Introduction of different head products

Introduction of different head products

Do you know anything about head fitting? How much do we know? The following is a brief introduction of our company's analysis of the unsealed pipe fittings:

Introduction to Head products:

Ellipsoid head The convex head of boiler and pressure vessel should be ellipsoid head, the standard ellipsoid (Dn/HN = 4). When non-standard ellipsoid head is used, the ratio of its major axis to major axis shall not be greater than 2.5.

The introduction of the disc head: the disc head is a spherical head with a hem. It has a large bending stress, while the ellipsoidal head mainly has membrane stress, so it is not ideal in engineering use. When the disc head is used, the corner radius of the transition area of the head shall not be less than 10% of the inner diameter of the head, and not less than 3 times of the thickness of the head, and the inner radius of the ball surface of the head shall not be greater than the inner diameter of the head.

There is obvious shape mutation at the joint of the spherical head without hem and the cylinder, which will produce large additional bending stress. Therefore, it is only used for containers with smaller diameter and lower pressure. The radius of the inner sphere of the head shall not be larger than the inner diameter of the cylinder when the head without hem is used.

Conical head Conical head: The force of conical head is better than that of flat cover, it is only used in the case that the production process of the container really needs. The half cone Angle of non - hem conical head shall not be greater than 30°. When the semi-cone Angle is greater than 30°, a conical head with hem should be used, and the radius of the hem transition zone in the corner should not be less than 10% of the diameter of the cylinder body, and should not be less than 3 times of the th