An air under water pressure test is a method used to detect leaks in pressurized systems (such as pipes, tanks, or vessels) by submerging them in water and observing for air bubbles. Here’s how it works:
Procedure:
- Pressurize the System – Fill the test object (pipe, tank, etc.) with compressed air to a specified test pressure (usually 1.5 times the working pressure or as per standards).
- Submerge in Water – Lower the pressurized object into a water tank or apply a soapy water solution to joints and seams.
- Observe for Bubbles – If there’s a leak, escaping air will form visible bubbles, indicating the location of the defect.
- Record & Repair – Mark any leaks found, depressurize the system, and repair before retesting.
Advantages:
– Simple and cost-effective.
– Clearly identifies leak locations.
– Non-destructive (if pressure is within safe limits).
Disadvantages:
– Limited to small or accessible components (large tanks may be hard to submerge).
– Risk of over-pressurization leading to rupture (safety precautions are critical).
– Not suitable for high-pressure systems unless proper safety measures are in place.
Safety Considerations:
– Use a pressure regulator to avoid exceeding test limits.
– Wear protective gear in case of sudden failure.
– Follow industry standards (ASME, API, etc.) for test pressures.
Applications:
– Plumbing systems.
– Automotive & HVAC components.
– Hydraulic/pneumatic systems.
– Pipeline fittings.
