Answer :
Final answer:
Boilers operating at pressures above 30 psi are required to have two bottom blowdown valves to ensure safety and reliability under high pressure.
Explanation:
The question regarding the requirement of two bottom blowdown valves on boilers is directly related to the safety standards associated with high-pressure boiler operations. The correct answer is B) 30 psi. Boilers operating at pressures above 30 psi are required to have two bottom blowdown valves. This is a safety measure aimed at ensuring the reliable and secure operation of boilers under high pressure. Having two valves ensures that if one fails or requires maintenance, the second can still function, minimizing the risk of accidents or failures in the boiler system.
