What should be avoided while the tank is under pressure?

The correct answer emphasizes that tank ends, man-ways, and fittings should be avoided while the tank is under pressure due to safety concerns. When a tank is pressurized, any incident involving these components can lead to dangerous situations, such as leaks or ruptures, which can result in hazardous material release, explosions, or injuries.

Tank ends, man-ways, and fittings are critical points in the integrity of the tank structure. Exerting pressure near these components can compromise their secure seals and connections, which are essential for maintaining the tank's integrity and safety. By avoiding any interaction or inspection of these parts while the tank is under pressure, operators protect not only themselves but also surrounding environments from potential accidents.

The other options involve actions that may be considered during appropriate conditions, but they can lead to significant risks if performed while the tank is pressurized. Opening the tank can directly expose people and the environment to hazardous materials, while disconnecting power or inspecting surrounding areas may not specifically address the critical dangers posed by pressure at the tank connections. Hence, avoiding engagement with the tank components themselves is paramount while it remains pressurized.