It was heated by excess steam bled from the turbines.

The safety valves are set to release excess steam to avoid going above the boiler's maximum working pressure.

Well, if the boiler should ever get too hot, the safety valve releases all the excess steam, and Bob's your uncle.

In addition, the bag features new vents for excess steam to escape.

In addition, the system has a safety release valve to allow excess steam to escape without driving the wheels.

An overflow was required for excess steam or water to discharge, especially during starting.

The booms might have been from an automatic dumping of excess steam, he said.

Some will improve efficiency by building more co-generation plants, which use excess steam from electricity generation as a heat source.

This generated excess steam which had to be removed from the boiler.

The excess steam is also used for other applications.