In a blowdown procedure, after opening the outside valve, what must happen next?

During a blowdown procedure, the purpose is to remove sediment, scale, and other impurities from the boiler or vessel to ensure efficient operation and safety. After the outside valve is opened, the next logical step is to open the inside valve. This action allows the blowdown water to escape from the system, facilitating the removal of unwanted materials.

Opening the inside valve ensures that the blowdown process can proceed effectively. By utilizing both valves in the proper sequence, the operator can control the flow of water and sediment without compromising the safety or integrity of the system.

Monitoring pressure levels generally happens throughout the procedure to ensure that the pressure remains within safe limits, but it is not the immediate next step after opening the outside valve. Similarly, closing either valve prematurely would hinder the blowdown operation rather than support it. Thus, opening the inside valve is essential for the procedure to be executed properly.