What is the proper procedure for conducting a pre-installation air test of a steel tank?

The correct procedure for conducting a pre-installation air test of a steel tank involves applying 3 to 5 pounds of pressure and soaping all surfaces. This method is effective because it allows the operator to utilize soapy water to detect any air leaks around the seams and fittings of the tank. When the soapy solution is applied, any leaks will form bubbles at the point of escape, making it easier to identify and address issues before installation.

Applying the appropriate pressure within the specified range is crucial; too little pressure may not reveal minor leaks, while excessive pressure can be dangerous and may exceed the tank’s designed limits. Therefore, the recommended range of pressure balances safety with effective leak detection.

In contrast, other options suggest methods that either do not provide sufficient pressure or do not incorporate a reliable leak detection method. For instance, a visual check without the use of soap is less reliable, as it may not catch small, less visible leaks that soapy water can expose. Similarly, using a vacuum test instead of an air test may not be suitable for all types of inspections and does not effectively check for air leaks specifically.