Minnesota Boiler License Practice Exam

When used in blow-off and feedwater lines, valves and fittings rated 125 lbs or more get a reduction in pressure rating of what percent?

1. 10%

2. 15%

3. 20%

4. 25%

The correct answer is: 20%

In the context of blow-off and feedwater lines, valves and fittings that have a rating of 125 lbs or more are subject to a reduction in their pressure rating due to operational conditions and safety factors. When these valves and fittings are used in such applications, a reduction of 20% in their pressure rating is warranted. This reduction accounts for factors like temperature variations, potential for pressure surges, and the dynamic nature of the environment in which these components operate. By applying this 20% reduction, operators ensure that the system remains within safe operational limits, thereby minimizing the risk of failure or accidents. The practice of implementing such safety factors is common in the boiler industry to enhance the reliability and safety of the system as a whole.