Question

Safety valves shall operate without chattering and shall be adjusted to close after blowing down not more than:

a) 4% but not less than 2 lbs psi
b) 3% but not less than 4 lbs psi
c) 6% but not less than 4 lbs psi
d) 10% but not less than 2 lbs psi

Answer 1

The subject of this question is Engineering and it discusses the operation and adjustment of safety valves. The correct answer is option (a) 4% but not less than 2 lbs psi.

Step-by-step explanation:

The subject of this question is Engineering. It is discussing the operation and adjustment of safety valves. Safety valves are commonly used in engineering systems to prevent excessive pressure buildup and protect equipment from damage.

The question specifies that the safety valves should operate without chattering, which means they should open smoothly and not produce any rapid oscillations. Additionally, the valves should be adjusted to close after blowing down not more than a specific percentage and not less than a specific pressure.

The correct answer based on the options provided is (a) 4% but not less than 2 lbs psi. This means that the safety valves should close after releasing a maximum of 4% of the system's pressure, but not at a pressure less than 2 lbs psi.