Elliptical heads are used when creating equipment for food, pharmaceutical industry. They are mounted on vessels, tanks, piping and apparatus. The ellipse in the title means that the curvilinear element bottoms in the meridional cross section has this form.

The diffuser (diffuse) bottoms differ from other types of bottoms to its unusual shape. In everyday use, form the "diffuser" is designed for uniform distribution. Whether it is air, water, or other liquids. Bottoms represent a concave spherical end element with flange. They are considered more durable due to the convex inside the metal, this system sets the strength and stiffness. The form is set by two radii of the sphere outside the radius of transition to the cylindrical part from the inside. If you remember, this kind of bottom we could meet, for example, bottles used every day. The bulge in the middle to evenly distribute the pressure on the vessel wall that provides additional strength. Because these bottoms are most often used in the food industry, where diffuse units are indispensable for production.