A boilermaker who is hydrostatically testing an exchanger should have which of the following information?

• A. The serial number of the exchanger
• B. Date of last inspection
• C. The correct test pressure
• D. Pump flow rate

Answer: (C)

When hydrotesting an exchanger, the essential piece of information is the correct test pressure to apply. The test is designed to push the exchanger to a specific pressure so you can verify there are no leaks and that the vessel can withstand the intended operating load. That pressure value comes from the design specifications or applicable code and must be followed exactly to ensure safety and compliance. If you don’t apply the correct pressure, you might miss leaks at the right level of stress, or risk damaging the exchanger by over-pressurizing it.

Other details like the serial number are for identification and record-keeping, and the date of last inspection informs maintenance history, but they don’t determine how you set up the hydrotest. The pump flow rate isn’t part of a static hydrostatic test, since you’re evaluating strength and leaks under pressure, not flow characteristics.