The method
Before using the result
- Supply K values for the actual fitting geometry and flow conditions. Example coefficients are illustrative and are not a fitting database.
Worked examples
These original training examples illustrate the method for Master Plumber (MP). Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.
1. Worked example
Build a transparent fitting schedule from documented K values. Separate local losses at elbows and valves from straight-pipe friction.
- Actual internal diameter
- 50 mm
- Volume flow
- 2 L/s
- Fluid density
- 1,000 kg/m³
Supplied fitting schedule
| Fitting | Loss coefficient K | Count |
|---|---|---|
| Elbow (example K) | 0.5 | 2 |
| Valve (example K) | 0.2 | 1 |
- Velocity = 1.0185916357881302 m/s.
- ΣK = 1.2; h = 1.2 × 1.0185916357881302² / (2 × 9.80665) = 0.06347910369988971 m.
- Total K: 1.2
- Minor head loss: 0.0634791 m
- Minor pressure loss: 622.5174 Pa
2. Comparison example
Compare a different supplied condition using the same method. For Plumber Conquer, the important check is that the input meaning, units and method assumptions still match the problem.
- Actual internal diameter
- 50 mm
- Volume flow
- 3 L/s
- Fluid density
- 1,000 kg/m³
Supplied fitting schedule
| Fitting | Loss coefficient K | Count |
|---|---|---|
| Elbow (example K) | 0.5 | 2 |
| Valve (example K) | 0.2 | 1 |
- Velocity = 1.5278874536821951 m/s.
- ΣK = 1.2; h = 1.2 × 1.5278874536821951² / (2 × 9.80665) = 0.1428279833247518 m.
- Total K: 1.2
- Minor head loss: 0.142828 m
- Minor pressure loss: 1,400.664 Pa
Check your understanding
1. Which relationship is used?
h_minor = Σ(K × count) v²/(2g).
2. Which assumption should you check first?
Supply K values for the actual fitting geometry and flow conditions. Example coefficients are illustrative and are not a fitting database.
3. How should you verify a different unit system?
Convert every input to the displayed calculation units first. Equivalent physical inputs must give equivalent results; a unit label alone does not convert a number.
Continue with the matching exam topic
This tool connects to Master Plumber (MP) free practice. Work through a question independently, then use the calculation steps to identify where your method differs. The tool stays free whether or not you choose paid preparation.