Why does a boilermaker use a test tree that has a bleed valve when hydrotesting as exchanger?

Why does a boilermaker use a test tree that has a bleed valve when hydrotesting as exchanger?

• A. To vent air
• B. To drain condensation
• C. To measure pressure
• D. To release steam

Answer: (B)

In hydrotesting an exchanger, you want to purge non-condensable gases and remove any condensate that forms as the system is filled and then cooled. A bleed valve on the test tree gives a controlled outlet at a low point so condensate can be drained without losing the entire test pressure. Removing that condensate prevents flotation of liquid pockets that could distort pressure readings or mask leaks, and it helps avoid pressure fluctuations or water hammer during the test. The other options aren’t as fitting: venting air is typically done with dedicated vents, measuring pressure requires a gauge, and releasing steam isn’t part of a liquid-filled hydrotest.

In hydrotesting an exchanger, you want to purge non-condensable gases and remove any condensate that forms as the system is filled and then cooled. A bleed valve on the test tree gives a controlled outlet at a low point so condensate can be drained without losing the entire test pressure. Removing that condensate prevents flotation of liquid pockets that could distort pressure readings or mask leaks, and it helps avoid pressure fluctuations or water hammer during the test. The other options aren’t as fitting: venting air is typically done with dedicated vents, measuring pressure requires a gauge, and releasing steam isn’t part of a liquid-filled hydrotest.