All calculations
Leak Rate Through a Hole
The steam, water, air or gas escaping through a hole, crack or orifice — and what it costs in a year.
Unit system
Inputs
Leak rate
22.38kg/h
Flow regime
Choked flow — sonic at the hole. Lowering the back pressure does NOT increase the leak (critical ratio 0.577).
Details
| Annual loss | 179 t/yıl |
| Hole area | 7.069e-6 m² |
| Discharge coefficient Cd | 0.610 |
| Velocity at the hole | 454.6 m/s |
| Upstream density | 5.145 kg/m³ |
| Normal volume flow (0 °C, 1.013 bar) | — m³/h |
Assumptions
- Cd comes from the hole SHAPE, not the fluid. A sharp edge contracts the jet; a corrosion hole is lower still.
- Saturated steam is taken as DRY at the hole. Wet steam gives a somewhat higher mass flow.
- If the hole cannot be measured this is an upper bound, not a measurement — the error in diameter is squared.
Continue with this result
Calculation report
A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.
Source
- ISO 4126-1 · Lüle akış katsayısı C(κ) — boğulmuş ve alt-kritik akış · 2013
- ISO 5167-2 · Köşeli orifis plakası boşaltma katsayısı · 2022
- IAPWS-IF97 (R7-97) · Buhar ve su yoğunluğu · 2007
Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.
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