Shapes
The shape of the heads used can vary. The most common head shapes are:
- Hemispherical head
- A sphere is the ideal shape for a head, because the pressure in the vessel is divided equally across the surface of the head. The radius (r) of the head equals the radius of the cylindrical part of the vessel.
- Ellipsoidal head
- This is also called a 2:1 elliptical head. The shape of this head is more economical, because the height of the head is just a quarter of the diameter. Its radius varies between the major and minor axis.
- Torispherical head
- These heads have a dish with a fixed radius (r1), the size of which depends on the type of torispherical head. The transition between the cylinder and the dish is called the knuckle. The knuckle has a toroidal shape. The most common types of torispherical heads are:
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- Klöpper head
- This is a torispherical head. The dish has a radius that equals the diameter of the cylinder it is attached to . The knuckle has a radius that equals a tenth of the diameter of the cylinder, hence its alternative designation "Decimal head".
Also other sizes are:, rest of height (lets say ) .
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- Korbbogen head
- This is a torispherical head also named Semi ellipsoidal head (According to DIN 28013). The radius of the dish is 80% of the diameter of the cylinder . The radius of the knuckle is .
Also other sizes are:, rest of height (lets say ) . This shape finds its origin in architecture.
- Flat head
- This is a head consisting of a toroidal knuckle connecting to a flat plate. This type of head is typically used for the bottom of cookware.
- Diffuser head
- This type of head is often found on the bottom of aerosol spray cans. It is an inverted torispherical head.
- Conical head
- This is a cone-shaped head.
Read more about this topic: Head (vessel)
Famous quotes containing the word shapes:
“The chess pieces are the block alphabet which shapes thoughts; and these thoughts, although making a visual design on the chess-board, express their beauty abstractly, like a poem.... I have come to the personal conclusion that while all artists are not chess players, all chess players are artists.”
—Marcel Duchamp (1887–1968)
“Painting dissolves the forms at its command, or tends to; it melts them into color. Drawing, on the other hand, goes about resolving forms, giving edge and essence to things. To see shapes clearly, one outlines them—whether on paper or in the mind. Therefore, Michelangelo, a profoundly cultivated man, called drawing the basis of all knowledge whatsoever.”
—Alexander Eliot (b. 1919)
“The freedom of indifference, the indifference of freedom, the will dust in the dust of its object, the act a handful of sand let fall—these were some of the shapes he had sighted, sunset landfall after many days.”
—Samuel Beckett (1906–1989)