Head manufacturer's analysis of different pro

Head manufacturer's analysis of different products

The head is the main pressure element of boiler and pressure vessel, its structure and shape design is reasonable, the pressure vessel use is stable, low price, long service life.

Head is convex head of boiler, pressure vessel ellipsoid head, standard ellipsoid head (Dn/HN = 4). When non-standard ellipsoid head is selected, the ratio of its long and short axes should not be greater than 2.5.

A disc head is a rounded head with a fold. It has a large bending stress, while ellipsoidal head is mainly membrane stress, so it is not ideal in engineering. When disc head is selected, the radius of transition zone corner of head should not be less than 10% of the inner diameter of head, and not less than 3 times of the thickness of head, and the inner radius of ball surface of head should not be greater than the inner diameter of head.

Without ruffled spherical head frilled spherical head and cylinder of cohesion, the shape of the obvious mutations in larger happens additional bending stress, and therefore applies only to small diameter and low pressure container. When choosing a non-flanged spherical head, the inner radius of the spherical head should not be greater than the inner diameter of the cylinder.

Conical head The conical head is superior to the plate cover and should only be used when the production process of the container really requires it. The half-cone Angle of unflanged conical head shall not be greater than 30°. When the half cone Angle is greater than 30°, a conical head with a flanged edge should be selected, and the radius of the flanged transition zone should be no less than 10% of the inner diameter of the cylinder, and no less than 3 times the thickness of the cone.

Plate cover Plate cover is less stressed than other heads and is much thicker than other heads under the same compression conditions. Therefore, except the plate cover of reasonable structure for boiler container, the plate fillet welding head is generally not suitable for pressure vessels. When necessary, the thickness should be satisfied, and the welding structure of full penetration should be selected.

The axial section of spherical head shell is semicircle, and the shape of hemispherical head, spherical crown, trapezoidal ball and barrel is. The smaller diameter of the