When operating a boiler at 100 psi or above, what is the minimum number of blowdowns required?

When operating a boiler at 100 psi or above, it is essential to perform at least two blowdowns. This practice is crucial for maintaining the boiler's efficiency and safety. Blowdowns help in controlling the concentration of impurities in the water, which can lead to scale formation and corrosion inside the boiler.

By conducting two blowdowns, operators can effectively reduce the levels of dissolved solids and help ensure optimal water quality. The first blowdown typically addresses the water that has accumulated in the boiler, while the second is usually performed at a different point to ensure that any sediments or impurities are adequately removed from the system.

Regular blowdowns at this pressure level are mandated not only for operational efficiency but also for safety reasons, as excessive impurities can raise the risk of boiler failure or accidents. Hence, adhering to the requirement of at least two blowdowns is a best practice in high-pressure boiler operation.