For a watertube boiler with 95 m2 of waterwall surface and a superheated size of 20 m2, what is the minimum required combined relieving capacity for the steam drum safety valves?

To determine the minimum required combined relieving capacity for the steam drum safety valves on a watertube boiler, you can use the formula that relates the surface area of the waterwalls and the superheater to the necessary relieving capacity of the valves. This is typically based on the steam production capacity of the boiler, which is influenced by the heating surface area.

In this scenario, the total heating surface area consists of the waterwall surface and the superheated surface. While specific factors may vary, there are general guidelines within the power engineering field that suggest considering surface area to calculate the safety valve relief capacity.

For a watertube boiler, a common approach is to apply a factor approximately based on the total area of heating surfaces. When you sum up the areas given (waterwall plus superheated), you arrive at a certain maximum capacity that the boiler could theoretically generate under full load.

Given the areas of 95 m² for the waterwall and 20 m² for the superheater, total surface area becomes 115 m². Using standard formulas or tables that specify safe minimum relief capacities in relation to the heating surfaces, you find that the combined relieving capacity that corresponds to this total area can be calculated or identified as 8130 kg/h