Pressure Drop Challenge
Plumbing / WaterSize the pipe so the fixture gets the pressure it needs.
CalculationCanvas 2D10 min
Gas Line Check
Sizing, pressure tests and the discipline that keeps gas where it belongs.
Difficulty: IntermediatePlay time: about 12 minutes
Play Gas Line Check nowOpens the full-screen game - or play in place below.
Workplace narrative
A new gas line feeds three appliances and the inspector arrives this afternoon. Before anyone turns a valve, the numbers have to be right: the total load in BTU per hour, the test pressure the line must hold, and the order of every leak test. Gas work has one speed - careful - and the tradesperson who knows the procedure is the one the inspector trusts.
Why this skill matters
Load calculation and leak-test discipline are the foundation of gas fitting. Strong performance supports the Gas Technology and Heating pathways.
Learning objectives
- Sum appliance loads in BTU/hr
- Convert between inches of water column and pascals
- Set the correct test pressure for a gas installation
- Order the leak test, purge and light-up procedure safely
Equipment and components
Natural gas piping (black iron)Three appliances: 40k, 60k and 30k BTU/hrManometer and pressure gaugeLeak detection solutionShut-off valves and test fittingsCombustion air openings
Technical principles
- Gas load is summed in BTU/hr - the pipe must deliver peak demand
- Low-pressure gas is measured in inches of water column (1 in w.c. = 249 Pa)
- Every new installation is pressure-tested before it ever sees gas
- A gas smell means evacuate and call - never operate switches
How to play
- Sum loads carefully before sizing anything
- Convert pressure units with the stated factor
- Set the test pressure on the gauge and check the band
- Order every step the way the code and the inspector expect
Rules
- Each question is worth 10 points plus streak bonuses
- Hints cost 3 points
- Pass each level with 70% or more
Formula and calculation section
Pressure Conversion
1 in w.c. = 249.1 Pa
Inches of water column are the everyday unit of low-pressure gas systems.
Total Load
Load_total = sum(BTU/hr per appliance)
Peak simultaneous demand decides the pipe size.
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Play right here
The full game runs on this page - no account, no install. Or open the full-screen play mode with the button above.
Level 1/2Score 0Streak 0Hints 0
Your shift briefing
A new gas line feeds three appliances and the inspector arrives this afternoon. Before anyone turns a valve, the numbers have to be right: the total load in BTU per hour, the test pressure the line must hold, and the order of every leak test. Gas work has one speed - careful - and the tradesperson who knows the procedure is the one the inspector trusts.
Feedback approach
Explanations state the reason behind every procedure - gas work has no 'because I said so', only physics and code.
Common mistakes
- Forgetting to include every appliance in the load sum
- Testing with gas instead of air
- Skipping the soap test after the pressure test
- Purging a line with the ignition sources live
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Keep learning
Return to the Gas Technology hub to see the full skill path.