When a safety valve pops, it must relieve pressure without allowing it to rise more than what percentage?

The correct answer indicates that when a safety valve opens to relieve pressure, it should do so without allowing the pressure to exceed 6% of the set pressure. This is critical because safety valves are designed to ensure that pressure remains within safe operational limits.

If the pressure were to rise beyond this threshold before the valve fully opens, it could indicate a failure of the safety mechanism, potentially leading to hazardous situations such as boiler explosions. This stipulation ensures that safety valves respond efficiently and effectively, thus maintaining system integrity and protecting personnel and equipment.

In comparison, options that suggest lower percentages (2%, 4%) do not align with the commonly accepted standards for safety valve operation in high-pressure boiler systems, which recognize that a bit more tolerance—up to 6%—is necessary for effective pressure management without compromising safety.