To safely open the drum vents after the fires are out, the boiler pressure should be approximately within what range?

To safely open the drum vents after the fires are out, the boiler pressure should ideally be within the range of 35-70 kPa (5-10 psi). This range is deemed safe because it ensures that the pressure inside the boiler is low enough to minimize the risk of a sudden release of steam or pressure upon opening the drum vents.

At this pressure level, the risks associated with potential flashing or excessive pressure releases are significantly lowered. Maintaining a controlled and lower pressure allows operators to approach the handling of the boiler with added safety and caution.

Both higher and lower ranges of pressure may pose safety hazards. For example, pressures that exceed this recommended range could lead to dangerous conditions if the drum vents are opened, as there may be a much stronger release of steam or pressure, increasing the risk of accidents such as burns or damage to equipment. Therefore, operating within the 35-70 kPa range serves as a critical safety measure for personnel involved in boiler operation and management.