What does hydrostatic testing entail in the context of API 650?

• A. Involves checking for corrosion
• B. Involves filling the tank with water to check for leaks
• C. Involves visual inspection of tank walls
• D. Involves measuring structural materials

Answer: (B)

Hydrostatic testing is a crucial procedure in the context of API 650, as it specifically involves filling the tank with water to check for leaks. This method is used to ensure the structural integrity and leak-tightness of welded tanks intended for oil storage. By filling the tank with water, operators can apply pressure against the tank walls, allowing them to identify any weaknesses or defects in the welds and overall tank structure that could lead to leaks when the tank is in service.

This testing is particularly important because it simulates the actual conditions the tank will face when filled with liquid. During the test, any leaked water would indicate a failure point in the tank, which must be addressed before the tank can be certified for use. This method not only helps in ensuring safety but also compliance with industry standards outlined in API 650.

The other options relate to important aspects of tank maintenance and inspection, but they do not accurately describe the hydrostatic testing process as it pertains to API 650. Checking for corrosion, visual inspections, and measuring structural materials are all important but represent different inspection protocols rather than the specific purpose of hydrostatic testing.