Group trapping of batch equipments should be converted to individual trapping. Individual trapping lowers process time and reduces steam consumption.
Group trapping describes the use of one trap serving more than one application. Often grouping batch equipments operating at same pressure is considered a feasible option. However in this case, though the equipments operate at the same pressure, a difference exists in their time v/s temperature profiles.
Thus (referring to the diagram below)if equipment A has almost reached its temperature it will condense lesser steam as compared to similar equipments (B, C, D) in the group that have just begun to attain their temperature. So the pressure drop across B, C, and D would be higher. The steam passing through A would flow along the condensate drain line to equalize the pressure at the outlets, in the process impeding condensate evacuation from B, C, and D. Also, the steam trap sensing steam (from A) remains closed, further hampering evacuation.
Inadequate condensate removal leads to higher heating times and thus higher steam consumption. It is recommended to provide individual trapping for equipments to ensure higher process efficiency with reduced steam consumption.