Various pressures related to heat exchangers

Pc refers to the calculated pressure, which is generally equal to the design pressure; however, in containers with jackets or those designed with a pressure difference, there is a difference between the calculated pressure and the design pressure.

When calculating the wall thickness of the head and the cylinder, Pc refers to the calculated pressure, that is, the design pressure plus the hydrostatic pressure of the liquid column. The hydrostatic pressure varies depending on the location; it can be ignored if it is less than 5% of the design pressure. When reinforcing openings in the cylinder, the design pressure refers to the calculated pressure of the cylinder at that opening, while for reinforcing openings in the tube sheet, the design pressure refers to the calculated pressure of the tube sheet shell at that opening. In calculations regarding the minimum clamping force required for gaskets, Pc denotes the calculated pressure of the flat cover. Usually, only the design pressure plus the hydrostatic pressure of the liquid column is considered; however, when the flat cover is located at the top, the hydrostatic pressure is generally not taken into account. In special cases, other local manager loads may also need to be considered, and in such cases the calculated pressure becomes an equivalent pressure. (This point doesn’t need to be considered by the original poster when doing a regular design.)

Ah, I mean, is it the design pressure of the tube side or the design pressure of the shell side. .

The shell side has its own design pressure, and the tube side has its own design pressure as well.