What is important to note about pressurized inlet or discharge caps?

What is important to note about pressurized inlet or discharge caps?

• A. NEVER remove inlet or discharge caps unless no pressure is trapped. Caps that don't easily move are likely under pressure.
• B. Always remove caps immediately to relieve pressure.
• C. Caps never under pressure.
• D. Only remove caps when the engine is running.

Answer: (A)

Pressure can build up in inlet and discharge caps when a pumper is running or being primed, so removing a cap while there’s trapped pressure can cause a dangerous release of hot fluid or steam. The best approach is to treat any cap that doesn’t turn easily as likely under pressure and not force it open. To do it safely, shut the pump off and depressurize the line first: close the valves on that line, open a relief or drain valve to vent the pressure slowly, and confirm the line is depressurized. Only then is it safe to remove the cap, with appropriate protective gear. This prevents injuries from a sudden pressure release.

Pressure can build up in inlet and discharge caps when a pumper is running or being primed, so removing a cap while there’s trapped pressure can cause a dangerous release of hot fluid or steam. The best approach is to treat any cap that doesn’t turn easily as likely under pressure and not force it open. To do it safely, shut the pump off and depressurize the line first: close the valves on that line, open a relief or drain valve to vent the pressure slowly, and confirm the line is depressurized. Only then is it safe to remove the cap, with appropriate protective gear. This prevents injuries from a sudden pressure release.