The selection of head needs to consider a number of factors. The first is the requirements of users, followed by the chemical process requirements, the vertical vessels of solid working media more choose cone head, conducive to the flow of working media. The liquid working medium mostly uses elliptical headsor spherical heads. The stirring pressure vessel should determine the shape of the head according to the shape of the paddle and the flow of the working medium.

Also according to the pressure, the pressure vessels in the low and middle pressure use elliptical head. The pressure vessel of high pressure and ultra high pressure chooses spherical head. Of course, it also determined by considering the situation of stress. If a large hole is opened on the stress transition zone of the ellipse head, and the local stress is oversized, the spherical headcan also be used.There is also a rare case where some type of head must be used due to the location of the installation.