt”:
TotalMoles, ModeDisplayMode.Mol. - “Tankgrenze” on above 48636 kPa or when the analyzer is missing; then “Tankstand” shows 0.
Hints
Hint 1
Set both modes once before the loop.
Hint 2
Share: div, then clamp share share 0 1.
Hint 3
Warning: sgt against STRESSED, snan with or; on NaN set the share to 0 with select.
Quiz
4 questions. You pass from 60 % – the server does the grading.
Complete the day
- Passed the simulator exercise
- Passed the quiz with at least 60 %
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