Over what pressure are two boiler blowdowns required?

The requirement for two boiler blowdowns is specifically related to maintaining safe and efficient operation of the boiler system. When a boiler operates at a pressure exceeding 100 psi, the potential for increased concentration of impurities in the water also rises. To mitigate this, two blowdowns are necessary. This process helps to effectively remove sediment and prevent the buildup of contaminants that could lead to operational issues or safety hazards.

In this context, pressures above 100 psi signify the importance of regularly checking and controlling the water quality in the boiler system, ensuring that it functions optimally. Consequently, the emphasis on two blowdowns at this pressure threshold reflects industry standards aimed at promoting safety and longevity of boiler equipment.