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ASME SA516 GR.70 DISH HEAD HEMISPHERICAL ELLIPTICAL DISHED END TANK HEAD
An elliptical head refers to a head consisting of a half elliptical shell and a straight edge (cylindrical short section). Since the radius of curvature of the elliptic curve changes continuously, the elliptical shell is only subjected to the stress of the bovine film in its entirety, and the discontinuous stress is small due to the common tangent line at the joint between the elliptical shell and the straight side. A standard elliptical head with a ratio of long and short axes equal to 2, the edge stress at the junction of the elliptical shell and the straight edge is small and may be disregarded.
It consists of a semi-elliptical spherical surface and a straight cylindrical section. It absorbs the advantages of the hemispherical head and the shallow depth of the disc-shaped head. Since the curvature of the elliptical part is smooth and continuous, the stress distribution in the head is relatively uniform. The depth BT of the elliptical head depends on the length of the ellipse and the ratio of the minor axis, ie the inner diameter of the head I): twice the depth of the head The large size (IJ, I2H), the smaller the ratio, the seal. The greater the depth of the head, the thinner the wall is, but the processing is difficult; the higher the ratio, the smaller the depth of the head, making it easy to manufacture.
1. Hemispherical
Hemispherical head is made in form of half-sphere and technically
is the ideal shape for a vessel head. This is because forces are
spread out equally across the head. The radius of the hemisphere is
constant as opposed to an elliptical head. The radius is equal the
the radius of the shell that it attached to.
2. Elliptical (2:1)
Also known as an ellipsoidal head and is the most common type of
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.
3. Torispherical
These heads are sometimes referred to as flanged and dished heads
after the manufacturing process. The geometry of the head is
composed of the crown or dish radius, the major portion of the
head. The dish radius is a fixed radius whose size id dependant on
the type of head. The knuckle radius is the radius to the outer
edge. This type of head has good drainage when used in the vertical
position.
4. Conical
Conical heads possess more inherent strength than flat heads.
Conical bottoms, depending on the angle of the cone, provide
excellent bottom drainage. Placing a nozzle at the bottom of a
conical head will allow for solids and precipitate to immediately
get flushed out. The ASME code limits conical heads without a
knuckle radius to a maximum included half angle of 30 degrees. The
conical angle is specified differently depending on the
manufacturer, some specify the included angle while others the
angle of the cone in reference to the tangent line of the head.
5. Flat
This is a head consisting of a toroidal knuckle connecting to a
flat plate. This type of head typically is not used on pressure
vessels since it is inherently very weak. But sometimes they are
used in form of welded cap to cap configuration for making external
thick wall expansion joints.
Products | Torispherical Head, Ellipsoidal Head, Dished Head, Hemispherical Head |
Material | Stainless Steel, Carbon Steel |
Surface Treatment | Natural Color , Sandblasting , Mirror Polishing , Acid Pickling, Etc |
Connection | Butt-Welding |
Application | Such As Fire Pit , Oil, Chemical Industry, Water Conservancy, Electric Power, Boiler, Machinery, Metallurgy, Sanitary Construction Etc. |
Technology | Hot Pressing , Cold Pressing |
Packing | Wooden Cases ,Wooden Pallet Plastic Bag Or As Per Customers Requirement |
Composition | Percentage % | Composition |
C | 0.10/ 0.22 | Cu |
Si | 0.6 | Ni |
Mn | 1/ 1.7 | Mo |
P | 0.03 | Nb |
S | 0.03 | Ti |
Al | 0.02 | V |
Cr | 0.3 |
Properties | Value |
Tensile Strength (N/mm2) | 510/ 650 |
Yield stress/ min (N/mm2) | 335 |