86. What is the danger if a boiler is brought on the line with its steam pressure much higher than that of the boiler already on the line?

Introducing a high-pressure boiler into a lower-pressure steam line causes a rapid pressure drop, increasing boiling turbulence and leading to priming and carryover, where water droplets are carried with the steam. This can damage downstream equipment and reduce steam quality; therefore, pressures should be equalized before connecting boilers to avoid this issue.