How to test the sealing performance of a tin bucket?

Method 1: Water Immersion Method (Suitable for rapid testing)

Procedure:

Fill the tin bucket with water to 80%-90% full and tighten the lid.

Place the bucket in a water tank, ensuring it is completely submerged.

Evacuate to 0.068 MPa and maintain for 2 minutes, checking for air bubbles.

Continuous air bubbles indicate a leak; no air bubbles indicate a leak.

Advantages: Simple and intuitive, suitable for batch testing.

Caution: Do not use buckets with easy-tear lids; do not overfill with water.

Method 2: Pressure Testing Method (More Precise, Suitable for critical testing)

Procedure:

Seal the bucket opening with a rubber stopper to prevent air leakage.

Slowly inflate to the standard pressure (e.g., 50 kPa) and maintain for 2 minutes.

Immerse the bucket in water and check for air bubbles.

No air bubbles indicate a leak; air bubbles indicate a leak.

Advantages: Simulates actual pressure; highly accurate for measuring large and medium leaks.

Caution: Do not exceed the pressure limit to avoid deforming the container.

III. Other Methods (Choose as needed)

Decompression Method: Evacuate to 68 kPa, maintain for 1 minute, and observe the water level change. Suitable for detecting small leaks.

Helium Mass Spectrometry: Uses helium gas for measurement; extremely high accuracy, but the equipment is expensive and time-consuming.

Ultrasonic Method: Detects leaks by sound; suitable for complex environments, but requires technical skill.

IV. Suggestions for Choosing a Method

Daily Use: Water immersion method or pressure method; simple and accurate.

Higher Requirements: Use helium mass spectrometry or ultrasonic testing for even higher accuracy.

Safety Precautions: Do not exceed the pressure limit to avoid damaging the container.